id stringlengths 12 12 | format stringclasses 2 values | title_ko stringlengths 0 811 ⌀ | title_en stringlengths 0 1.26k ⌀ | journal dict | authors listlengths 0 15 | abstract_ko stringlengths 0 4k ⌀ | abstract_en stringclasses 100 values | keywords stringclasses 157 values | citation_count stringclasses 5 values | doi stringlengths 0 127 ⌀ | url stringclasses 101 values | file_source stringlengths 23 23 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
ART001128157 | oai_dc | Visualization of 3-D digital elevation model for landslide assessment and prediction in mountainous terrain: A case study of Chandmari landslide, Sikkim, eastern Himalayas | Visualization of 3-D digital elevation model for landslide assessment and prediction in mountainous terrain: A case study of Chandmari landslide, Sikkim, eastern Himalayas | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Chandra Shekhar Dubey(University of Delhi, India); Manoj Chaudhry(University of Delhi, India); Braj Kishore Sharma(University of Delhi, India); Arvind Chandra Pandey(Haryana Remote Sensing Agency, India); Bhoop Singh(Technology Bhawan, India)"
] | Techniques for recognizing and mapping of land-slides are complex in mountainous terrains. Most of the methodsapplied to landslide identification and prediction involves assign-ment of different contributing factors in landslide hazard zonation;digital elevation modeling capabilities and Guided Visual Program(GVP) module of Datamine Software is utilized to successfullyenumerate the various contributing factors for causing the land-slide in Sikim, Eastern Himalaya in the case study of ChandmariLandslide. A landslide warning system is discussed for the site-specific Chandmari landslide area. | 지질학 | null | kci_detailed_000237.xml | |||
ART000983791 | oai_dc | Applicable range of the Reynolds equation for fluid flow in a rock fracture | Applicable range of the Reynolds equation for fluid flow in a rock fracture | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"In Wook Yeo(Chonnam National University); Shemin Ge(University of Colorado, Boulder, USA)"
] | The applicability of the Reynolds equation to fluidflow in rock fractures has recently been questioned. One issue isthat the Reynolds equation overestimates the transmissivity forrough fractures. Another issue is to delineate the range of fractureroughness over which the Reynolds equation is reasonably accu-rate. In this paper, the analysis was undertaken to examine therelationship between fracture geometry and the accuracy of theparameter, (bm/Λ)(A/Λ), where bm/Λ is the ratio of mean apertureto wavelength, representing roughness, and A/Λ is the ratio ofamplitude of oscilated fracture roughness to the wavelength, rep-resenting tortuosity. We found that when (bm/Λ)(A/Λ) is less than0.01, the Reynolds equation may yield accurate transmissivity pre-dictions. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128059 | oai_dc | Abrupt increase of calcium carbonate contents in the Campbell Plateau (SW Pacific Ocean) during the deglaciation | Abrupt increase of calcium carbonate contents in the Campbell Plateau (SW Pacific Ocean) during the deglaciation | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김부근(부산대학교); 이영주(한국지질자원연구원)"
] | A core taken from a mudline of Hole 1120A (ODPLeg 181) located in the Campbell Plateau, Southwest PacificOcean documents the deglacial variation of calcium carbonatecontents. Stable isotope profiles of planktonic and benthic fora-minifera and a radiocarbon AMS dating (11,260 ka) constrain theage of deglaciation. Abrupt increase in the calcium carbonate con-tents during the deglaciation is a result of complex combination ofdissolution, production, and dilution. Dissolution of bottom waterplays insignificant role in Site 1120 due to the bathymetric highsite above the present lysocline. The reduction in dilution of non-carbonate terrigenous particles is considered as a major reason toshow the enhanced calcium carbonate contents during the Holocene.Such chalk-marl cycle of Atlantic-type carbonate variation can beobserved in the Southwest Pacific Ocean. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128209 | oai_dc | Facies distribution patterns and environment reconstruction of the upper member of the L？ncara Formation in the Somiedo-Correcilla unit | Facies distribution patterns and environment reconstruction of the upper member of the L？ncara Formation in the Somiedo-Correcilla unit | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Thomas Wotte(Freiberg University of Mining and Technology, Germany)"
] | The microfauna of the upper member of the Ln-cara Formation in the Somiedo-Correcilla unit (LowerMiddleCambrian, Cantabrian zone, northwestern Spain) is described indetail and discussed in respect to biofacies and palaeoecology. Thestudy of about ons allows to reconstruct a sedimen-tological model based on bio- and lithofacial trends. A vertical fau-nal differentiation is detected in the three studied outcrops. Thebase of the upper member of the Lncara Formation (Beleo facies)is characterised by a high amount of sessile suspension feeders(echinoderms) which indicate a low or absent siliciclastic influx.The amount of trilobites (mobile deposit feeders) and sessile filterfeeders (brachiopods) is clearly lower. This echinoderm-rich faciescharacterises the lower few meters and is called Faunal AssemblageA. The transition to Faunal Assemblage B is characterised by aincrease in percentage. This evolution continues in “Faunal Assem-blage C”, which is dominated by mobile suspension- and sessile fil-ter-feeders. The continuous lithological and faunal succession, butoverall low faunal and facial gradients of the upper member of theLncara Formation are representative for a ramp environment.The deposition is interpreted as a turnover from an eastward-tiltedhomoclinal carbonate ramp (lower member of the Lncara For-mation) to a mixed carbonate-siliciclastic ramp (Beleo and Bar-rios facies, respectively Faunal Assemblages A, B, C, D). Theabrupt appearance of the Faunal Assemblage A points to a suddenclastic content is accompanied with a successive change in the fau-nal composition from a fauna dominated by sessil suspensionfeeders to a mobile deposit feeder-dominated one. The increase ofsiliciclastic material indicates a more or les constant rise of sea-level that caused an onshore shift of the facies belts, and mirrorsthe general drowning of the ramp. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128110 | oai_dc | Textural and geochemical characteristics of Fe-Mn crusts from four seamounts near the Marshall Islands, western Pacific | Textural and geochemical characteristics of Fe-Mn crusts from four seamounts near the Marshall Islands, western Pacific | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Jonguk Kim(KORDI); Kiseong Hyeong(KORDI); Chan Min Yoo(KORDI); Jai-Woon Moon(KORDI); Ki-Hyune Kim(KORDI); Young-Tak Ko(KORDI); Insung Lee(Seoul National Univeristy)"
] | Textural and geochemical properties of ferroman-ganese crust (Fe-Mn crust) samples from four adjacent seamountsnear the Marshall Islands were investigated to delineate the pale-oceanographic condition on their growth history. The Fe-Mn crustsamples of this study show four distinct layers (layers 1 to 4 fromtop to bottom). The uppermost layer 1 is massive and black, andis enriched in hydrogenetic elements such as Mn, Co, Ni, and Mo.The next layer 2 is porous and filled with sediment. Detrital (Al,Rb, and Ti) and biogenic (Cu, Zn, and Ba) elements are enrichedin layer 2. The layers 3 and 4 are phosphatized layers which areimpregnated with carbonate fluorapatite (CFA), and thereforetheir primary mineralogy and geochemistry were not preserved.The property of layer 2 suggested that this layer had grown underthe condition of high biogenic and detrital flux. Such a conditionmay be met in the Inter-tropical Convergence Zone (ITCZ) wherethe northeast and southeast trade winds met. Considering thehave formed when these seamounts were beneath the ITCZ. On theother hand, layer 1 may have started to grow after the seamountsmoved out of the ITCZ with the northwestward movement of thePacific plate. Our study indicates that the Fe-Mn crusts can beused to trace the paleolocation of ITCZ when precise age determi-nation and information on the plate movement are provided. | 지질학 | null | kci_detailed_000237.xml | |||
ART000983790 | oai_dc | Sequence stratigraphy of the cyclic successions in the Dumugol Formation (Lower Ordovician), mideast Korea | Sequence stratigraphy of the cyclic successions in the Dumugol Formation (Lower Ordovician), mideast Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Yi Kyun Kwon(서울대학교); Sung Kwun Chough(서울대학교)"
] | 지질학 | null | kci_detailed_000237.xml | ||||
ART001128158 | oai_dc | Engineering geological zonation using interaction matrix of geological factors: An example from one section of Sichuan-Tibet Highway | Engineering geological zonation using interaction matrix of geological factors: An example from one section of Sichuan-Tibet Highway | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Yanjun Shang(Chinese Academy of Sciences, China); Hyeong-Dong Park(서울대학교); Zhifa Yang(Chinese Academy of Sciences, China)"
] | 지질학 | null | kci_detailed_000237.xml | ||||
ART000984048 | oai_dc | Geodetic datum transformation to the global geocentric datum for seas and islands around Korea | Geodetic datum transformation to the global geocentric datum for seas and islands around Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Jay Hyoun Kwon(The University of Seoul); 배태석(The Ohio State University); 최윤수(서울시립대학교); 이동천(세종대학교); 이용욱(대한측량협회)"
] | According to revisions of survey law taking effect onJanuary 1, 2003, the Korean geodetic datum has been changedfrom a local geodetic to a world geodetic system. Since the datumchange demands a geographical data transformation, the NationalGeographic Information Institute has established step-by-stepplans for the transformation of the land data constructed throughthe National GIS Project, and it is in progress. For maritime data,Therefore, it is necessary to analyze the maritime geographic dataobtained through the Maritime GIS project and set up the datatransformation scheme to a world geodetic system. In this study,the datum transformation parameters especially for the maritimegeographical data are determined. From database constructedthrough MGIS, a total of 492 coordinate pairs were used in param-eter determination initially. At this stage, thre popular seven param-eter transformation models, Bursa-Wolf, Molodensky and Veismodel, and the multi regression equation are applied, and the trans-formation parameters from the Molodensky model are selected formethod. To eliminate the local bias caused by the nonequally dis-tributed stations, a network optimization is applied and 42 stationsare selected to determine the final transformation parameters.The distortion after applying the similarity transformation is mod-eled through a least squares collocation with Gaussian model, andhigh accuracy better than 15 cm in coordinate transformation isobtained. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128111 | oai_dc | Changes of permeability characteristics dependent on damage process in granites | Changes of permeability characteristics dependent on damage process in granites | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Byung-Gon Chae(KIGAM); 정교철(Andong National University); Hak-Joon Kim(Daejeon University); Jae-Hyeon Park(Inje University); Takafumi Seiki(Utsunomiya University, Japan)"
] | Fracture properties are closely related to the per-meability characteristics of massive crystalline rocks. In order tounderstand the changes of rock permeability related to the dam-age process, this study performed characterization on changes ofhydraulic properties with both in-situ tests and laboratory tests.The results of in-situ tests showed that permeability coefficientsThe differences are related to the conditions of fracture distribu-tion due to rock damage in the process of tunneling. This studyperformed uniaxial compressive tests (UCT) and water injectiontests in order to understand the relationship between the damageprocess and changes of permeability characteristics by the labo-ratory tests. Crack distribution on each damage grade wasobserved by the acetate peel. According to the results of the tests,the strongly damaged specimens with crack length density of morethan 0.6 cm-1 showed higher values of permeability coefficientsimens have persistent cracks and good connectivity throughoutthe rock specimens. It indicates that rock damage influences onthe permeability characteristics in rocks. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128058 | oai_dc | Relative role of productivity vs. stagnation in dark laminated mud formation during the last 25,000 years in the Ulleung Basin, East/Japan Sea | Relative role of productivity vs. stagnation in dark laminated mud formation during the last 25,000 years in the Ulleung Basin, East/Japan Sea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박장준(한국지질자원연구원); Kyung Eun Lee(Korea Maritime University); Sung Kwun Chough(서울대학교)"
] | Records of redox-sensitive elements (Mo, Cd, Cu, Vand U), δ18O of planktonic foraminifera (δ18Opf), and organic car-bon and biogenic opal contents in dark laminated mud (DLM)layers of the East/Japan Sea reveal relative role of primary pro-ductivity versus bottom-water stagnation for the formation ofthese layers during the last 25,000 years. Enrichments of redox-sensitive elements in these layers indicate that bottom waters werereduced during the formation of the lower DLM (22,500-15,00014C yr B.P.) and the upper DLM (10,400-10,200 14C yr B.P.), prob-ably to a greater extent in the lower layer. Anomalous low δ18Opfvalues and minimal contents of both organic carbon and biogenicopal suggest that bottom-water stagnation due to density-stratifiedwater column could be more important than primary productivityfor the lower DLM formation. In contrast, the relatively high con-tents of the organic carbon in the upper DLM invoke a primaryrole of enhanced productivity in the formation. This inference is,however, questioned by the absence of comparable increase in bio-genic opal contents which is expected from generally coupled pro-duction of organic carbon and opal in surface water. The discrepancybetween the organic carbon and opal records suggests that a bot-tom-water stagnation, which might have caused the preferentialpreservation of organic carbon in the reducing bottom-water con-dition, could be also more important than primary productivityfor the upper DLM formation. | 지질학 | null | kci_detailed_000237.xml | |||
ART000996268 | oai_dc | Gallionella Ferruginea in ochreous precipitates from acid mine draninage in Donghae coal mine area, Korea | Gallionella Ferruginea in ochreous precipitates from acid mine draninage in Donghae coal mine area, Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"JeongJin Kim(서울대학교); SooJin Kim(서울대학교); SangSoo Lee(서울대학교)"
] | The morphology of Gallionella ferruginea and othermicroorganisms in the ochreous precipitates in acid mine drainage(AMD) were investigated using a scanning electron microscope(SEM) equipped with energy dispersive spectrometry (EDS). Min-eralogy of the precipitate containing the microorganism was char-Galionella ferrugineahaving twisted structure are found from precipitate samples onthe stream bottom in AMD. Other microorganisms, characterizedby coccus, bacillus, rod or cylindrical forms, are also observed inthe precipitates. The ochreous preciptate was appeared reddishbrown color (Munsell color 3.5YR hues) and consisted mainly offerrihydrite with minor goethite. | 지질학 | null | kci_detailed_000237.xml | |||
ART000996697 | oai_dc | Rock type classification by multi-band TIR of ASTER | Rock type classification by multi-band TIR of ASTER | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Hiroshi Watanabe(Earth Remote Sensing Data Analysis Center); Kazuaki Matsuo(MC Exploration Co.,Ltd)"
] | The ASTER TIR (thermal infrared radiometer)sensor has 5 spectral bands over 8 to 12 mm region. Rock type clas-sification using the ASTER TIR nighttime data was performed inthe Erta Ale range of the Ethiopian Rift Valley. Erta Ale range isthe most important axial volcanic chain of the Afar region. Thepetrographic diversity of lava erupted in this area is very impor-tant, ranging from magnesian transitional basalt to rhyolites. Wetried to classify the rock types based on the spectral behavior of eachvolcanic rock types in thermal infrared range and estimated SiO2content with emission data by the ASTER TIR. The associated VNIRand digital terrain model (DTM) derived from the stereo pair in thesame data set provided a consistent result with that from TIR. | 지질학 | null | kci_detailed_000237.xml | |||
ART001195764 | oai_dc | Application of cluster analysis for the hydrogeochemical factors of saline groundwater in Kimje, Korea | Application of cluster analysis for the hydrogeochemical factors of saline groundwater in Kimje, Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김지훈(Korea Institute of Geoscience and Mineral Resources); Byoung-Woo Yum(Korea Institute of Geoscience and Mineral Resources); 김락현(서울대학교); 고동찬(Korea Institute of Geoscience and Mineral Resources); Tae-Jin Cheong(Korea Institute of Geoscience and Mineral Resources); Jeongho Lee(Korea Environment Institute)"
] | Park, Y.S., Kim, J.K. and Kim, J., 201, Petrochemistry of Granitoids322 Ji-Hoon Kim, Byoung-Wo Yum, Rak-Hyeon Kim, Dong-Chan Koh, Tae-Jin Cheong, Jeongho Lee and Ho-Wan Changin the Youngwang-Kimje area, Korea. Economic and Environ-mental Geology, 34, 55-70 (in Korean with English abstract).Price, B.N. and Calvert, S.E., 1977, The contrasting geochemicalbehaviors of iodine and bromine in resent sediments from theNambian Shelf. Geochimica et Cosmochimica Acta, 41, 1769-1775.Richter, B.C., Kreitler, C.W. and Bledsoe, B.E., 1993, Geochemicaltechniques of identifying sources for groundwater salinization.CRC Pres, New York, 285 p.Stumm, W. and Morgan, J.J., 196, Aquatic chemistry: chemicalequilibria and rates in natural waters. 3rd edn. Wiley, New York,1022 p. | 지질학 | null | kci_detailed_000237.xml | |||
ART000926884 | oai_dc | High-frequency magnetotelluric data of tidal deposits: Gomso Bay, southwest coast of Korea | High-frequency magnetotelluric data of tidal deposits: Gomso Bay, southwest coast of Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"WooHun Ryang(Chonbuk National University); Howoong Shon(Paichai University)"
] | A novel high-resolution high-frequency range mag-netotelluric (HFMT) survey was conducted to image an intertidalsuccession in a macrotidal environment. In Gomso Bay of thesouthwestern coast of Korea, HFMT data were colected on a line(~1 km) comprising 21 recording sites at 50 m intervals. A two-dimensional section was constructed from the transverse magnetic(TM) mode, inspected by electromagnetic array profiling (EMAP)filtering and one-dimensional Bostick inversion. The image isdemarked by two distinct discontinuities. The lower one is inter-preted as a boundary betwen the basement of high resistivity andthe overlying tidal deposits of low resistivity. The upper one isexpected to be a significant layer of relatively high resistivity withinlow resistivity deposits. This is suggestive of nonmarine/tidal strataexperiencing prolonged subaerial exposures within tidal successions.In a tidal-flat environment, the HFMT probing seems to effectivelyconfigure boundaries betwen the basement and sucesions ofdifferent physical properties. | 지질학 | null | kci_detailed_000237.xml | |||
ART000899823 | oai_dc | Geostatistical integration of spectral and spatial information for land-cover mapping using remote sensing data | Geostatistical integration of spectral and spatial information for land-cover mapping using remote sensing data | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박노욱(한국지질자원연구원); 지광훈(한국지질자원연구원); 권병두(서울대학교)"
