• 한국지구과학회:학술대회논문집
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• 2010.04a
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• pp.124-127
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• 2010

본 연구에서는 통가 해역 라우분지의 열수 광상 가능성이 있는 해산들에 대하여 자력탐사가 수행되었다. 그 중 TA 09 해산에 대하여 심해견인 자력탐사가 실시되었으며 심해견인 자력탐사는 정밀한 탐사를 위하여 해저면에서 약 50 ~ 60 m 고도를 유지하며 자력계를 견인하였다. 탐사지역의 총 자력 성분은 Overhauser Proton Magnetomer (모델 SeaSPY 300(해상자력계)m, SeaSPY 6000(심해견인자력계))를 이용하여 측정되었다. 탐사 해산들 중 해상자력탐사와 심해자력탐사가 같이 수행된 TA 09 해산과 주요 열수 광상 유망 지역으로 분류되는 TA 12, 26 해산에 대해서만 측정된 지자기값을 이용하여 자기이상도를 구하였으며 자화역산법을 이용하여 자화이상도를 제작하고 분석하였다. TA 09 해산과 TA 26 해산에서의 해상 자기이상도는 쌍극자 이상형태의 단순