] | A geostatistical contextual classifier for land-covermapping using remote sensing data is presented. To integrate spa-tial information with spectral information derived from remotesensing data, a geostatistical indicator approach is adopted todetermine the probability of a certain land-cover class occuring atan unsampled location given that any other land-cover classesoccur at neighboring locations. The geostatistical indicator algo-rithm applied here is simple indicator kriging with local means.This approach can directly integrate both spatial information ofground data (hard data) and spectral information of remote sens-ing data (soft data) within an indicator kriging framework. Thisalgorithm is applied to the classification of multi-sensor remotesensing data for land-cover mapping. This classification result iscompared with a result obtained from a conventional spectralinformation based classification method. | 지질학 | null | kci_detailed_000237.xml | |||
ART001195765 | oai_dc | A structure-controlled model for hot spring exploration in Taiwan by remote sensing | A structure-controlled model for hot spring exploration in Taiwan by remote sensing | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Jin-King Liu(Enegry and Resources Laboratories); Ming-Fang Yu(Industrial Technology Reserch Institute); Shiun-Jenq Ueng(Hazard Mitigation Laboratory)"
] | Hot Spring Law of Taiwan was passed in legislativeassembly on 3 June 2003. Hot springs would become one of themost important natural resources for recreation purposes. Bothpublic and private sectors wil invest large amount of capital inthis area in the near future. The value of remote sensing technol-ogy is to give a critical tool for observing the landscape to find outmega-scaled geological structures, which may not be able to befound by conventional approaches. The occurrences of the hotsprings in Taiwan are mostly in metamorphic and sedimentaryrocks, other than in volcanic environments. Local geothermalanomaly or heat of springs transfer by liquid convection otherthan conduction or radiation. The deeply-seated fractures of hardrocks are the conduit of the convection of hot water, which couldbe as deep as 3000 meters in a hypothetical model of Taiwan.Clues to find outcrops of hot spring can be obtained by a struc-ture-controlled model deduced by geological lineaments observedby satellite images and stereoscopic interpretation of aerial pho-tographs. A case study conducted in Eastern Taiwan wil be dem-onstrated. | 지질학 | null | kci_detailed_000237.xml | |||
ART000926918 | oai_dc | Geochemistry of Rewalsar Lake sediment, Lesser Himalaya,India: implications for source-area weathering, provernance and tectonic setting | Geochemistry of Rewalsar Lake sediment, Lesser Himalaya,India: implications for source-area weathering, provernance and tectonic setting | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"BrijrajK. Das(Panjab University); Birgit-Gaye Haake(University of Hamburg)"
] | 지질학 | null | kci_detailed_000237.xml | ||||
ART000997118 | oai_dc | Enhancing Landsat TM to update the structural analysis of the Mirs Bay Basin, Hong Kong, China | Enhancing Landsat TM to update the structural analysis of the Mirs Bay Basin, Hong Kong, China | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Ka.F. Leung(University of Hong Kong); VijayK. Vohora(University of Hong Kong); LungS. Chan(University of Hong Kong); JohnG. Malpas(University of Hong Kong)"
] | The coastal provinces of South China have beenuniquely shaped by various tectonic events. During the mid-lateMesozoic tectono-thermal event, the oblique subduction of thePaleo Kula-Pacific plate beneath the Eurasian plate has created acomplicated tectonic setting for the whole region. However, thepaper, we discuss the advantages of using LANDSAT TM satelliteimagery over a small part of the region - the Mirs Bay Basinwhich is largely covered by dense vegetation and where limitedoutcrops is seen. The use of satellite imagery complements fieldmapping and the result shows a prominent sinistral offset alongthe eastern margin of the Mirs Bay Basin, which was not previ-ously recognized on the ground. | 지질학 | null | kci_detailed_000237.xml | |||
ART000996696 | oai_dc | A Study on surface temperature patterns in the Tokyo Metropolitan area using ASTER data | A Study on surface temperature patterns in the Tokyo Metropolitan area using ASTER data | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Yuko Fukui(Earth Remote Sensing Data Analysis Center)"
] | This study reports the surface temperature patternsof the Tokyo Metropolitan area using ASTER surface temperatureproducts. The product is an image processed by applying temper-ature-emissivity separation to atmospherically corrected infraredthermal radiance of the land surface, then converted to surface tem-perature by using Plancks function. Daytime and nighttimeobservation in a cold season and a warm season were used in thisstudy. As the result, 1) contrast between urban and suburban areas, 2)extraction of heating areas in urban area, 3) measurement of cool-ing effect of green space were achieved. | 지질학 | null | kci_detailed_000237.xml | |||
ART000996695 | oai_dc | Hydrogeological survey and satellite remote sensing in the Dunhuang area | Hydrogeological survey and satellite remote sensing in the Dunhuang area | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Chunze Piao(Osaka University); Chilaosa Tanimoto(Osaka University); Keigo Koizumi(Osaka University); Zuixiong Li(Dunhuang Academy); Xudong Wang(Dunhuang Academy); Qinglin Guo(Dunhunag Academy)"
] | Mogao Grottos are located at the eastern foot of theMingsha Mountain, 25 km southeast of Dunhuang City. The caveswere excavated into the clif on the west bank of the DaquanRiver. The wall paintings in the caves are subject to the severedeterioration generated by recrystallization of salt. It relates withthe movement of water/moisture in rock formation. Through thesatellite image analysis and geological survey, it has been clarifiedthat the movement of ground water is governed by the fault sys-tem. The geographical nature is specified by the aggressive tec-tonic movement from the south. | 지질학 | null | kci_detailed_000237.xml | |||
ART000926684 | oai_dc | Biomineralization of a poorly crystalline Fe(III)oxide, akaganeite, by an anaerobic Fe(III)-reducing bacterium (Shewanella alga)isolated from marine environment | Biomineralization of a poorly crystalline Fe(III)oxide, akaganeite, by an anaerobic Fe(III)-reducing bacterium (Shewanella alga)isolated from marine environment | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"SangHan Lee(서울대학교); Insung Lee(서울대학교); Yul Roh(Oak Ridge National Laboratory)"
] | Formation of Fe(II)-containing mineral throughmicrobial processes may play an important role in iron and car-bon geochemistry in subsurface environments. Fe(III)-reducingbacteria form Fe(II)-containing minerals such as siderite, magne-tite, vivianite, and green rust using iron oxides. A psychrotolerantFe(III)-reducing bacterium, Shewanella alga (PV-4), was used toexamine the reduction and biomineralization of a poorly crystal-line iron oxide, akaganeite (b-FeOOH), in the absence of a solubleelectron shuttle, anthraquinone disulphonate (AQDS), under dif-ferent atmospheric compositions as well as in HCO3- bufferedmedium (30 to 210 mM). Iron biomineralization was also exam-ined under different growth conditions such as incubation time,electron donors, and electron acceptors. The Fe(III)-reducing bac-terium, PV-4, reduced akaganeite, Fe(III)-citrate, and Co(III)-EDTA using lactate or H2 as an electron donor. The iron biomin-eralization of Fe(III) oxide, akaganeite-as it undergos reductionby an iron reducing bacterium-is a complex process influenced bybiogeochemical factors including microorganisms, bicarbonatebuffer concentration, atmospheric composition, electron donors/acceptors, incubation time, and Eh/pH. From this research wefound that microorganisms do participate in the formation ofdiverse iron minerals and that microbial iron biomineralizationmay affect Fe and C biogeochemistry in subsurface environments. | 지질학 | null | kci_detailed_000237.xml | |||
ART000899820 | oai_dc | Study on the exchange reaction of HDTMA with the inorganic cations in reference montmorillonties | Study on the exchange reaction of HDTMA with the inorganic cations in reference montmorillonties | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"SeungYeop Lee(서울대학교); SooJin Kim(서울대학교)"
] | The adsorption of hexadecyltrimethylamonium(HDTMA) cations on swelling layer silicates (montmorilonites)was studied by adsorption isotherms, X-ray diffraction, and electronmicroscopy. At low HDTMA concentrations, HDTMA ions startedto be adsorbed on interlayer sites of SWy montmorilonite, causinga preferential release of interlayer Na+ compared with Ca2+, whilethe lateral attraction betwen adsorbed HDTMA cations at edges orexternal surfaces highly prevailed in SAz montmorillonite. Mont-morilonite clay surfaces appeared as foliated and iregular aggre-gate structures at high HDTMA loadings. Besides the clay surfacecharge, the interlayer inorganic cations appeared to have a sub-stantial influence on the expansion behavior of silicate layers aswell as the evolution of the surface aggregates as a function ofHDTMA surface coverage. | 지질학 | null | kci_detailed_000237.xml | |||
ART001197778 | oai_dc | Meso-Neoproterozoic bacterial microfossils from the Sukhaya Tunguska Formation of the Turukhansk Uplift, Russia | Meso-Neoproterozoic bacterial microfossils from the Sukhaya Tunguska Formation of the Turukhansk Uplift, Russia | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Soo-yeun Ahn(Kyungpook National University); Seong-Joo Lee(Kyungpook National University)"
] | The stratiform stromatolitic cherts from the Meso-Neoproterozoic Sukhaya Tunguska Formation (ca. 1,100-900 Ma)of the Turukhansk Uplift, Russia, preserve an abundant and var-ied record of ancient microbial life. The assemblages found in thesilicified stratiform stromatolites are dominantly composed of emptysheaths of filamentous bacteria and envelopes of coccoid ones, most ofwhich are interpreted as ancient cyanobacterial remains. Three fil-amentous species (Siphonophycus kestron, S. inornatum, S. robus-tum) belonging a single genus were identified, while five coccoidspecies belonging to 3 genera (Glenobotrydion aenigmatis, Gloeo-diniopsis lamelosa, G. sp., Myxococcoides grandis, M. minor, Eoen-tophysalis sp.) were documented. | 지질학 | null | kci_detailed_000237.xml | |||
ART000926683 | oai_dc | Framboidal pyrites in late Quaternary core sediments of the East Sea and their paleoenvironmental implications | Framboidal pyrites in late Quaternary core sediments of the East Sea and their paleoenvironmental implications | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Myong-Ho Park(Yonsei University); Il-Soo Kim(Yonsei University); Byong-Jae Ryu(Korea Institute of Geoscience and Mineral Resources)"
] | The three piston cores, collected from the East Sea,were analyzed to detect changes of sedimentary environment dur-ing the late Quaternary. The cores consist mainly of muddy sed-iments that are interbedded with silty sands, lapili and ash layers.The so-called dark laminated mud (DLM) layers are found duringthe last-glacial and interglacial transition. The geochemical resultsdocument that the DLM layers are enriched in Fe relative to Mn.Fe is present as a form of framboidal pyrite, which shows a pro-portion of about 2:1 for S and Fe. Based on the morphology, the pyritesare regarded to have grown in the transitional state between highand low supersaturations of Fe and S. Furthermore, the framboi-dal size distribution implies that the DLM layers have deposited ineuxinic environments. | 지질학 | null | kci_detailed_000237.xml | |||
ART000899821 | oai_dc | Contrasting basin fills in a strike-slip setting, Eumsung Basin(Cretaceous), Korea | Contrasting basin fills in a strike-slip setting, Eumsung Basin(Cretaceous), Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Ryang, W.H(Chonbuk National University)"
] | In a strike-slip setting, depositional history of mar-ginal and central basins depends on the basin formation and basi-nal fault movements. The Eumsung Basin contains contrastingbasin fils according to marginal setings. The southeastern part ofthe basin forms sequential development of alluvial/lacustrine sys-tems along transform margin, and the southwestern part consti-tutes synchronous development of alluvial-to-lacustrine systems inpull-apart margin. Along the basin margins and toward the basincenter, both sequential and synchronous developments of the allu-vial and lacustrine systems have filed basinal accommodationspaces created by pull-apart opening. The formative processes ofthe basin were caused by the strike-slip fault movements and theaccompanying changes in drainage network along the basin mar-gin. The overall development patterns of the depositional systemsconform to the sinistral strike-slip fault activation during theEarly Cretaceous. | 지질학 | null | kci_detailed_000237.xml | |||
ART000926874 | oai_dc | Development of GIS-based geological hazard information system and its application for landslide analysis in Korea | Development of GIS-based geological hazard information system and its application for landslide analysis in Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이사로(Korea Institute of Geoscience&Mineral Resources(KIGAM)); Ueechan Choi(Korea Institute of Geoscience&Mineral Resources)"
] | Techniques for geological hazard management, assess-ment and prediction must be developed for the prevention andmitigation of geological hazards. To enable this, data sets related togeological hazard prevention related must be constructed, analyzedand distributed to customers. For this, a spatial database (SDB)including geological hazards, basic maps, damageable objects, sat-ellite imagery, meteorological data and terrain analysis data wasconstructed using GIS, and to manage the SDB, a geological haz-ard information system (GHIS) was developed. The SDB is coveringmost area of South Korea and was formed at national, regionaland medium scales separately in the form of index and adminis-trative district unit. Using the GHIS, the SDB can be selectedaccording to scale, locality and diferent types of data, and can beedited and manipulated. For the application of the constructed SDB,landslide hazard was analyzed for the Janghung area, Korea.Landslide susceptibility was analyzed using the landslide-occur-rence factors by frequency ratio model. For the verification, theresult of the analysis was applied to study areas. The verificationresults showed satisfactory agreement between the susceptibilitymap and the existing data on landslide locations. | 지질학 | null | kci_detailed_000237.xml | |||
ART000899822 | oai_dc | Chemical weathering and climate-a global experiment: A review | Chemical weathering and climate-a global experiment: A review | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Youngsook Huh(Northwestern University)"
] | How has the Earth maintained a habitable environ-ment while its closest neighbors, Venus and Mars, are currentlytoo hot or too cold? This fortunate state has been attributed to anegative feedback hypothesis that has stood unchallenged foryears. In this model, any increase in atmospheric CO2 productionis balanced by increased CO2 uptake by silicate weathering undergreenhouse conditions. A decrease in atmospheric CO2, then, isbalanced by decreased silicate weathering rates under the colderclimate. A global experiment utilizing published geochemical datafrom large rivers at diferent latitudes helps us test the climatedependence of weathering, central to this hypothesis. When riversdraining granitic shields and basaltic provinces are compared, thereis no systematic latitudinal variation (temperature dependence) inthe rates of chemical weathering. At global scale the physicalmechanisms superimpose a threshold effect on the underlying cli-mate-dependence of silicate weathering. On tropical cratons, thebuildup of lateritic regolith suppresses weathering. In the arctic/subarctic, frost action efficiently removes the regolith and gener-ates physical exposure of silicate rocks to the weathering agents(water, CO2), thereby accelerating reaction. Available field obser-vations do not support the currently standard Clausius-Clapey-ron-Arrhenius model. | 지질학 | null | kci_detailed_000237.xml | |||
ART001197779 | oai_dc | Combined performance of pumping and tracer tests: A case study | Combined performance of pumping and tracer tests: A case study | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이진용(서울대학교); 김정우(서울대학교); 천정용(서울대학교); 이명재(서울대학교); 이강근(서울대학교)"
] | A combined pumping and tracer test was conducted at a highly fractured aquifer system. The hydrogeologic units underlying the test site are reclamation soil, weathered rock layer, and fractured layer. The fractured layer is the main aquifer for this site. Prior to pumping and tracer tests, slug tests were conducted at four test wells. The test data revealed existence of a low permeability zone near well OB-1. Generally the estimated hydraulic conductivities are in the order of 10-4 cm/sec. A pumping test with a discharge rate of 57 m3/d was performed for 1,230 min. The pumping test data analysis yielded coherent hydraulic conductivity values with those of the slug tests. However, the separate analysis for each monitoring well based on conventional analytical solutions with highly strict boundary conditions and homogeneity assumption cannot efficiently show the potential existence of the low permeability zone. During the pumping test, when the water levels of the pumping and monitoring wells are stabilized, a convergent radial tracer test was conducted. From the observed tracer concentration, a longitudinal dispersivity of 0.3 m was obtained, which is well consistent with the values in the prominent literature considering the test scale. This study excellently demonstrated a method completing a combined pumping and tracer test at one time. | 지질학 | null | kci_detailed_000237.xml | |||
ART000926875 | oai_dc | Two modes of clay-mineral dispersal pathways on the continetal shelves of the East Siberian Sea and western Chukchi Sea | Two modes of clay-mineral dispersal pathways on the continetal shelves of the East Siberian Sea and western Chukchi Sea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Boo-Keun Khim(Pusan National University)"
] | The distribution of clay-mineral abundances on theinner continental shelves of the East Siberian and western Chuk-chi Seas well confirms to the dominant regional circulation pattern.The clay mineralogical analysis distinctly shows the two principalsources and dispersal pathways of these clay-mineral assemblages.The latitudinal (i.e., depth dependence) and longitudinal (i.e., sourcedependence) transition between clay-mineral assemblages explainsthat the ilite-rich mineral assemblage derived largely from the KolymaRiver is likely transported along the inner continental shelf by theeastward-flowing Siberian Coastal Current in the East Siberian Sea.Another assemblage of smectite- and kaolinite-rich sediments mostlyderived ultimately from the Yukon River extends toward the LongStrait through the Bering Strait from the northern Bering Sea. Inadition, sensitive variations in the clay-mineral assemblages reflectthe association with water depth, which underscores the transpor-tation and dispersal patterns to form the modern fine-grained sed-imentary blankets. | 지질학 | null | kci_detailed_000237.xml | |||
ART000940410 | oai_dc | Disturbance of groundwater table by subway construction in the Seoul area, Korea | Disturbance of groundwater table by subway construction in the Seoul area, Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김윤영(중앙대학교); 이강근(서울대학교)"
] | Changes in groundwater table due to dewatering ofexcavations at the subway pumping station in Seoul were investi-gated. There are total 8 subway lines in the Seoul area, the totallength of 173 km; Line 1-8 are on operating. To lower the ground-water table beneath the subway tunnel, groundwater is extractedby the rate. The 1-5 lines subway network drains groundwater atthe rate of 78,417 m3/day. The tunnels of lines 6-8 are locatedlower than lines 1-5 and they are needed groundwater extractionmore than those of lines 1-5. Total groundwater extraction alongthe all subway lines is estimated to be approximately 200,000 m3/day. The groundwater monitoring data along the subway routeshows the line type drawdown pattern. Monitoring data on thedecline of water table along the subway route and basic data onhydrogeologic properties are used to analyze the spatial distur-bance range of groundwater systems due to the subway tunnels. | 지질학 | null | kci_detailed_000237.xml | |||
ART000940408 | oai_dc | Meltwater discharge anomalies in marine isotope stage 3 from a sediment core in the south of Antarctic Polar Front, Drake Passage | Meltwater discharge anomalies in marine isotope stage 3 from a sediment core in the south of Antarctic Polar Front, Drake Passage | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Sung Ho Bae(Korea Ocean Research and Development Institute, Ansan); Hoil Yoon(Korea Ocean Research and Development Institute, Ansan); Byong-Kwon Park(Korea Ocean Research and Development Institute, Ansan); Yeadong Kim(Korea Ocean Research and Development Institute, Ansan); Jang Jun Bahk(Korea Ocean Research and De... | Marine isotope stages (MISs) 1 to 5 were identifiedin the planktonic d18O record in sediment core DP00-02 just southof the Antarctic Polar Front within the Drake Passage, Antarctica.The oxygen isotope record based on Neogloboquadrina pachy-derma sinistral is wel correlated with the contemporaneous globald18O stratigraphy. Marked differences from the global climatecurve suggest a local/regional overprint, particularly during theMIS 3, which is considered as a colder time period in the oceanrecord than the MIS 1 and MIS 5 interglacial periods. The com-parison shows that negative d18O shifts in the core DP00-02 duringthe MIS 3 are larger than mean global changes that show a shiftequal to or smaller than 0.5. The isotope shift, exceeding the gla-cial-interglacial ice volume effect, probably resulted from changesin the isotope composition of sea water which is linearly related todecreases in salinity rather than increases in sea-surface temper-ature. Increased ice-rafted debris (IRD) content during this periodinterval indicates strong influx of IRD from melting ice shelvesand iceberg, which may be related to upwelling of warmer Cir-cumpolar Dep Water. | 지질학 | null | kci_detailed_000237.xml | |||
ART000940409 | oai_dc | Evaluation of contamination sources of groundwater NO3- using nitrogen isotope data: A review | Evaluation of contamination sources of groundwater NO3- using nitrogen isotope data: A review | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Woo-Jung Choi(서울대학교); Sang-Mo Lee(서울대학교); Hee-Myong Ro(서울대학교)"
] | It has been accepted that variations in stable N iso-tope ratios (15N/14N) can potentialy provide useful, sometimes unique,information on the sources of nitrate in groundwater, because Nisotope compositions are generally different among various Npools such as atmospheric N2, soil, chemical fertilizer, and manure.However, this review strongly suggests that interpretation of thenitrate source based on a single measurement of d15N may not beaccurate because the isotopic composition of groundwater nitrateis a function of its source and any isotope fractionation that mayoccur during its generation or transport to groundwater. Thisreview, therefore, shows that to evaluate the nitrate contaminationsource using d15N technique, it is more reasonable to use correla-tion between the concentrations and d15N of NO3-. For example, apositive correlation indicates 15N-enriched source such as manure,while 15N-depleted source results in a negative correlation. Thecorrelation analysis can also be used in evaluation of denitrifica-tion and nitrification. Denitrification is a key process affecting d15Nof NO3-, i.e. if significant amount of nitrate is removed throughdenitrification, it is not easy to discriminate fertilizer-derived nitratefrom manure- or compost-derived one because denitrification increasethe d15N of the remaining NO3-. Therefore, it is important to assesswhether denitrification may be occurring or not when evaluatingisotope data on nitrate. By using dual (d15NAIR and d18OVSMOW) iso-topic indicators, denitrification can be evaluated more accurately. | 지질학 | null | kci_detailed_000237.xml | |||
ART001197777 | oai_dc | Sedimentary characteristics and stratigraphic implications of the Kusan-dong Tuff, Cretaceous Gyeongsang Basin, Korea | Sedimentary characteristics and stratigraphic implications of the Kusan-dong Tuff, Cretaceous Gyeongsang Basin, Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"전용문(경상대학교); 손영관(경상대학교)"
] | The Cretaceous Gyeongsang Basin, SE Korea,developed on a continental arc massif, is filed with 6-9 km thick,nonmarine (aluvial, fluvial, and lacustrine) deposits and subduc-tion-related volcanogenic rocks. The Kusandong Tuff is a thin (2-4 m thick) but lateraly extensive (ca. 200 km long) ignimbrite sheet,rhyodacitic in composition and rich in crystals (40-60 vol.%). Thetuf has been used as an important key bed for stratigraphic clas-sification and correlation of the basin fil. Overall sedimentary andcompositional characteristics of the tuf suggest, however, that thenorthern and southern parts of the tuff represent different ignim-brite units. The northern part of the tuff (NKT), lying above anerosional contact, consists of a massive division and an overlyingstratified division, whereas the southern part (SKT), lying con-formably above the substrate, has a basal layered division beneatha massive division. The NKT has distinctively higher crystal (51-61 vol.%) and lithic (7.0-7.8 vol.%) contents compared with theSKT, which contains 35-48 vol.% crystals and 0.2-2.5 vol.% lithicfragments. Major and trace element compositions are also differ-ent, suggesting that the NKT and the SKT originated from com-positionally different magmas. These results suggest that the use ofthe Kusandong Tuf as an event stratigraphic unit needs to bereconsidered and the formations adjacent to the Kusandong Tuffneed to be redefined, especially in the Milyang subbasin. | 지질학 | null | kci_detailed_000237.xml | |||
ART000940440 | oai_dc | Tectonics of the eastern Asia and the western Pacific as seen by GPS observations | Tectonics of the eastern Asia and the western Pacific as seen by GPS observations | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Teruyuki Kato(the University of Tokyo)"
] | Instantaneous tectonic motions in the eastern Asiaand in the western Pacific have been measured by the Global Posi-tioning System. For this purpose, a continuous tracking networkin the area named as the Western Pacific Integrated Network ofGPS (WING) has been established. Obtained distribution of sitevelocities clearly suggests that oceanic plates such as Pacific andPhilippine Sea plates are moving mostly as rigid, while the conti-nental plate deforms considerably. Then, the Euler vector of thePhilippine Sea plate was estimated using GPS velocities at OkinoTorishima and other islands. In order to derive more detailedvelocity field in east Asia, many of published velocity fields werecombined so that they are consistent at the comonly occupiedsites in the least squares sense. Results clearly show tectonic col-lision of Indian subcontinent toward Eurasia. Moreover, it is evi-dent that the intruded lithosphere is extruding toward east showingacute bend of velocities in the north of Tibet. The effect of collisionlooks propagates towards far-east to Korea and Japan. Geograph-ical Survey Institute of Japan recently established a nationwidedense GPS array consisting of about 1000 permanent sites. Thevelocity field obtained from this network clearly portrays effects ofthe surrounding plates. | 지질학 | null | kci_detailed_000237.xml | |||
ART000940063 | oai_dc | Hydrology of the Gulf intra-coastal waterway in the San Bernard-Brazos river estuaries, Texas, USA: Oxygen isotopic ratio and salinity | Hydrology of the Gulf intra-coastal waterway in the San Bernard-Brazos river estuaries, Texas, USA: Oxygen isotopic ratio and salinity | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Kiseong Hyeong(Korea Ocean Research and Development Institute, Ansan); James R. Lawrence(University of Houston)"
] | A hydrological study using oxygen isotopic ratiosand salinities was carried out in the San Bernard-Brazos RiverEstuaries, Brazoria County, Texas, USA, to understand the influ-ence of 4 fresh water sources draining into the area, Brazos River,San Bernard River, Oyster Creek, and Jones Creek, on variousparts of the Gulf Intra-Coastal Waterway (GIW) that transectsthese rivers half to 1 mile inland of the Gulf of Mexico. The mea-sured oxygen isotopic ratios and salinities of GIW waters areexplained with simple mixing between one of the 4 fresh watersources with marine water and made it possible to identify 3 sub-areas of the GIW, each of which is influenced by different fresh-water source. These sub-areas locate on the western part of theBrazos River, between the Brazos and Old Brazos River, and onthe eastern part of the Old Brazos River, and have their freshwa-ter source from the San Bernard River, Brazos River, and OysterCreek, respectively. An interesting result was found in the GIWbetwen the San Bernard and Brazos Rivers, where fresh water ismainly sourced from the San Bernard River although its dis-charge rate is 40 to 100 times less than that of the Brazos River.This westerly flow of the San Bernard River toward the largerBrazos River is due to shallowing of the San Bernard River at theriver mouth, which restricts free discharge of river water to opensea and diverts the flow toward the GIW on both sides of the river.The influence of the other two creeks, Oyster and Jones, wasminor and limited near the confluence with the GIW due to minorinfluxes. The generalized flow pattern derived in this study isessential for the construction of contingency plan against toxiccontaminations, which wil minimize environmental impact onnumerous organisms living in the GIW. The results of this studyare also useful for tracing of contaminants in the studied GIW. | 지질학 | null | kci_detailed_000237.xml | |||
ART001197776 | oai_dc | A new Late Proterozoic stratum in South Korea | A new Late Proterozoic stratum in South Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Yongin Kim(서울대학교); Yong IL Lee(서울대학교)"
] | The Myeonsan Formation, the lowermost strata ofthe lower Paleozoic sequence, has basal conglomerate, which con-sists mostly of orthoquartzite and granitic gneiss clasts. The latterwas derived from the basement rock (the Taebaeksan Gneiss Com-plex) underlying the Myeonsan Formation. However, a Precam-brian sedimentary sequence, which is supposed to have suppliedorthoquartzite clasts, has not been reported in South Korea. Thisstudy reports a newly definable Proterozoic stratum, less than 10cm thick, formerly known as the lowermost part of the MyeonsanFormation. It is different from the lithology of the Myeonsan For-mation, but is same in petrographical and geochemical character-istics to orthoquartzite clasts in basal conglomerate of the MyeonsanFormation. This stratum is interpreted to have been a source rockof orthoquartzite clasts to the lower Paleozoic basin. It is inter-preted that the orthoquartzite sequence had been deposited in theLate Proterozoic, which is correlatable with the Guhyeon Systemin North Korea. | 지질학 | null | kci_detailed_000237.xml | |||
ART000940407 | oai_dc | Origin of deep-water sediment waves in the Ulleung Interplain Gap, East Sea | Origin of deep-water sediment waves in the Ulleung Interplain Gap, East Sea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Sang Hoon Lee(Korea Ocean Research and Development Institute, Ansan); Jang Jun Bahk(Korea Ocean Research and Development Institute, Ansan); Sung Kwun Chough(Korea Ocean Research and Development Institute, Ansan)"
] | A detailed analysis of Chirp (2-7 kHz) subbottomprofiles and a long (ca. 10 m) piston core reveals origin of deep-water sediment waves in the Ulleung Interplain Gap (UIG). Onthe basis of acoustic and lithologic characters, the sediments aredivided into two units: 1) upper transparent unit (UTU) and 2)lower wavy stratified unit (LWSU). The LWSU is characterized bya few regular wavy reflectors with upslope migration. Also, itgradually decreases downslope in wave height, wave asymmetryand thickness, and consists dominantly of fine-grained turbiditeswith subordinate pelagic and hemipelagic sediments. These sedi-mentary features indicate that the LWSU was most likely gener-ated by turbidity currents, rather than bottom currents. The UTU,discordant to the reflectors of the underlying LWSU, mostly com-prises muddy contourites and manganiferous contourites withrare fine-grained turbidites, reflecting intensified bottom-currentactivity and infrequent input of turbidity currents from the slopesof the Oki Bank and Dok Island. Under these conditions, a thin(3-6 m thick), elongate mound of bottom-current deposits (UTU)formed on the fine-grained turbidity current waves (LWSU). | 지질학 | null | kci_detailed_000237.xml | |||
ART000940061 | oai_dc | Phlogopite and tetraferriphlogopite from phoscorite and carbonatite associations in the Sokli massif, Northern Finland | Phlogopite and tetraferriphlogopite from phoscorite and carbonatite associations in the Sokli massif, Northern Finland | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Mi Jung Lee(Ecole des Mines); Daniel Garcia(Ecole des Mines); Jacques Moutte(Ecole des Mines); Jong Ik Lee(Korea Ocean Research and Development Institute, Ansan)"
] | The phoscorite-carbonatite complex (PCC) in theSokli masif, northern Finland, is divided into 5 stages accordingto mineral assemblages and occurrences. The earlier three stagescomprise phoscorites and calcite carbonatites (P1 to P3 and C1 toC3, respectively), and they usualy occur as pairs with the samemineral assemblage (calcite, apatite, megnatite, olivine, and mica).The latter two stages consist of only dolomite carbonatites calledD4 and D5. All micas investigated from the Sokli PCC fal in therange of the phlogopite-tetraferriphlogopite series. Tetraferriphl-ogopite begins to crystallize from late stage 2 and becomes a dom-inant silicate in the P3C3 rocks and D4-D5 dolomite carbonatites.Although tetraferriphlogopites occur as primary or secondaryproducts, discrete and euhedral (magmatic) tetraferriphlogopitesare considered to have crystallized from a melt strongly depletedin aluminumand saturated in Ti-bearing phases under low tem-perature condition. The chemical variation of phlogopites showsthat Fe and F contents increase, whereas Al, Ba, Ti and Mg con-tents decrease from stage 1 to stage 5. The progressive depletion inaluminum and the enrichment in fluorine towards the later stagesseem to be a specific feature of the Sokli phlogopite. The differenceof phlogopite rim compositions between phoscorites and pairedcarbonatites indicates that there was a slight difference of elemen-tal partitioning into the interstial melts during the segregation ofthe rocks from a parental magma. | 지질학 | null | kci_detailed_000237.xml | |||
ART000940062 | oai_dc | Trimodal distribution of CO2-bearing fluid inclusions in the gold-silver-bearing quartz veins of the Phuoc Thanh area, Central Vietnam: Its implication to the Au-Ag precipitation | Trimodal distribution of CO2-bearing fluid inclusions in the gold-silver-bearing quartz veins of the Phuoc Thanh area, Central Vietnam: Its implication to the Au-Ag precipitation | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Insung Lee(서울대학교); Dongbok Shin(서울대학교)"
] | CO2-rich fluid inclusions from quartz veins provideinformation about pressure-temperature conditions, as well aseffervescence, in the gold-silver-bearing quartz veins in the PhuocThanh area, Central Vietnam. Homogenization temperatures offluid inclusion are bimodal, and support textural evidence thatmineralization occurred in two stages. 90% of the fluid inclusionsin the quartz are CO2-bearing. The trimodal distribution of CO2mole fraction of the inclusions are common in the area, which indi-cates the CO2 unmixing, resulting the separation of the high (typeIb) and low (type IIa1) XCO2 fluids from the parental fluid (typeIa2) with intermediate XCO2. The precipitation of associated sul-fide and Au-Ag minerals is related to CO2 effervescence with aconcomitant decrease in sulfur activity. The temperature of min-eralization is estimated as the range from 300 to 380oC in stage Iand from 230 to 300oC in stage II. Pressure of ore formationranged from 350 to 500 bars during both stages. | 지질학 | null | kci_detailed_000237.xml | |||
ART001197561 | oai_dc | Why is the number of superplumes so limited? | Why is the number of superplumes so limited? | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Xiong Xiong(Chinese Academy of Sciences); Uk Han(Korea Military Academy); Rongshan Fu(University of Science and Technology of China); Jiwen Teng(Chinese Academy of Sciences)"
] | Numerical simulation shows that the hot plumescan be formed by the self-accelerated process if local thermal per-turbation is present. Since the local thermal perturbation mayexist extensively near the CMB and the transition zone around670 km, the number of the hot plumes should be great. The coldplume seems to be originated by the subduction slabs. Because thesubduction belts distribute extensively on the Earths surface, thenumber of the cold plume should be also great. However, theobserved number of the superplumes is much less than the sup-posed ones. A simple 2D model of whole mantle convection isdesigned to investigate the interaction between plumes and ther-mal anomalies. The hot thermal anomalies (HTA) are imposed atCMB and a depth of about 670 km discontinuity, corresponding totwo plausible locations of the hot plumes origination. And, the coldthermal anomalies (CTA) are imposed near the surface and670 km discontinuity, corresponding to the subducted slabs andpossible accumulation of slabs at 670 km discontinuity. Thenumerical results show that the fixed HTA does not originate anew plume. It draws the hot plume to move towards itself and sta-bilizes the plume at its own position. The imposed free HTA movestowards the hot plume, and finally merge with the plume. The sit-uation for the CTA is similar to that for the hot one. From thenumerical results, we can reach the following conclusions. It isvery dificult for the HTA/CTA to originate a new hot/cold plumein a convective flow field. The boundary instability is suppressedby the developed plumes. Instead of originating new hot/coldplumes, the HTA/CTA interact with the plumes to form hugesuperplumes. This might be one reason for the question, why thenumber of the superplumes is so limited. | 지질학 | null | kci_detailed_000237.xml | |||
ART000999744 | oai_dc | Some coniferous fossil woods from the Cretaceous of Korea | Some coniferous fossil woods from the Cretaceous of Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Kyungsik Kim(Chonbuk National University); Eun Kyoung Jeong(Chonbuk National University); Mitsuo Suzuki(Tohoku University); Min Huh(Chonnam National University); In Sung Paik(Pukyong National University)"
] | Thirteen silicified fossil woods were collected fromthe Cretaceous deposits of Haenam Basin and islands of Gwanmaeand Byeongpung, Jeollanam-do as well as from the CretaceousDadaepo Formation, Busan, Korea. Anatomical features of all ofthese specimens showed that they were coniferous woods. On thebasis of the detailed anatomical features they were identified asDadoxylon byeongpungense sp. nov., Cupressinoxylon uhangriensesp. nov., Taxodioxylon cf. nihongii Nishida et H. Nishida, Taxodiox-ylon albertense (Penhallow) Shimakura, and Mesembrioxylon sp.All of them, except Mesembrioxylon, are described for the firsttime from the Korean Peninsula. It should be noted that no dicot-yledonous wood has been found from this study. Generally thesampled horizons are considered as Upper Cretaceous with dino-saur footprint fossils. In Japan, the Upper Cretaceous sedimentsbear abundant dicotyledonous fossils. Therefore further studiesshould be needed to clarify the age of these horizons and the veg-etation in the ancient world with dinosaur. | 지질학 | null | kci_detailed_000237.xml | |||
ART000999556 | oai_dc | Fluid inclusion study of metamorphic gold-quartz veins in northwestern Nevada, U.S.A.: Characteristics of tectonically induced fluid | Fluid inclusion study of metamorphic gold-quartz veins in northwestern Nevada, U.S.A.: Characteristics of tectonically induced fluid | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Sangwon Cheong(Chungbuk National University)"
] | The study shows the nature of the fluid inclusionsanalyses in tectonically induced gold-quartz veins in northwesternNevada, U.S.A. and compares the results of fluid inclusions withthose of other gold deposits of similar environments in the world.The quartz veins are present in low-grade regionally metamor-phosed rocks, and form clusters of prospects along a north-trend-ing regional shear zone. These deposits and prospects are hostedby Mesozoic metasedimentary, metavolcanic, and deformed igne-ous rocks along thrusts, faults, folds, and shear zones. The gold-quartz veins are present in three major tectonostratigraphic ter-ranes: the Triassic Koipato and Star Peak Groups, Middle TriassicJungo terrane, and mid- Paleozoic to Jurassic Black Rock terrane.In general, the three major tectonostratigraphic units have beeninvolved in polyphase deformation. Fluid inclusions in vein quartzin northwestern Nevada, U.S.A. show that mineralizing fluids arewater-rich, CO2-H2O fluids with low-salinity (3-5wt% NaCl eq.).Homogenization temperatures range from 190 to 300oC, mostly250-300oC in median values. All fluid inclusion samples containvariable amounts of liquid and gases CO2 with 30 to 50 volumepercent of liquid and vapor ratio. Fluid densities estimated fromCO2-bearing fluid inclusions range from 0.5 to 0.85 g/cm3 and donot show significant differences between clusters throughoutnorthwestern Nevada. The results of fluid inclusion geobarometryindicate that the gold-quartz veins formed at depths, ranging from5.0 to 10.5 km, which corresponds to britle-ductile deformationalregimes. Consistent fluid chemistry and characteristics of fluidinclusions also indicate the fluids were from relatively homoge-neous single source of origin released during the Cretaceous time. | 지질학 | null | kci_detailed_000237.xml | |||
ART001197772 | oai_dc | Evolution of sedimentary basin in the southwestern Ulleung Basin margin: Sequence stratigraphy and geologic structures | Evolution of sedimentary basin in the southwestern Ulleung Basin margin: Sequence stratigraphy and geologic structures | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"S.H. Yoon(Cheju National University); S.J. Park(Korea National Oil Corporation); S.K. Chough(Seoul National, University)"
] | This study presents an evolutionary history of thesouthwestern Ulleung Basin margin on the basis of sequencestratigraphic and structural analyses of multi-channel seismicreflection profiles. Ten sequences and geologic structures identifiedin the late Tertiary strata sugest three distinct stages of basindevelopment in the early Miocene to Pliocene. In the early Miocene,the basin, bordered on the west by a step basement fault with nor-mal sense of offset, experienced a rapid subsidence giving rise to adeep-marine depositional setting. The movement of the basin-bor-dering fault ceased at the end of the early Miocene, then the basinsubsidence progressively slowed, which, coupled with increased ter-rigenous sediment input, resulted in the development of progradingshelf margin. In the late midle to late Miocene time (12.5-5.5Ma), the basin was characterized by compressional readjustmentby thrusting and folding. The sequential effects of this tectonicevent include local and regional angular unconformities, progra-dation-dominant shelf-margin depositional system and frequenttriggering of large-scale mass-failures in front of the thrust belt.Since the early Pliocene, the basin has progressively subsidedagain, forming aggradation-dominant shelf-slope system. | 지질학 | null | kci_detailed_000237.xml | |||
ART001197771 | oai_dc | Mineralogical evidence for red coloration of sandstones at the Chilgok Formation of the Cretaceous Hayang Group, Southeastern Korea | Mineralogical evidence for red coloration of sandstones at the Chilgok Formation of the Cretaceous Hayang Group, Southeastern Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Chang Oh Choo(Kyungpook National University); Young Sik Shin(Kyungpook National University); In Seok Koh(Kyungpook National University)"
] | The present study was focused on red sandston bedsoccurring in the Chilgok Formation, lower Hayang Group of Cre-taceous age. Red sandstones consist mainly of plagioclase, quartz,and volcanic rock fragment, with accessory minerals such asbiotite, chlorite, pyroxene, hornblende, leucoxene, ilmenite, sphene,pyrite, and hematite. Volcanic rock fragments composed of pyrox-ene, plagioclase, and glass material are intensively altered. Red-dening of sandstones was preferentially attributed to the presenceof hematite, Fe- and Ti-bearing minerals. Hematite pigmentationwas largely caused by post-depositional disolution of Fe-silicatessuch as chlorite, biotite, and amphibole. Diagnostic alteration ofmafic minerals as wel as Ti-bearing minerals, together with clayminerals, indicates that pigmentary materials in the red bedsinherited from diagenetic sources in the depositional basin, possi-bly during early diagenesis. | 지질학 | null | kci_detailed_000237.xml | |||
ART001195760 | oai_dc | Movement history of the Andong Fault System: Geometric and tectonic approaches | Movement history of the Andong Fault System: Geometric and tectonic approaches | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"최범영(한국지질자원연구원); 이승렬(한국지질자원연구원); 최현일(한국지질자원연구원); 황재하(한국지질자원연구원); 권석기(한국지질자원연구원); In-sae Ko(Korea Institute of Geoscience and Mineral Resources); Gi-o An(Korea Institute of Geoscience and Mineral Resources)"
] | The Andong Fault is one of the E-W trending bound-ary faults that separate the Cretaceous Gyeongsang Basin fromthe surrounding basement. Several reverse faults are developedparallel to the Andong Fault, and these faults together with theAndong Fault are named collectively the Andong Fault System.The fault system is characterized by significant fault drags. Struc-tural features enable us to analyze the geometry and slip vectorsof faults, on the basis of which we can develop an understandingof the related tectonic setting. The results of the analysis of thefault drags indicate that the Andong Fault System had a largelyreverse motion. The major movement of the hanging wall wasmainly toward the southeast and partly toward the south. Theages of pre- and post-reverse faulting plutons indicate that thereverse movement of Andong Fault System occurred between theCretaceous and the Early Tertiary times. In addition, consideringthe distribution of strata, the Andong Fault might have played therole of a transfer fault during the E-W extension of the Gyeong-sang Basin, from the early stage of the opening and throughout thebasin development. | 지질학 | null | kci_detailed_000237.xml | |||
ART000999557 | oai_dc | Stable isotope record and depositional environments in the Antarctic Polar Front of Drake Passage, Western Antarctica | Stable isotope record and depositional environments in the Antarctic Polar Front of Drake Passage, Western Antarctica | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Sung Ho Bae(Korea Ocean Research and Development Institute); Ho Il Yoon(Korea Ocean Research and Development Institute); Byung-Kwon Park(Korea Ocean Research and Development Institute); Cheon Yun Kang(Korea Ocean Research and Development Institute)"
] | A high-resolution study including oxygen and car-bon stable isotopes as wel as planktonic foraminifera, carbonate,ice-rafted debris (IRD) contents, were performed on one core sed-iment (DP00-02) taken from the seamount top near AntarcticPolar Front (APF) in the Drake Passage, Western Antarctica.Based on the oxygen stable isotope records measured on Neoglo-boquadrina pachyderma (sin.), this sediment core is interpreted torepresent a stratigraphic record back to the lower isotope stage 5(-129 kyr). Isotope stages 5, 4 and 1 show a high abundance ofcarbonate and planktonic foraminifer with relatively low IRD con-tent. In contrast, isotope stages 3 and 2 are characterized by lowabundance of carbonate with remarkably high IRD content. Thisis probably attributed by a local/regional influence due to frontstructural changes, related to the fluctuation of APF, i.e., the southand northward migration of polar water mass. The glacial-inter-glacial shifts in d18O values of N. pachyderma (sin.) may reach upto 1 to 1.2 indicating that, global ice volume changes haveaffected the isotope records. However, the isotope stage 3, gener-ally interpreted as the less warmer period in the global recordthan Holocene and stage 5, corresponds to much lighter valuescompared to the global climate curve. This may be resulted fromchange in the salinity rather than change in the global ice volumeor the temperature. | 지질학 | null | kci_detailed_000237.xml | |||
ART000999558 | oai_dc | A Permian phillipsiid trilobite from Peninsular Malaysia | A Permian phillipsiid trilobite from Peninsular Malaysia | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Mohd Shafeea Leman(Universiti Kebangsaan Malaysia); Masatoshi Sone(University of New England)"
] | Pygidia of the trilobite Pseudophillipsia sp. arereported from the Permian Bera Formation, Pahang, PeninsularMalaysia, in association with a moderately rich brachiopod faunaof early Capitanian (Guadalupian) age. It resembles a slightlyyounger Capitanian species Pseudophillipsia acuminata Mansuy,1912 of northern Laos. This find suggests an additional faunal linkbetwen Indochina and Peninsular Malaysia (the East Malaya ter-rane) during Capitanian time. | 지질학 | null | kci_detailed_000237.xml | |||
ART001195762 | oai_dc | Estimation of soil moisture content from L- and P-band AirSAR data:A case study in Jeju, Korea | Estimation of soil moisture content from L- and P-band AirSAR data:A case study in Jeju, Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"E.Y. Kwon(서울대학교); S.E. Park(서울대학교); W.M. Moon(서울대학교); K.K. Lee(서울대학교)"
] | One of the important applications of polarimetricSAR in the geohydrology and agriculture is the estimation of sur-face soil moisture from the polarimetric SAR data. During thePacRim AirSAR campaign in Korea, the ground truth data aboutsoil moisture content and surface roughness characteristics werecolected. We intend to retrieve the surface parameters over thebare soil from multi-polarization and multi-frequency AirSARdata. In this study, the theoretical scattering model, the IEMmodel is inverted by two existing algorithms- the multi-dimen-sional regression technique by Dawson et al. (1997) and the inver-sion using 3-layer artificial neural networks (ANs) (Fung, 1994).As the first step, backscatter coefficients are calculated based onthe ground truth information, and then training paterns are gen-erated from within the valid ranges of surface parameters usingthe IEM model. The trained inversion models are tested to a set ofAirSAR data as wel as synthetic data. Root mean square (RMS)errors of estimated soil moisture from the AirSAR data are aver-age 3.1% in the regression and 4.2% in the inversion using theANNs. The methods to improve the inversion acuracy are inves-tigated. First, the normalization of signal parameters reduced thenumber of pixels that fail to reasonable results in the regressionmodel. Second, the use of co-polarization ratio as input units in theANNs inversion scheme improve the soil moisture estimation,which results in an average RMS error of 2.9%. | 지질학 | null | kci_detailed_000237.xml | |||
ART000999748 | oai_dc | Stable isotopes and trace element compositions of the Upper Jurassic Solnhofen platy limestone | Stable isotopes and trace element compositions of the Upper Jurassic Solnhofen platy limestone | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Myong-Ho Park(Korea Institute of Geoscience and MineralResources); Franz T. F？sich(University of W？zburg)"
] | Records of stable isotope and trace element varia-tions along a 70.3 m long core are used to find out any paleoen-vironmental changes in the Upper Jurassic Solnhofen platylimestone. In the core, the Solnhofen platy limestone is composedof alternations of finely laminated carbonate-rich beds (=flinzbed) and even more finely laminated beds with a slightly higherclay mineral content (=fule bed). The matrix of both fule andflinz beds is an extraordinary fine-grained micrite consisting ofcalcite crystals <4 mm, partly recrystalized by diagenetic inter-granular microspar of 7-9 mm. The isotope composition of thebulk sediment ranges from -1.8 to +2.6 d13C, and -5.3 to -3.8d18O, respectively. The isotope composition correlates well, point-ing to diagenetic homogenization. The CaCO3 content variesmainly from 70% to 99% (87.1% for fule bed and 95.7% forflinz bed). The fule beds contain 165-176% more clastic or semi-clastic trace elements (Ti, V, Ga, Rb, Ba, Zr, Cr, U) than the flinzbeds, most likely due to a higher percentage of detrital input in thefule beds. Such cyclic variations between the fule and flinz bedsare thought to indicate changes in carbonate deposition on theUpper Jurassic Solnhofen basin. | 지질학 | null | kci_detailed_000237.xml | |||
ART000999749 | oai_dc | Rapid determination of CO2 production rates by a coulometric method | Rapid determination of CO2 production rates by a coulometric method | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Soobum Chang(서울대학교); Yong Il Lee(서울대학교)"
] | Dissolved inorganic carbon (DIC) is one of funda-mental parameters affecting physicochemical conditions ofaquatic environments. Normally, for fresh water samples, acid-base titration with Gran plot is used to determine DIC. The pro-cedure, however, requires more than tens of milliliters of solutionvolume, and CO2 in the ambient air may interfere with the titra-tion. A monitoring system composed of a flow-through device anda CO2 coulometer was developed to measure slow CO2 productionrate in an aqueous system. In this method, sample solutions aredirectly injected into a flow-through chamber in which a stream ofCO2-free carrier gas continuously removes dissolved CO2 from theinjected solution. Degassed CO2 is delivered to the coulometer inwhich integrated amounts of CO2 are measured. Detection limit ofthe method was found to be lower than 1010-12 molesCO2/s, whichdepends on factors such as flow rates, total CO2 concentrations aswel as baseline drift of the coulometer. As a demonstration, themethod was applied to the determination of CO2 production ratesvia degradation of coal organic matter. The method can be used formonitoring of slow DIC production involved in various geochemicalprocesses including the weathering of silicates, disolution of car-bonates and the oxidation of sedimentary organic carbon. | 지질학 | null | kci_detailed_000237.xml | |||
ART000999752 | oai_dc | Geolimnology of salt lakes | Geolimnology of salt lakes | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"William M. Last(University of Manitoba)"
] | Salt lakes are an important feature of the landscapeof many regions of the world. Despite their elevated salinities,saline lakes serve a variety of uses and form the cornerstone ofmultimilion-dollar minerals industries. Scientific investigation ofsaline lacustrine environments in many parts of the world extendsback over 100 years, although segmented disciplinary researchcontributed to generaly slow progress in our understanding of saltlakes throughout most of the 20th century. Only during the pastseveral decades has effort been directed toward unravelling thecomplexities of various interactive physical, chemical, and biolog-ical processes in modern salt lake systems. Modern salt lakesexhibit tremendous diversity in terms of hydrology, morphology,chemistry, and sedimentary processes. While most of todays saltlake basins are small and shallow, and many exhibit playa char-acteristics, noteworthy also are the giant saline lacustrine basins.Unlike the marine setting, salinity and ionic composition of saltlakes show great diversity, with virtually every water chemistrytype represented, often within the same geographic region. Asso-ciated with this large range in brine chemistry is an equallydiverse assemblage of endogenic and authigenic minerals found insalt lakes. Investigation of the stratigraphic records in ancientsaline lakes is in its infancy. Many avenues of paleolimnologicalinvestigation offer promise. Some approaches, such as decipheringpaleochemistry and paleohydrology from the endogenic mineralrecord and isotopic composition, have already been shown to besuccessful; others are essentially untried. Challenges for both fun-damental and applied researchers are to integrate the sedimento-logical and geochemical complexities exhibited by the modernlakes with the preserved stratigraphic records on a regional basis. | 지질학 | null | kci_detailed_000237.xml | |||
ART000897133 | oai_dc | Stable isotope profiles of Serripes groenlandicus shells.I. Seasonal and interannual variations of Alaskan Coastal Water in the Bering and Chukchi Seas | Stable isotope profiles of Serripes groenlandicus shells.I. Seasonal and interannual variations of Alaskan Coastal Water in the Bering and Chukchi Seas | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Boo-Keun Khim(Pusan National University)"
] | Serripes groenlandicus shells were collected alivefrom the eastern regions of the Bering and Chukchi seas whereAlaskan Coastal Water occupies dominantly. High-resolution sta-ble isotope profiles of the shell carbonates exhibit distinct, appar-ently annual, cycles caused by seasonal variations of temperature,seawater isotopic composition and other factors. The shell d18Oprofiles show a moderately high-amplitude seasonal temperaturecycle with considerable interannual variability. Superimposed onthe temperature-controlled cycles are periodic excursions whichare associated with reduced salinity, and more negative seawaterd18O, related presumably to an increased freshwater flux to theAlaskan Coastal Current during the summer. Comparison betweentwo oxygen isotope profiles supports the occurrence of seasonaland interannual variability of Alaskan Coastal Water in the east-ern part of the Bering and Chukchi Shelf. The cycles in the d13Cprofiles are interpreted as being controlled primarily by phy-toplankton productivity and seasonal temperature. In addition, atrend of more negative d13C values towards the later stage ofgrowth may reflect physiological changes associated with sexualmaturity, gametogenesis, and slower growth rate. The oxygen andcarbon isotope profiles as a biorecorder of bivalve shells are sub-stantiated in the subarctic environments, probing the seasonal andinterannual variation of Alaskan Coastal Water. | 지질학 | null | kci_detailed_000237.xml | |||
ART000997087 | oai_dc | Petrographical study on the Yucheon granite and its enclaves | Petrographical study on the Yucheon granite and its enclaves | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Jong Sun Kim(Pusan National University); Ki Cheol Shin(Pusan National University); Joon Dong Lee(Pusan National University)"
] | The Yucheon granite in the central Gyeongsangbasin composed of fine grained equigranular granite, mediumgrained equigranular granite, and porphyritic granite, and con-tains enclaves. The enclaves are classified into microenclave, maficmicrogranular enclave, and hybrid zone by their size. They showvarious features formed by magma mixing/mingling environment:abundant subrounded shape, sharp but partly difuse contact withhost granite, crenulated surface, equigranular texture, finer grainsize than host granites, rapakivi feldspar, phenocrysts in enclavesfrom granite, more mafic small enclave in large enclave, ocellarand ovoid texture, poikilitic quartz and alkali feldspar, chilled rim,etc. Very fine-grained equigranular texture these enclaves, exceptphenocryst from granite, reflects that mafic magma was in nearliquidus state when it was injected into granitic magma. Completemixing was not achieved in hybrid zone because of very shallowlevel intrusion, high thermal contrast, and abundant phenocrystswith net veining of granitic materials. These phenocrysts triggeredrapid crystallization of mafic magma. | 지질학 | null | kci_detailed_000237.xml | |||
ART001197775 | oai_dc | Mineralogical and geochemical controls on the formation of schwertman-nite and goethite in the wetland at Dalseong tungsten mine, Korea | Mineralogical and geochemical controls on the formation of schwertman-nite and goethite in the wetland at Dalseong tungsten mine, Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Chang Oh Choo(Kyungpook National University); Jin Kook Lee(Kyungpook National University)"
] | Schwertmannite and goethite are the most impor-tant minerals of ochreous precipitates from the wetland of theDalseong tungsten mine near southern Daegu. The main factorleading to precipitation of goethite and schwertmannite is the pHof the solution. Schwertmannite forms as a dominant mineralphase below pH 3.5. Formation of goethite takes place at the inlet,whereas schwertmannite predominantly precipitates at both thedownstream pond and outlet. Schwertmannite shows bundle ofneedle morphology with a similar range in size and its fine needlescoalesce to form rounded aggregates. Needles are approximately0.1-0.5 mm long and 0.1 mm wide. Decreasing pH at the down-ward ponds is attributed to formation of schwertmannite fromwater with high content of iron and sulphate ion. The removal rateof sulphate ion at downstream ponds is unremarkable possiblydue to supply of sulphate ion by organic decay in the reductionponds, although high content of sulphate ion is removed by form-ing schwertmannite. As precipitation of schwertmannite proceeds,iron is actively consumed and pH decreases. | 지질학 | null | kci_detailed_000237.xml | |||
ART000999750 | oai_dc | Thermal metamorphism of volcanic rocks on Barton Peninsula,King George Island, Antarctica | Thermal metamorphism of volcanic rocks on Barton Peninsula,King George Island, Antarctica | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Hyeoncheol Kim(서울대학교); Moonsup Cho(서울대학교); Jong-Ik Lee(Korea Ocean Research & Development Institute)"
] | Barton Peninsula is mainly composed of Tertiarymetavolcanic rocks and granodiorite. The metavolcanic rocksunderwent thermal metamorphism up to upper greenschist facies,producing calcic-amphibole (Amp), epidote, chlorite (Chl), calcite(Cc), plagioclase, prehnite and laumontite. Two metamorphic zones,Cc-Chl and Amp-Chl, are defined on the basis of mineral assem-blages (+plagioclase, quartz, opaque minerals), characterized byepidote+chlorite calcite and actinolite hornblende+epidote+chloritecalcite, respectively. The distribution coefficient of Mg-Fe* (totalFe) between actinolite and chlorite, defined by KD=(Mg/Fe*)Act/(Mg/Fe*)Chl, ranges from 0.56 to 1.03, suggesting low-pressure meta-morphism. The coexistence of actinolite and oligoclase also sup-ports low-pressure metamorphism. Chlorite geothermometry andT-XCO2 analysis suggest that metamorphic temperatures reachedca. 300oC at fluid pressures less than 1 kbar. Thermal metamor-phism in Barton Peninsula probably was associated with mag-matic-arc plutons emplaced during the Tertiary subduction of thesoutheast Pacific plate under Antarctic Peninsula. | 지질학 | null | kci_detailed_000237.xml | |||
ART000999751 | oai_dc | Construction and interpretation of a hydrogeological data base for the Seoul groundwater system | Construction and interpretation of a hydrogeological data base for the Seoul groundwater system | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김윤영(중앙대학교); 이강근(서울대학교)"
] | This paper presents a GIS-based study of the urban hydrogeology of the Seoul area. The groundwater relationship between the Han River and adjacent aquifer has been analyzed.
Line type fluctuations of groundwater level are decreased along the Han River from Inchun to Chamsil Low Dam. The pumping rate are difficult to extrapolate to the past, since seepage of groundwater into the subway system has increased in recent years, and the amount of increase is unknown. A groundwater flow model is developed to simulate the flow characteristics of groundwater in and around the subway lines. Water-level changes associated with the subway pumping station are estimated. The water budget of the groundwater system in the Seoul area and the movement of groundwater flow are estimated. The amount of groundwater available for use from an aquifer of Seoul area is not supplied from the natural recharge only. The additional sources are expected to be the increase in recharge or leakage from urban activity induced by well development and subway line, along with the reduction in discharge. | 지질학 | null | kci_detailed_000237.xml | |||
ART000999754 | oai_dc | Polarimetric synthetic aperture radar (SAR) and geodynamic applications: An overview of a new Earth system observation concept | Polarimetric synthetic aperture radar (SAR) and geodynamic applications: An overview of a new Earth system observation concept | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Wooil M. Moon(서울대학교); Joong-Sun Won(Yonsei University)"
] | 지질학 | null | kci_detailed_000237.xml | ||||
ART001128409 | oai_dc | Cambrian in the Land of Moring Calm | Cambrian in the Land of Moring Calm | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Duck K.Choi(서울대학교)"
] | 지질학 | null | kci_detailed_000237.xml | ||||
ART001128549 | oai_dc | Facies distribution patterns and environment reconstruction of the upper member of theL？ncara Formation in the Somiedo-Correcilla unit with special respect to biofacial investigations | Facies distribution patterns and environment reconstruction of the upper member of theL？ncara Formation in the Somiedo-Correcilla unit with special respect to biofacial investigations | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Thomas Wotte(Freiberg University of Mining and Technology)"
] | 지질학 | null | kci_detailed_000237.xml | ||||
ART001128548 | oai_dc | A trilobite fauna in a storm bed in the Poleta Formation (Dyeran, Lower Cambrian),Western Nevada, U.S.A. | A trilobite fauna in a storm bed in the Poleta Formation (Dyeran, Lower Cambrian),Western Nevada, U.S.A. | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"J. Stewart Hollingsworth(Institute for Cambrian Studies)"
] | An unusual occurrence of trilobites is present at the TH Pit where a unique combination of fossil concentration and weathering are important factors. This site is in the upper part of the middle member of the Poleta Formation, 64 m above the base of the Dyeran Stage in the Montezuma Range, Esmeralda County, Nevada. The fossil bearing bed is a 30-cm-thick, poorly bedded siltstone associated with meter-scale, fine grained sandstone storm beds. The unweathered fossiliferous rock is very hard calcareous siltstone which fractures irregularly across the contained trilobite sclerites. Pre-Miocene weathering has modified this rock to a punky, non-calcareous siltstone that splits cleanly around internal and external molds of trilobite sclerites. The boundary between the weathered and unweathered parts of this bed is sharp and crosses stratification with irregular convex surfaces. The fauna of this unusual bed is limited to trilobites which occur as a bioclastic mixture of isolated sclerites, often broken, plus articulated trilobites. Some of the trilobites are variably twisted, suggesting that this layer is the result of a storm event. The fauna includes predominately olenelloids, Teresellus goldfieldensis n. gen. and sp. and Elliptocephalus praenuntius (Cowie, 1968), with a common ptychopariid, Keeleaspis? terhaari n. sp. and a rarer corynexochid, Polliaxis hanseni n. sp. These trilobite species are known elsewhere in the Esmeralda Basin at the same stratigraphic position but not all together at the same site. | 지질학 | null | kci_detailed_000237.xml | |||
ART000965586 | oai_dc | The base of a revised Middle Cambrian: are suitable concepts for a series boundary in reach? | The base of a revised Middle Cambrian: are suitable concepts for a series boundary in reach? | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Gerd Geyer(Institut fYr PalSontologie, Bayerische Julius-Maximillians-Universit？t)"
] | Defining the base of a series that replaces the traditional Middle Cambrian is among the difficult tasks of Cambrian stratigraphy. Non-traditional concepts (such as carbon isotope signatures), microplankton (such as acritarchs), and most invertebrate fossils (e.g., brachiopods) may act as auxiliary tools for intercontinental correlation of regional calibration but are unable to provide the base for fine-scaled global correlation at present. As a result, the selection of a Global Stratigraphic Section and Point will have to root on trilobites which appear to be the only reliable index fossils to define such a GSSP. Five possible levels of correlation within the traditional Lower-Middle Cambrian boundary interval have been discussed: (1) the FAD of Oryctocephalus indicus; (2) the FAD of Ovatoryctocara granulata and/or Kiskinella cristata; (3) the FAD of Arthricocephalus chauveaui; (4) the base of the Acidiscus-Cephalopyge assemblage "zone"; and (5) the base of the STH "band". The potentials of these levels are analyzed in this study. All of them suffer from certain deficiencies such as limited insight into the stratigraphic ranges of key species; problems of confident identification of the index species; or absence of key faunal elements on certain Cambrian continents; that make them invalid for high-precision correlation on a global scale. However, the combination of (1) through (4) promises an intercontinental correlation that can be used as a global framework, which will be sufficiently accurate to serve normal correlation purposes. | 지질학 | null | kci_detailed_000237.xml | |||
ART000965589 | oai_dc | The utility of late Early to Middle Cambrian small shelly fossils from the westernMediterranean | The utility of late Early to Middle Cambrian small shelly fossils from the westernMediterranean | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Olaf Elicki(Freiberg University)"
] | New data on Cambrian small shelly fossils from Germany and Sardinia, and Spain are discussed with respect to their stratigraphical, paleogeographical, and paleoecological value. It is shown that these small shelly assemblages represent very useful tools for reconstruction of geological processes and of the Perigondwanan history in the Mediterranean area, especially, if trilobites are absent or hard to recover from the rocks. The German and Sardinian assemblages reflect distinct ecological conditions on shallow platform and shelf areas and mirror any changes in these habitats. Thus, lateral and vertical transitions from restricted inner platform to deep subtidal conditions are documented by characteristic successions of Sardinian assemblages. German assemblages show clearly distinct paleogeographic/ecological developments. The reorganization of the ecosystems is linked to shelf-wide processes which can be stratigraphically correlated in their single phases (e.g., drowning of platforms, breakup of the Perigondwanan realm, origin of terranes). Broader paleogeographic relationships of small shelly fossils to the Far East and Australia are proposed and support earlier controversial assumptions based on trilobites. Because of the small shelly fossils distribution patterns, a pre-Late Cambrian separation of terranes from the so called European shelf of western Gondwana is unlikely. During the Early to Middle Cambrian a rather uniform and weakly differentiated facies belt across most of the European shelf is indicated, and this contradicts earlier concepts of more-or-less isolated depositional basins. Despite recent progress in knowledge of Mediterranean small shelly fossil assemblages, further improvements will lead to a better understanding and a much more detailed picture of the Cambrian history of Perigondwana and its relationships to other paleocontinents. | 지질학 | null | kci_detailed_000237.xml | |||
ART000965587 | oai_dc | Two Cambrian agnostoid trilobites, Agnostotes orientalis (Kobayashi, 1935) and Lotagnostus americanus (Billings, 1860): Key species for defining global stages of the Cambrian System | Two Cambrian agnostoid trilobites, Agnostotes orientalis (Kobayashi, 1935) and Lotagnostus americanus (Billings, 1860): Key species for defining global stages of the Cambrian System | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Shanchi Peng(Nanjing Institute of Geology and Palaeontology ,Chinese Academy of Sciencs); Loren E. Babcock(the Ohio State University)"
] | The systematics, stratigraphic distribution and geographic distribution of two widely distributed agnostoid species from the Furongian Series of the Cambrian are reviewed. The species Agnostotes orientalis (Kobayashi, 1935) and Lotagnostus americanus (Billings, 1860) have been described from around the world under a variety of species and subspecies names, and have been assigned to a variety of genera. Nomenclatural problems have hindered to some extent a full understanding of the value of these two forms for intercontinental correlation. Both species have relatively narrow stratigraphic ranges and intercontinental distributions in open-shelf lithofacies. These conditions make these species excellent candidates for defining the bases of stage boundaries within the Furongian Series. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128454 | oai_dc | East-Gondwana/Laurentia trilobite connections - what do they tell us? | East-Gondwana/Laurentia trilobite connections - what do they tell us? | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"A.R.Parmer(Institute for Cambrian Studies)"
] | The geography of the Cambrian world depends largely on analysis of distribution patterns of marine faunas dominated by trilobites. Early Cambrian contrasts between east-Gondwanan faunas dominated by redlichiids and Laurentian faunas dominated by olenellids are well known and suggest a significant distance between these continents. On the other hand, slope- and/or cool-water facies contain numerous shared taxa (particularly agnostoids and oryctocephalids in the middle Cambrian). However, these taxa tell us little about geographic relations between the two continents. Apparent similarities among some less common polymerid trilobites, beginning in late early Cambrian time, may contribute significantly to a refined understanding of the geographic relations of these parts of the Cambrian world. However, taxonomic complications have hindered the usefulness of these taxa. A future project for the Cambrian Subcommission might be sponsorship of small international workshops among taxonomists, much like those developed by conodont workers. Such workshops, perhaps focused on stage-size intervals, might be able to reach consensus on a simplified and reproducible polymerid taxonomy of value for biogeographic analysis. | 지질학 | null | kci_detailed_000237.xml | |||
ART000965588 | oai_dc | Major geodynamic and sedimentary constraints on the chronostratigraphic correlation ofthe lower-middle Cambrian transition in the western Mediterranean region | Major geodynamic and sedimentary constraints on the chronostratigraphic correlation ofthe lower-middle Cambrian transition in the western Mediterranean region | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"J. Javier Alvaro(Universidad de Zaragoza); Sebastien Clausen(Laboratoire de Pal？ontologie et Pal？og？ographie du Pal？ozo？que)"
] | The sedimentary rocks of the lower-middle Cambrian transition in the western Mediterranean region have recorded a superposition of extensive tectonic, volcanic, epeirogenic, and eustatic events that led to a complex sequence framework that, in some cases, makes detailed chronostratigraphic correlations difficult. This paper summarizes and updates the relationships between event stratigraphy, fluctuations of relative sea level, setting of major stratigraphic discontinuities, unconformities, and condensed levels, and succession of benthic community replacements displayed by outcrops located in the Iberian Peninsula (Iberian, Cantabrian and Crdoba platforms), Moroccan Atlas (Souss Basin), and the Montagne-Noire and Sardinian platforms. The resulting mosaic of inter-related geodynamic processes is correlated by trilobite, archaeocyath- and acritarch-based chronostratigraphic scales, taking as reference for the base of the Middle Cambrian in West Gondwana the immigration of paradoxidid trilobites. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128503 | oai_dc | Eustatic versus tectonic control on the development of Neoproterozoic and Cambrianstratigraphic sequences of the Lublin-Podlasie Basin (SW margin of Baltica) | Eustatic versus tectonic control on the development of Neoproterozoic and Cambrianstratigraphic sequences of the Lublin-Podlasie Basin (SW margin of Baltica) | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Jolanta Paczes？na(Polish Geological Institute); Pawel Poprawa(Polish Geological Institute)"
] | A sequence stratigraphy is applied for the Neoproterozoic to Cambrian sedimentary fill of the Lublin-Podlasie Basin (LPB). The main goal of the study is to discriminate between eustatic and tectonic control on the development of sedimentary sequences. The Neoproterozoic and Cambrian sedimentary succession is subdivided into two second-order depositional sequences, separated by a major regional unconformity. The lower sequence A is poorly recognised. It is presumably of the early Neoproterozoic age and is characterized by continental to coastal shallow marine deposition. Sequence B comprises a time span of the (?late Neoproterozoic) to Middle Cambrian. The lowermost part of the sequence B is composed of a lowstand system tract (LST). A low relative sea-level (RSL), associated to the LST development, was controlled by regional thermal doming, followed by a rapid clastic and volcanogenic deposition, exceeding rate of subsidence of extensional grabens. The terminal Ediacaran was a time of a transgressive system tract I (TST I) development. Increase of the RSL was induced by a transition from syn-rift to post-rift subsidence. During the development of a following highstand system tract I (HST I) the RSL remained high. Significant local supply of sediments, exceeding in rate the basement subsidence, caused progradation of shoreline. The higher up-section TST II is characterized by gradual increase of the RSL and represents continuing thermal sag phase of the LPB. It was coeval with a global transgression and controlled mainly by eustatic sea level rise. The beginning of the Middle Cambrian corresponds to development of a HST II, controlled by decelerating rate of RSL rise, even though it coincides with the Hawke Bay regression. The HST II is therefore interpreted as controlled by local tectonic processes, superimposed on continued post-rift thermal subsidence of the passive margin. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128596 | oai_dc | Heterochrony of the Late Cambrian olenid trilobites from the Machari Formation,Yeongwol, Korea: implications for biostratigraphy and intercontinental correlation | Heterochrony of the Late Cambrian olenid trilobites from the Machari Formation,Yeongwol, Korea: implications for biostratigraphy and intercontinental correlation | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Hyun-A Hwang(서울대학교); Duck K. Choi(서울대학교)"
] | This study deals with the heterochrony of two Late Cambrian olenid trilobites, Olenus asiaticus Kobayashi, 1944 from the Glyptagnostus reticulatus Zone and Hancrania brevilimbata Kobayashi, 1962 from the Hancrania brevilimbata Zone, recovered from the Machari Formation in Yeongwol, Korea. Comparison of ontogenetic developments of Olenus asiaticus and Hancrania brevilimbata led to consider that the two species are phylogenetically related: viz., Hancrania brevilimbata is a probable descendant of Olenus asiaticus. The ontogenetic trajectories of the two species are closely comparable in the protaspid and early meraspid stages, but deviate in the late meraspid and holaspid stages. The morphological changes with growth in the Olenus asiaticus-Hancrania brevilimbata lineage may have resulted from combined heterochronic processes: i.e., the reduction of preglabellar field in the descendant is attained by paedomorphic progenesis, whereas the expansion of glabella is a consequence of peramorphic acceleration. Of these, the progressive reduction of preglabellar field has been known to occur in other parts of the world and thus is assumed to be useful in improving the biostratigraphic correlation among widely separated paleogeographic provinces, such as Baltica and Avalonia. The Glyptagnostus reticulatus Zone of the Paleozoic Gondwana can be correlated with the Olenus gibbosus Subzone of Avalonia and Baltica, while the Hancrania brevilimbata Zone of Korea with the O. attenuatus and O. dentatus subzones of Baltica and the lower part of the O. cataractes Subzone of Avalonia. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128455 | oai_dc | Changing perspectives on Cambrian chronostratigraphy and progress toward subdivision of the Cambrian System | Changing perspectives on Cambrian chronostratigraphy and progress toward subdivision of the Cambrian System | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Loren E. Babcock(the Ohio State University); Shanchi Peng(Nanjing Institute of Geology and Palaeontology ,Chinese Academy of Sciencs); Gerd Geyer(Institut fYr PalSontologie, Bayerische Julius-Maximillians-Universit？t); John H. Shergold(La Freunie)"
] | Important steps have been made toward global subdivision of the Cambrian System. The consensus of opinion is that the system should be subdivided into four series representing subequal spans of time. The lower two series will correspond approximately to the traditional Lower Cambrian, the third series will correspond approximately to the traditional Middle Cambrian, and the fourth series corresponds approximately to the traditional Upper Cambrian. The fourth series, called the Furongian Series, has been ratified by the International Union of Geological Sciences (IUGS). Selection of horizons representing evolutionary events that can be correlated on a global scale, and which can be used as stage or series boundaries, is much more difficult for the lower two series intervals of the Cambrian than it is for the upper two series intervals of the Cambrian. The most practical concept for subdividing the system into stages involves the establishment of two stages each for the first and second series, and establishment of three stages each for the third and fourth series. The lowermost stage of the Furongian, called the Paibian Stage, has been ratified by the IUGS, and the International Subcommission on Cambrian Stratigraphy (ISCS) is nearing decisions on the levels that will used to mark the bases of the upper two stages of the Furongian. Concerning stage boundaries within the proposed third series of the Cambrian, the ISCS is close to decisions on two levels that will be used to mark boundaries. | 지질학 | null | kci_detailed_000237.xml | |||
ART000965580 | oai_dc | The Cambrian-Ordovician stratigraphy of the Taebaeksan Basin, Korea: a review | The Cambrian-Ordovician stratigraphy of the Taebaeksan Basin, Korea: a review | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Duck K. Choi(서울대학교); Sung Kwun Chough(서울대학교)"
] | 지질학 | null | kci_detailed_000237.xml | ||||
ART001258624 | oai_dc | Our future resources, groundwater | Our future resources, groundwater | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Yongje Kim(Korea Institute of Geoscience and Mineral Resources); Franklin W. Schwartz(The Ohio State University)"
] | 지질학 | null | kci_detailed_000237.xml | ||||
ART001258626 | oai_dc | Simulating complex flow and transport dynamics in an integrated surfacesubsurface modeling framework | Simulating complex flow and transport dynamics in an integrated surfacesubsurface modeling framework | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Edward A. Sudicky(University of Waterloo); Jon P. Jones(University of Waterloo); Young-Jin Park(University of Waterloo); Andrea E. Brookfield(University of Waterloo); Dennis Colautti(University of Waterloo)"
] | A fully-integrated surface-subsurface flow and transport
model is applied to a 17 km2 subcatchment of the Laurel
Creek Watershed within the Grand River basin in Southern
Ontario, Canada. Through past and ongoing field studies, the subcatchment
is reasonably well characterized and is being monitored
on an ongoing basis. In addition to diverse land-usage and surface
cover and more than 65 m of topographic relief, the watershed is
underlain by a complex interconnected sequence of sand and
gravel aquifers that are separated by discontinuous clayey aquitards.
A steady-state condition was achieved in the model by calibrating
the subsurface flow field to 16 observation wells where
long-term hydraulic head data were available, while simultaneously
establishing a level of baseflow discharge on the surface
regime approximating the level observed at the beginning of the
transient simulation period. The model is then subjected to several
hundred hours of rainfall data and the resulting discharge hydrographs
are compared with the measured hydrographs. The calculated
subsurface hydraulic head distribution and surficial rainfallrunoff
responses, respectively, were shown to agree moderately
well with those observed in the system during this period. The
impact of an upland surficial contaminant source discharging
along a reach of a small stream within the subcatchment was also
examined. Results showed that short-duration, high-intensity concentration
peaks were not captured if annual or monthly average
rainfall was used as input. The hydraulic head and concentration
variations due to short-duration rainfall variations showed a
muted response with increasing depth below the streambed due to
the natural smoothing in the hydraulic response and to dispersion
and diffusion of the solute, respectively. Discrete daily precipitation
events were also found to cause rapid changes in the calculated
water and solute exchange fluxes. The variability and
sensitivity of these near-stream processes to the temporal resolution
of rainfall input, specifically the concentration and solute
exchange flux responses, may be significant in the prediction of
health risks to aquatic habitats. Overall, it is concluded that the
model is capable of reproducing surface and subsurface hydrodynamic
processes at the subcatchment scale although the results
could be better through improved parameterization of the subcatchment
and the manner in which the model simulates evapotranspiration
processes. | 지질학 | null | kci_detailed_000237.xml | |||
ART001258628 | oai_dc | What was the groundwater quality before mining in a mineralized region? Lessons from the Questa Project | What was the groundwater quality before mining in a mineralized region? Lessons from the Questa Project | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"D. Kirk Nordstrom(U.S. Geological Survey)"
] | The U.S. Geological Survey, in cooperation with the
New Mexico Environment Department and supported by Molycorp,
Inc (currently Chevron Minerals), has completed a 5-year
investigation (2001-2006) to determine the pre-mining groundwater
quality at Molycorp’s Questa molybdenum mine in northern
New Mexico. Current mine-site ground waters are often contaminated
with mine-waste leachates and no data exists on premining
ground-water quality so that pre-mining conditions must
be inferred. Ground-water quality undisturbed by mining is often
worse than New Mexico standards and data are needed to help
establish closure requirements. The key to determining pre-mining
conditions was to study the hydrogeochemistry of a proximal
natural analog site, the Straight Creek catchment. Main rock types
exposed to weathering include a Tertiary andesite and the Tertiary
Amalia tuff (rhyolitic composition), both hydrothermally altered
to various degrees. Two types of ground water are common in
mineralized areas, acidic ground waters in alluvial debris fans
with pH 3-4 and bedrock ground waters with pH 6-8. Siderite, ferrihydrite,
rhodochrosite, amorphous to microcrystalline Al(OH)3,
calcite, gypsum, barite, and amorphous silica mineral solubilities
control concentrations of Fe(II), Fe(III), Mn(II), Al, Ca, Ba, and
SiO2, depending on pH and solution composition. Concentrations
at low pH are governed by element abundance and mineral
weathering rates. Concentrations of Zn and Cd range from detection
up to about 10 and 0.05 mg/L, respectively, and are derived
primarily from sphalerite dissolution. Concentrations of Ni and
Co range from detection up to 1 and 0.4 mg/L, respectively, and
are derived primarily from pyrite dissolution. Concentrations of
Ca and SO4 are derived from secondary gypsum dissolution and
weathering of calcite and pyrite. Metal:sulfate concentration ratios
are relatively constant for acidic waters, suggesting consistent
weathering rates, independent of catchment. These trends, combined
with lithology, mineralogy, and mineral solubility controls,
provide useful constraints on pre-mining ground-water quality for
the mine site where the lithology is known | 지질학 | null | kci_detailed_000237.xml | |||
ART001258630 | oai_dc | Fusion of hydrologic and geophysical tomographic surveys | Fusion of hydrologic and geophysical tomographic surveys | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Tian-Chyi Jim Yeh(The University of Arizona); Cheng-Haw Lee(National Cheng Kung University); Kuo-Chin Hsu(National Cheng Kung University); Jet-Chau Wen(National Yunlin University of Science and Technology)"
] | In this paper, we argue the need for high-resolution characterization of the subsurface and discuss difficulties of traditional characterization approaches to meet this need. Necessary and sufficient conditions are then presented for well-posedness of groundwater inverse problems associated with identifying spatially distributed parameters. Non-uniqueness and large uncertainty in model calibration are subsequently attributed to difficulties in collecting information to meet these conditions. Using an example, we show that a tomographic survey can make problems of identification of spatially distributed parameters better posed. We subsequently present some recent advances in hydrologic/geophysical characterization of the subsurface using information fusion based on tomographic survey concepts. This paper includes hydraulic and electrical resistivity tomographic surveys as well as fusion of hydraulic and resistivity tomography and fusion of hydraulic and tracer tomography | 지질학 | null | kci_detailed_000237.xml | |||
ART001258629 | oai_dc | Arsenic reduction and precipitation by shewanella sp.: Batch and column tests | Arsenic reduction and precipitation by shewanella sp.: Batch and column tests | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"임미선(Korea Eco-Products Institute); 여인욱(전남대학교); 노열(전남대학교); 이강근(서울대학교); 정명채(세종대학교)"
] | The effect of bio-geochemical processes on speciation, fate, and transport of arsenic was investigated through the laboratory tests. Shewanella sp., iron-reducing bacteria, was used for batch and column tests. In contrast to the control batch test, the bio-active batch test indicated that Shewanella sp. reduced As(V) to As(III) with concurrent oxidation of lactate to acetate and the decrease of Eh. As time went, a significant amount of the precipitates were formed, and the removal of arsenic species from the solution was attributed to precipitates. SEM-EDX and chemical analyses of the precipitates suggested that As(III) and As(V) were precipitated with sulfides. The reduction and subsequent precipitation of arsenic species were also observed in the column tests. The batch and column tests suggest that in natural groundwater system, Shewanella sp. participates in the reduction of As(V) and sulfate, and sulfides produced by the microbial activity precipitate As(V) and As(III). | 지질학 | null | kci_detailed_000237.xml | |||
ART001258625 | oai_dc | Lessons from practice in the assessment and remediation of contaminated ground water | Lessons from practice in the assessment and remediation of contaminated ground water | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Franklin W. Schwartz(The Ohio State University); Eung Seok Lee(The Ohio State University); Yongje Kim(Korea Institute of Geoscience and Mineral Resources)"
] | The famous American humorist Mark Twain once wrote “don’t let school interfere with your education”. This paper builds on this theme by examining important lessons that come from work on practical problems of ground-water contamination and remediation in Canada and the United States. We draw lessons from the interesting features of the studies, and mistakes in execution, which have had important consequences. The first case study from Edmonton, Alberta Canada examines a problem of ground-water contamination due to leakage of water contaminated by 2,4-D and other contaminants from a small storage pond. This study highlights the problems related to an inadequate geologic understanding of a site, misunderstandings concerning the advantages and limitations of key tools for site investigation, and how projects can benefit from early and ongoing peer reviews. The second case study examines a problem of sewage contamination related to a deep tunnel system in Milwaukee Wisconsin. This system is designed to store surface-water overflows from an old, combined sewer system. This case study highlights the difficulties in working on unique problems without an effective conceptual hydrogeologic model, the need to always be concerned about the quality of chemical data, and the necessity of being alert to behaviors beyond typical experience. The lessons coming from these case studies have important implications for remedial work being undertaken in Korea and regulatory agencies with oversight of the projects. | 지질학 | null | kci_detailed_000237.xml | |||
ART001258633 | oai_dc | Estimation of river stage effect on groundwater level, discharge, and bank storage and its field application | Estimation of river stage effect on groundwater level, discharge, and bank storage and its field application | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"하규철(한국지질자원연구원); 고동찬(한국지질자원연구원); 염병우(한국지질자원연구원); 이강근(서울대학교)"
] | This paper presents the hydraulic interaction between aquifer and river related with bank storage. A convolution equation was used to analyze the aquifer response, discharge, and bank storage due to river stage fluctuation. River stages were generated to describe flood peak, asymmetry, and duration. The simulation results suggest that the geometry of flood hydrograph can play an important role in affecting the discharge and bank storage. The presented model was applied to a field data, and the site is a floodplain aquifer of the Mangyeong River. Aquifer responses for the various flood duration and flood peak were observed at the site, which is well matched with the simulated results. A model parameter, the riverbed leakance was determined from calibration with the simulated and observed groundwater levels. After the determination of each parameter, the discharge and bank storage can be calculated. The presented method is a good tool to assess the hydraulic interaction between the aquifer and the river, as arbitrary river stage fluctuations are used. The limitation of the method is that the actual discharge and bank storage can be different from the calculated ones, when significant regional groundwater gradient exists. It also can be a useful tool before applying more complex numerical models. | 지질학 | null | kci_detailed_000237.xml | |||
ART001258627 | oai_dc | Modeling of water flow and heat transport in the vadose zone: Numerical demonstration of variability of local groundwater recharge in response to monsoon rainfall in Korea | Modeling of water flow and heat transport in the vadose zone: Numerical demonstration of variability of local groundwater recharge in response to monsoon rainfall in Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"구민호(공주대학교); 김용제(한국지질자원연구원)"
] | The rainfall of Korea in the summer monsoon period occupies more than 50% of the annual precipitation in most areas, and thus groundwater recharge to shallow aquifers is dominantly controlled by the amount and the pattern of monsoon precipitation. This paper presents two numerical models that demonstrate linear relationships between precipitation and recharge. First, a simple heat transport model employing a lumped parameter approach is presented for estimating two lumped parameters related to water flux and thermal diffusivity in the vadose zone. The model determines the parameters by a simple optimization process that minimizes the root-mean-square error between simulated and measured temperatures. The model is applied to 22-year time series data of soil temperatures measured at a synoptic station of Korea. The impact of monsoon precipitation on the thermal regime is clearly reflected in the simulated results by illustrating a linear relationship between precipitation and the water flux in the vadose zone. Secondly, an infiltration model is presented for analyzing variability of precipitation recharge in relation to the monsoon rainfall. The model simulates the unsaturated flow from time series data of precipitation and pan evaporation, assuming immediate removal of surface ponding, a linear relationship between the evaporation rate and the soil water content, and a static water table. Numerical simulations were performed for three soil textural groups by using 20-year meteorological data. The results demonstrate that the annual recharge is linearly proportional to the annual precipitation with varying degrees of the correlation coefficient depending on soil types. Sensitivity analyses show that the uncertainties in evaporation-related model parameters significantly affect the model results with controlling tradeoff between recharge and evaporation estimates. | 지질학 | null | kci_detailed_000237.xml | |||
ART001258631 | oai_dc | Performance of open borehole thermal energy storage system under cyclic flow regime | Performance of open borehole thermal energy storage system under cyclic flow regime | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Kun Sang Lee(Kyonggi University)"
] | Thermal energy storage can be accomplished through the installation of an array of vertical boreholes. Coupled hydrogeological-thermal simulation of the storage system is essential to provide an optimized configuration of boreholes and operation schedule for the thermal storage system on the site. This paper presents numerical investigations and thermohydraulic evaluation of open borehole thermal energy storage (BTES) system operating under cyclic flow regime.
A three-dimensional numerical model for groundwater flow and heat transport is used to determine the annual variation of recovery temperature from the borehole thermal energy storage. The model includes the effects of convection and conduction heat transfer, heat loss to the adjacent confining strata, and hydraulic anisotropy. The operation scenario consists of cyclic injection and recovery after holding interval and four periods per year to simulate the seasonal temperature conditions. For different parameters of the system, performances were compared in terms of extraction temperature. The calculated water temperature at the producing pipe remains relatively constant within a certain range through the year. Heat loss, injection/production rate, and geometrical configuration of boreholes and aquifer used in the model are shown to impact the predicted temperature profiles at each stage and the recovery water temperature. However, injection temperature and hydraulic anisotropy have a less significant effect on the performance of BTES systems. Absolute permeability does not affect the temperature, but is inversely proportional to the injection pressure. | 지질학 | null | kci_detailed_000237.xml | |||
ART001258632 | oai_dc | Emissions of ammonia and nitric oxide from an agricultural site following application of different synthetic fertilizers and manures | Emissions of ammonia and nitric oxide from an agricultural site following application of different synthetic fertilizers and manures | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Piw Das(세종대학교); 김기현(세종대학교); Jae-Hwan Sa(세종대학교); 배위섭(세종대학교); 김조천(건국대학교); 전의찬(세종대학교)"
] | In the present study, ammonia (NH3) and nitric oxide (NO) emissions were measured by the dynamic flux chamber (DFC) method from a cropland of Chinese cabbage over a one and a half month period (September-October, 2006). By applying a combination of three treatment (T) types (comprising different proportions of manure, urea, and NPK fertilizer) to the crop field, the effects of such treatments on emission flux were assessed in relation to the amount and type of fertilizer. The magnitude of NH3 emission (g m-2 h-1) varied in the following order: T2 (4,067), T1 (2,263) and T3 (738). NO fluxes (g m-2 h-1) also followed the same descending order of T2 (898) > T1 (477) > T3 (81). The possible effects of soil pH on NH3 fluxes were detected, as they concurrently exhibited a gradual and periodic change during the experimental period. Likewise, temperature was also found to have significant effect on NH3 and NO emission behavior. The results of the present work confirm that the application of fertilizer, when tested in the form of diverse treatment types, affected the emission of NH3 and NO in fertilized field soils at varying degrees. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128700 | oai_dc | Effect of Tween surfactant components for remediation of toluene-contaminated groundwater | Effect of Tween surfactant components for remediation of toluene-contaminated groundwater | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Dal-Heui Lee(서울대학교); Eun-Sik Kim(서울대학교); Ho-Wan Chang(서울대학교)"
] | The objectives of this study were to select potentiallysuitable surfactants that solubilize toluene present as a contami-nant and to determine the effectiveness of toluene removal fromgroundwater by the selected surfactants. Four different surfac-tants of Tween series were chosen based on surfactant types, tox-icity, HLB (Hydrophilic-Lipophilic Balance), CMC (Critical Micellewas not able to solubilize at least 1 mL of toluene and was con-sidered inefective. Tween 40, Tween 60 and Tween 80 were rela-tively good toluene solubilizers. The highest recovery (98%) of thetoluene was obtained using a nonionic surfactant (Twen 60) in thebatch experiments. In Tween series surfactant, the trend of ionicstrength magnitude in sampled groundwater was closely relatedwith that of recovery rates. The ionic strength of aqueous phasehad a strong efect in aqueous activity. The aqueous activity wasdecrease when ionic strength was incremployed may be useful for rapid selection of surfactants and areessential for reducing cost in surfactant-assisted remediation. Also,these selected surfactants are expected to be in practical use forremediation of toluene-contaminated groundwater. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128647 | oai_dc | Milankovitch cycles and paleoceanographic evolution within sediments from ODP Sites 980 and 983 of the North Atlantic Ocean | Milankovitch cycles and paleoceanographic evolution within sediments from ODP Sites 980 and 983 of the North Atlantic Ocean | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Sangmin Hyun(South Sea Institute/KORDI); Naokaze Ahagon(Hokkaido University); Ho-Il Yoon(KOPRI)"
] | Sediments from Ocean Driling Program (ODP)Sites 980 and 983 in the North Atlantic Ocean were analyzed toobtain evidence of long-range Milankovitch cycles and to examinethe cycles’ effect on the paleoceanographic evolution of the NorthAtlantic Ocean. Wide cyclic variations in total organic carbon andbiogenic carbonate occur throughout the columns at both sites andprovide distinctive characteristics of both sediment groups. Spec-tral modeling of these variations shows typical 100-ka cyclic vari-ations in both the total organic carbon (TOC) and carbonate recordsat Site 980, although this 10-ka Milankovitch frequency occursonly in the uper, ~472.5 ka, section of the core. In Site 983, only400-ka cycle in carbonate is observed but the 10-ka cycle in TOCand carbonate is absent. The terrigenous content, expressed interms of K, Al, Ti, and Th, also shows strong 100-ka and 400-kacyclic variations at Site 983. The earth’s eccentricity as expressedand precession (23-ka) are important characteristics of North Atlan-tic Ocean sediments. Milankovitch pulse differences in carbonate,TOC at the two sites likely arise from the evolution of paleocean-ography. The dilution of carbonate fractions by terrigenous mate-rials (indicated by the cyclical behavior of trace elements) at Site 983is one of plausible explanation. Climatic warming over the last 600ka probably caused the differences in the sedimentary cycles at thetwo sites; induced meltwater discharge is recorded in the terrige-nous record, and changes in the oceanic circulation system arerelated to major glacialinterglacial climatic episodes that probablyunderlie the differences in the cyclical records. | 지질학 | null | kci_detailed_000237.xml | |||
ART000970960 | oai_dc | Variation in dip-angle of the Indian plate subducting beneath the Burma plate and its tectonic implications | Variation in dip-angle of the Indian plate subducting beneath the Burma plate and its tectonic implications | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"P. K. Khan(Indian School of Mines)"
] | The paper presents an analysis of the dip-angle ofthe Benioff zone trajectory, infers the state of stress of the descend-ing Indian plate and the overriding Burma plate, and proposesthree-stage episodic development of the descending Indian lithos-phere and the Burma plate along the strike of the Indoburmanarc. The first stage accounts for the late Oligoceneearly Mioceneeastwest stretching of back-arc region, which divided the centralcanic line. The dip-angle of Benioff zone trajectory in sector II (ca.24.0° to 25.5°N), the late Oligoceneearly Miocene westward tran-scurrent displacement of blocks, and the eastwest splitting of lateCretaceousearly Eocene ophiolites are evidences of this stretch-ing. The effect of stretching probably lasted through til whenpost-middle Miocene causing northnortheastward motion of thehanging Indian lithosphere together with the Burma plate throughthe asthenosphere. This may have been the cause of the westwardoffset between the main Irrawaddy River and the Chindwin Riverin the second stage. Northsouth varying degree of decouplingaccount for the interplay between the Indoburman arc and thenorthward moving Indian plate. The stres state and northsouthshallow level seismicity observed in the present study may be evi-dences for a slow subduction of the Indian plate in the recent orthird stage of development. | 지질학 | null | kci_detailed_000237.xml | |||
ART001128699 | oai_dc | Solubility-normalized Freundlich isotherm for the prediction of sorption of phenols in HDTMA modified montmorillonite | Solubility-normalized Freundlich isotherm for the prediction of sorption of phenols in HDTMA modified montmorillonite | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"신원식(경북대학교); 송동익(경북대학교)"
] | Single- and bisolute competitive sorption of phenols(2-chlorophenol, 3-cyanophenol and 4-nitrophenol) onto montmorillonitemodified with cationic surfactant (hexadecyltrimethylamonium,HDTMA cation) was investigated. In single-solute sorption, sorptionaffinity increased in the order of 2-chlorophenol > 4-nitrophenol >3-cyanophenol, as expected from the magnitude of the octanol-water partition coefficient (Kow). The difference in affinity is mainlyattributed to the hydrogen bonding with the water moleculesincorporated in the sorbed phase. The sorption affinity of thephenolic compounds onto the HDTMA-montmorillonite was inthe order of pH 7 > pH 3 >> pH 11.5. Compared to uptake at pH3 and 7, the uptake at pH 11.5 was quite low. The reduced uptakeat pH 1.5 is attributed to lower solubility of anions in the core ofthe organic medium due to the unfavorable hydrophobic inter-action between hydrated anions and nonpolar organic mediumand thus anions adsorbing near the surface of the nonpolarthe single-solute sorption data well. Competition between thesolutes in bisolute sorption reduced the sorbed amount of eachsolute compared with that in the single-solute system. The idealadsorbed solution theory (IAST) coupled with the solubility-normalized Freundlich model predicted the bisolute competitivesorption data successfully. The solubility-normalized model wasanalyzed to characterize sorption mechanism of phenols ontoHDTMA-montmorillonite at very low (Henry’s law resion) and athigh concentration (Ralout’s law region). | 지질학 | null | kci_detailed_000237.xml | |||
ART001128802 | oai_dc | The Wangsan Fault: One of the most 'active' faults in South Korea? | The Wangsan Fault: One of the most 'active' faults in South Korea? | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이진한(고려대학교); 권성택(연세대학교)"
] | The Wangsan Fault in the Gyeongju area shows thelargest known displacement of about 28 m among the Quaternaryreverse faults in South Korea. Recent optically stimulated lumi-nescence (OSL) age data of the Quaternary deposits cut by theslip rate and maximum recurrence interval of the fault movementare 0.52 ma1 and 50 ka, respectively. If considering the thick-ness of the Quaternary deposits exposed and assuming a uniformsedimentation rate, however, the slip rate and recurrence intervalmight be about five times higher and shorter, respectively. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128752 | oai_dc | Dependency of hydrologic responses and recharge estimates on water-level monitoring locations within a small catchment | Dependency of hydrologic responses and recharge estimates on water-level monitoring locations within a small catchment | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Jin-Yong Lee(GeoGreen21 Co., Ltd.); Myeong-Jae Yi(GeoGreen21 Co., Ltd.); Daekyoo Hwang(Samyoon E&C Co., Ltd.)"
] | Estimation of groundwater recharge is essential forplanning sustainable groundwater development. In this study,recharge ratios were estimated using the groundwater hydro-graphs obtained from monitoring wels located in a smal catch-ment (0.256 km2). The catchment area is a triangular alluvial plainbounded by gentle hills and a large stream. For the recharge esti-used. Although the study area is very small, the groundwaterhydrographs were very different depending on the thickness of theunsaturated zone and the distance of the monitoring wel from themain stream. Where the unsaturated zone is thick, the ground-water level changes smoothly in response to rainfall and resultingamplitude is small. In addition, the hydrographs closer to thestream showed quicker responses and larger fluctuations. Result-ant recharge estimates showed a very wide variation between2.5 and 20.1%. Compared with 12.7% estimated by other studymainly based on the water budget analyses, the recharge ratiosoverestimated in downgradient area (stream). Therefore, for rep-resentative and appropriate recharge estimation based on thegroundwater hydrographs, it appears that the monitoring locationis most important. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128801 | oai_dc | A new approach for persistence in probabilistic rock slope stability analysis | A new approach for persistence in probabilistic rock slope stability analysis | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박혁진(Sejong University)"
] | Discontinuity persistence is defined as the fraction of area (or length) that is actually discontinuous, with reference to a discontinuity plane which is through the rock mass containing a combination of discontinuities and intact rock regions. Although persistence is one of the most significant discontinuity parameters in slope stability analysis, it is impossible in practice to measure the discontinuity area accurately in a field investigation. Therefore, several researches have carried out on the basis of different approaches such as numerical analysis and fracture mechanics. In this study, the persistence is considered as a random variable since the persistence is difficult to obtain in the field and subsequently involves uncertainty. In addition, while most previous stability analyses have assumed that discontinuity on the failure plane is fully persistent, the probability that the joint length is long enough to produce a rock block failure (or that the joint length is equal to or greater than maximum sliding dimension) is evaluated in this study. That is, the probability of failure obtained from the previous approach is a conditional probability on the premise that the discontinuity on the failure plane is fully persistent. This approach simply uses joint length data rather than the persistence value in the procedure of obtaining the probability of fully persistent joint. Later the probability that fully persistent joint exists is multiplied by the probability of slope failure which itself is based on the assumption that joints are fully persistent. Consequently, in order to overcome the limitation of a conservative analysis, assuming 100% joint persistence, the proposed approach suggested new persistence concept based on the discontinuity length information. In this study, the proposed concept applies to the practical example. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128751 | oai_dc | Comparing the inverse parameter estimation approach with pedo-transfer function method for estimating soil hydraulic conductivity | Comparing the inverse parameter estimation approach with pedo-transfer function method for estimating soil hydraulic conductivity | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Do-Hun Lee(Kyung Hee University)"
] | The soil hydraulic conductivity was evaluated by theinverse parameter estimation method using the cumulative infil-tration data measured by the tension infiltrometer. The inverseparameter estimation approach combines the Levenberg-Marquardtnonlinear optimization method with the variably saturated flowequation. In addition to the inverse parameter estimation method,soil hydraulic conductivity was also determined by various pedo-transfer functions (PTF) which can be used to estimate soil hydraulicconductivity indirectly. The soil texture contents and organic carboncontent were measured at experimental sites and used as input vari-ables for PTF. A measure of rot mean square eror (RMSE) andmean absolute error (MAE) was utilized to compare soil hydraulicconductivity values betwen numerical inverse solution and PTF.The comparison of various PTFs indicated that PTF of Wsten et al.(1999) combined with the PTF of Cosby et al. (1984) was the bestpredictor for saturated hydraulic conductivity compared to theinverse solution. For unsaturated hydraulic conductivity, the PTF ofSchaap (1999, SSC) showed the best prediction. The accuracy of var-ious PTFs is highly variable depending on the saturated water con-tent information. The results and method presented in the paper canbe used as a hypothesis for further investigation and formulation ofPTF applicable to soil condition in Korea. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128648 | oai_dc | A reconnaissance on the use of the speleothems in Korean limestone caves to retrospective study on the regional climate change for the recent and geologic past | A reconnaissance on the use of the speleothems in Korean limestone caves to retrospective study on the regional climate change for the recent and geologic past | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Kyung Sik Woo(Kangwon National University); Gi Hoon Hong(KORDI); Don Won Choi(Kangwon National University); 조경남(강원대학교); Mark Baskaran(KORDI); Hyun Mi Lee(Korea Ocean Research and Development Institute)"
] | More than 1,000 limestone caves are extensivelydeveloped in Gangwon-do and Chungcheongbuk-do, Korea. A vari-ety of numerous speleothems are actively growing in these cavestoday. A potential to use speleothems as regional paleoclimateproxy was explored by analyzing soda straw, stalactite and stalag-mite. These proxy recorders that have grown during the past several210Pb. Mostspecimens collected from six limestone caves were found to have anexcess 210Pb, indicating that they are less than about 100 yrs old.This excess 210Pb was employed to estimate the growth rate for atubular “soda straw” that yielded a longitudinal growth rate of1.7 m/yr past 60 years. Coeval decrease in δ13C values of the sodastraw, spanning the time period of about 1930195 AD, mayreflect the carbon isotope ratio of atmospheric CO2 for the sameof recent speleothems along with age control using 210Pb excessmethod from the speleothems in Korean limestone caves promise agreat potential for the reconstruction of climate and environmentalchanges during the past hundred years or so. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128156 | oai_dc | U--Pb zircon ages of a granitic gneiss boulder in metadiamictite from the Ogcheon metamorphic belt, Korea | U--Pb zircon ages of a granitic gneiss boulder in metadiamictite from the Ogcheon metamorphic belt, Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"조문섭(서울대학교); 김현철(서울대학교); Yusheng Wan(Chinese Academy of Geological Sciences); Dunyi Liu(Chinese Academy of Geological Sciences)"
] | Zircon grains separated from a granitic gneiss boulder of the Hwanggangri Formation, Ogcheon metamorphic belt, were analyzed using a SHRIMP II ion microprobe. This gravelbearing formation consists primarily of greenschist to amphibolite facies metadiamictites. U−Pb zircon ages obtained from 31 grains provide not only diachronous inheritance ages ranging up to ca.
2.5 Ga but also define an apparent discordia with upper and lower intercept ages of ca. 1.87 Ga and ca. 290±40 Ma, respectively. The former age is consistent with the Paleoproterozoic age of granulite- facies metamorphism and granitic magmatism in the Gyeonggi and Yeongnam massifs. However, the latter age has not been reported from the basement gneisses and may be attributable to significant Pb loss during the Late Carboniferous Ogcheon orogeny recently dated at ca. 290−280 Ma. Alternatively, multiple Pb loss episodes including a ca. 400 Ma thermal disturbance may account for the array of discordant data. The tectonic implications for each hypothesis are enormous for deciphering the evolution of the Ogcheon belt, but precise interpretation awaits further geochronologic analyses. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128155 | oai_dc | Petrological and geochemical evidences for magma mixing in the Palgongsan Pluton | Petrological and geochemical evidences for magma mixing in the Palgongsan Pluton | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Won-Hie Choe(서울대학교); Yong-Joo Jwa(Gyeongsang National University)"
] | Cretaceous Palgongsan pluton in the Gyeongsang
basin is composed of coarse-grained porphyritic granite, mediumgrained
equigranular granite and aplite. The granites are designated
to calc-alkaline I-type granites. Mafic enclaves are easily found in
the pluton, and they are textually classified into fine-grained microgranular
mafic enclaves and medium-grained mafic enclaves. The mafic
enclaves in the granites are igneous in origin and comprise plagioclase,
amphibole, biotite, and small amount of apatite, opaque,
pyroxene and quartz. The mafic enclaves characteristically show
petrographical features such as fine-grained texture, mafic clots,
acicular amphibole, acicular apatite, plagioclase xenocryst, rapakivi
texture and ocellar quartz. This observation demonstrates
that the mafic enclaves are derived from mafic magma injection
into crystallizing granitic magma chamber. There are good linear
correlations in major oxide contents vs. SiO2 content in the Palgongsan
pluton. Particularly the compositional variation between
the granites and the mafic enclaves is possibly ascribed to twocomponent
mixing model. Highly linear compositional variation
trends between the Palgongsan porphyritic granite and the finegrained
mafic mircogranular enclaves can be best explained by
the compositional mixing of granitic magma with mafic magma
which injected into the crystallizing granitic magma chamber. However,
the compositions of the equigranular granite and the aplite
are characteristically of highly fractionated rock, and they are
caused by later stage fractionation of granitic magma independent
on the two-component mixing. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128262 | oai_dc | The evaluation and the sensitivity analysis of GIS-based landslide susceptibility models | The evaluation and the sensitivity analysis of GIS-based landslide susceptibility models | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"장훈(성균관대학교); Nak Kyong Kim(성균관대학교)"
] | This paper evaluated two prevalent GIS-based models
in landslide susceptibility; a deterministic-based approach and
a bivariate-based approach. The bivariate-based approach defines
the relationship between two variables individually, and this approach
calculates the weights, which can also represent the contribution of
factors. A deterministic-based approach is based on the geotechnical
equation and calculates the quantitative values for landslide
susceptibility. A number of GIS-based landslide projects and studies
have been frequently conducted for identifying or estimating
landslide prone areas using these two models. Results from those
studies were easily implemented into disaster-related policies. Therefore,
this paper highlighted discrepancies between these two models,
and fulfilled the sensitivity analysis. After two models were run,
the higher landslide susceptibility areas were quite different, and
the reasons may come from the factors, the data availability, the
data scale, and the data accuracy. The bivariate-based approach
was sensitive to factors, and higher susceptible areas were new forest
areas that have been presumably experienced by historical
landslides. The deterministic-based approach was substantially affected
by soil properties and slopes. The sensitivity analysis found that
soil data should be complete and extensive for the accurate landslide
susceptibility analysis. | 지질학 | null | kci_detailed_000238.xml | |||
ART000932681 | oai_dc | Geographic Information System (GIS) based stability analysis of rock cut slopes | Geographic Information System (GIS) based stability analysis of rock cut slopes | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Kyu-Sang Kim(Intelligeo Corporation); Hyuck-Jin Park(Sejong University); Saro Lee(Korea Institute of Geoscience and Mineral Resources); Ik Woo(Sejong University)"
] | Road construction is accompanied with the occur-rence of the cut slopes. Therefore, when the roads are constructedin mountainous terrain, the number of slopes is increased and theslopes are widely scattered in the regional area. In addition, thestability of rock cut slope is mainly dependent upon geologicalcharacteristics such as discontinuities in rock mass. In this study,the regional stability analysis technique based on GeographicalInformation System (GIS) was developed and applied to practicalcase, in which the road construction was planned and the plannedcut slopes were widely scattered. GIS is the effective tool to dealwith the widely scattered and the enormous number of data. Var-ious factors affecting on the slope stability analysis, such as thestructural domain, the orientation and dip angle of the cut slopes,nuities, were considered as theinput parameters for GIS. By overlaying input data layers andusing the developed computer algorithm, the factor of safety (F.S.)values, as an index of slope stability were calculated for each fail-ure mode, which considered for stereographic analysis and limitequilibrium analysis simultaneously. In this research, the factorsof safety for each failure mode are evaluated and the minimumfactor of safety is also evaluated in the divided small area. In ordermethod, the results of the cut rockslope stability were compared with actual failure modes and loca-tions in the study area. Finally, the stable and economically appro-priate cut angle for the planned rock slopes were suggested byusing the developed algorithm and applying allowable F.S. value. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128261 | oai_dc | Groundwater flow characterization in the vicinity of the underground caverns in fractured rock masses by numerical modeling | Groundwater flow characterization in the vicinity of the underground caverns in fractured rock masses by numerical modeling | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Hyung-Sik Yang(Chonnam National University); Jae-Gi Kang(Chonnam National University); Kyung-Su Kim(Korea Atomic Energy Research Institute); Chun-Su Kim(Korea Atomic Energy Research Institute)"
] | Groundwater inflow into the caverns constructed infractured bedrock was simulated by numerical modeling: NAP-SAC (DFN, discrete fracture network model) and NAMMU (CPM,continuous porous media model), which is a finite-element softwarepackage for groundwater flow in 3D fractured media developed byAEA Technology, UK. The input parameters for modeling arebased on surface fracture survey, core logging and single holehydraulic test data. In order to predict the groundwater inflow asaccurately as possible, the anisotropic hydraulic conductivity wasconsidered. The anisotropic hydraulic conductivities were calcu-lated from the fracture network properties and the in-situ fracturedata. With a minor adjustment numerical modeling is able to reasonably reproduce groundwaterinflows into the cavern as well as the travel lengths and the surfacearrival times through the flow paths. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128208 | oai_dc | Variations of terrigenous sediment supply to the southern slope of the Ulleung Basin, East/Japan Sea since the Last Glacial Maximum | Variations of terrigenous sediment supply to the southern slope of the Ulleung Basin, East/Japan Sea since the Last Glacial Maximum | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박장준(한국지질자원연구원); Sang-Joon Han(Korea Ocean Research and Development Institute); 김부근(부산대학교)"
] | In order to examine the variations of terrigenousdetrital components in the core (97PC-19) sediments from thesouthern margin of the Ulleung Basin, we detail changes in grain-size composition and contents of major elements such as detritalSiO2 (detSiO2), TiO2, Al2O3, MgO and K2O since the Last GlacialMaximum (LGM). The variations of detrital components are charac-terized by the significant elevations of detSiO2/Al2O3 and TiO2/Al2O3ratios with the concomitant increase of silt to clay ratios during thelast deglaciation (1015 ka). Such a prominent increase suggestsan enhanced flux of detrital quartz and Ti-bearing minerals rel-ative to Al-rich clay minerals which can be attributed to eitheraeolian transport or hemipelagic advection. Similar variations ofdetrital components during the last deglaciation are much morepronounced in the core 95PC-1, located more proximal to the KoreaStrait, as evidenced by the high sedimentation rate and sand andsilt contents. However, this temporal variation is not clearly observedin ODP site 797 far from the Korea Strait. The spatial change ofthe detrital components among the cores suggests a primary con-trol of hemipelagic fluxes of riverine sediments relative to aeoliandust fluxes on the variations of detrital components since the LGM.The hemipelagic fluxes were mostochannels of the Nakdong River that extended onto the shelf mar-gin of the Korea Strait during the last sea-level lowstand andincreased by shore-parallel transport of paleocurrents through theKorea Strait during the early stage of the postglacial transgression. | 지질학 | null | kci_detailed_000238.xml | |||
ART000939654 | oai_dc | NMR investigation of octahedral cis-trans occupancy changes during I/S dehydroxylation | NMR investigation of octahedral cis-trans occupancy changes during I/S dehydroxylation | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Yeong kyoo Kim(Kyungpook National University)"
] | I/S clays (<1 m size fraction) were analyzed by27AlNMR and infrared spectroscopy to investigate the double stepdehydroxylation behavior which can be observed in many 2:1 dio-ctahedral clays. The intensity changes of 27Al NMR peaks for tet-rahedral and octahedral sites during dehydroxylation were observed.The distorted oxygen polyhedra coordinating Al in the I/S dehy-droxylates caused almost complete 27coordinated sites and some loss from the six-fold sites. After asess-ing the extent of dehydroxylation of 7 samples heated at 700 C for1 hour by IR, theoretical six-fold Al NMR peak intensities werecalculated based on two previously proposed dehydroxylation mech-anisms and compared with the experimental ones. The calculationssuggest that there is no movement of the octahedral cations duringdehydroxylation in contrast with published XRD results. NMR resultsshowed that the different dehydroxylation temperatures for cis- andtrans- vacant clays can be caused by the different OH-OH dis-tances which required different energies for dehydroxylation. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128207 | oai_dc | Timing of trap formation in the southwestern margin of the Ulleung Basin, East Sea (Japan Sea) and implications for hydrocarbon accumulations | Timing of trap formation in the southwestern margin of the Ulleung Basin, East Sea (Japan Sea) and implications for hydrocarbon accumulations | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이광훈(Pukyung National University); Booyong Kim(Korea National Oil Corporation); SungJin Chang(Korea National Oil Corporation); Sik Huh(Korea Ocean Research and Development Institute); Han-Joon Kim(Korea Ocean Research and Development Institute)"
] | Contractional tectonism, associated with the backarc
closure of the East Sea (Japan Sea), resulted in a series of
thrust and anticline along the southern margin of the Ulleung
Basin, providing numerous traps that include the Dolgorae and
Gorae structures. Restoration of depth-converted seismic profiles
suggests two phases of contractional deformation in the area: (1)
the latest Early to late Late Miocene phase that created the Dolgorae
structures and (2) the late Late Miocene to Quaternary (?)
phase that created the Gorae structures. The second phase of contractional
deformation was accompanied by transpressional strikeslip
movements. The formation of the Dolgorae II and Gorae structures
postdated the main phase of oil generation but overlapped
and/or predated the main phase of gas generation. The Dolgorae
I and III structures began to form during the later stage of oil generation
but did not have significant relief until the beginning of the
main phase of gas generation. Thus, potential for large oil accumulations
in the area is probably limited. Older and deeper structures,
predating the contractional deformation, may have accumulated
oil if later tectonic movements had not disrupted their trap integrity. | 지질학 | null | kci_detailed_000238.xml | |||
ART000939655 | oai_dc | A modified Waldron test based on sliding skewness for determining asymmetric cycle in a turbidite section | A modified Waldron test based on sliding skewness for determining asymmetric cycle in a turbidite section | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Basab Mukhopadhyay(Geological Survey of India); Partha Pratim Chakraborty(Indiana School of Mines); Tapan Majumder(Indiana School of Mines)"
] | The non-parametric ‘sign-of-difference’ Waldron test,
conventionally used for identifying asymmetric cyclicity (thinningor
thickening-up) in turbidite successions, often fails to offer convincing
results either when bed thickness distribution is lognormal
or where positive and negative cycles are present in equal abundance.
A modified Waldron test based on sliding skewness method
(taking a number of bed thickness at a time) is proposed here for
determining asymmetric cycles in turbidite successions, which
appears to be random in their bed thickness distribution based on
conventional Waldron test. The method has been tested on two
turbidite sections, which belong to two different settings of a single
submarine fan system (Andaman Flysch Fan) that is known to
have a lognormal bed thickness distribution. Application of the
sliding skewness methodology reveals thinning-upward asymmetric
cycles in both of these sections, which corroborate with the
field observations and paleoenvironmental interpretations. Statistical
significance for the proposed methodology was determined on
the studied sections both through the Z-value and appropriate
two-tailed null hypothesis. It is proposed that the result (thickening
or thinning upward) is invariant with the interval (number of
bed thickness taken for calculation) chosen for the sliding skewness
calculation. This new method can be used on bed thickness
measurement data from any turbidite succession in addition to
other tests for identifying asymmetric cyclicity where non-parametric
Waldron Test fails. | 지질학 | null | kci_detailed_000238.xml | |||
ART001186086 | oai_dc | Depositional processes of the gravelly debris flow deposits, South Dolomite alluvial fan,Owens Valley, California | Depositional processes of the gravelly debris flow deposits, South Dolomite alluvial fan,Owens Valley, California | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Bok Chul Kim(Korea Institute of Geosciences and Mineral Resources); Donald R. Lowe(Stanford University Stanford)"
] | coarse-grained debris flow was instigated in the South
Dolomite alluvial fan of the Inyo Mountains piedmont, Owens Valley,
California, by a concentration of flashy thunderstorm precipitation
in 1984. The debris flow extends about 650 m from the fan
apex to the Owens Lake, and forms levee deposits along the sides
of the passing tract in the steep (6−26°) upper-fan (proximal) segment
and lobe deposits at the flow terminus in the less steep (3−6°)
lower-fan (distal) segment. Both the levee and lobe deposits consist
of clast-supported, unstratified, poorly sorted, pebble-to-bouldergrade
gravels. The length of the levees is much longer than that of
lobe and the clasts exhibit flow-parallel [a(p)] long-axis orientation
in the levees but flow-transverse [a(t)] orientation in the lobe, suggesting
that the levees were formed by “pushing aside” mechanism,
i.e., lateral (or oblique) accumulation of clasts from the surge heads.
On the other hand, the lobe deposit was formed by sourceward
incrementation of successive unsaturated debris flow surges. Detailed
analyses of the grain-size distribution indicate distinct inverse
grading of the clasts both in lobe and in levee deposits with respect
to maximum clast size and graphic mean grain size. The inverse
grading is mainly attributed to clast collision, with the upward displacement
of large clasts due to dispersive pressure combined with
kinematic sieving. It is notable however that the graphic mean size
of the levee matrix shows normal grading, which can be explained
by the combined effect of hindered settling and fluid turbulence.
The bimodal grain-size distribution of the levee matrix suggests an
incomplete mixing of coarser-grained surge head materials and
finer-grained surge body and tail materials. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128748 | oai_dc | Cretaceous lacustrine stromatolites in the Gyeongsang Basin (Korea): Records of cyclic change in paleohydrological condition | Cretaceous lacustrine stromatolites in the Gyeongsang Basin (Korea): Records of cyclic change in paleohydrological condition | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"우경식(강원대학교); 김부근(부산대학교); H.S. Yoon(Kangwon National University); K.C. Lee(Sangji University)"
] | Textural observation and stable isotope analyses ofmiddle Cretaceous lacustrine stromatolites of the SinyangdongFormation, Gyeongsang Supergroup (Korea) reveal that the alter-nating laminations preserve the cyclic change of paleohydrologicalconditions influenced by local paleoclimate. These alternating lam-inations are repetitive, consisting of a lower fibrous calcite and anupper microbial micrite layer forming a couplet, which is individ-ually about 2 always gradational, but upper-to-lower boundaries are sharp andabrupt, reflecting not only cessation of growth but also subaerialdissolution. A δ18O enrichment from fibrous calcite to microbialmicrite is consistent, indicating lowering of paleolake level mainlydue to strong evaporation during the dry period when the stro-matolite grew. Simultaneous and coeval depletion in δ13C fromfibrous calcite to microbial micrite suggests that more availableare 12C atoms provided by the decay of organic matter due to thedecreasing paleoproductivity and lowering lake level. These sys-tematic trends of texture and isotopic composition may be intrin-sically linked to local paleoclimate change. | 지질학 | null | kci_detailed_000238.xml | |||
ART001128697 | oai_dc | The 29 May 2004, Mw=5.1, offshore Uljin earthquake, Korea | The 29 May 2004, Mw=5.1, offshore Uljin earthquake, Korea | {
"journal_name": "한국지질과학협의회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"강태섭(서울대학교); Chang-Eob Baag(서울대학교)"
] | We present results of a preliminary analysis for sourceparameters of the 29 May 2004 offshore Uljin earthquake. Theanalysis is based on a set of broadband and short period velocityseismograms, and accelerograms recorded by seismic networks insouthern Korea. The estimated parameters of the mainshock are asfolows: origin time 19:14:25.82 in Korean local time (10:14:25.82UT), latitude 36.626N, longitude 130.054 E, depth 18 km, mag-nitude Mw 5.1, stress drop 28 bars, one focal plane 337 , 56 and78 , and the other plane 178 , 36 and 107 in strike, dip and rake,respectively. Three aftershocks of Mw 2.3, 2.0 and 2.4 occurredwithin source region of the mainshock, and two other events of Mw2.5 and 3.5 at epicenters beyond the rupture area are presumed tobe triggered dynamically by the 29 May 2004 earthquake. Thelargest ground acceleration, 2.62 %g, was instrumentally recordedat Pohang, 90.4 km south-west of the mainshock epicenter. Themaximum instrumental intensity is estimated as V and VI in Mod-ified Mercalli Intensity scale excluding and including local effects,respectively. There is a possibility that the mainshock-aftershocksequence and one of the dynamically triggered events are directlyrelated to the Ulleung Fault. | 지질학 | null | kci_detailed_000238.xml |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.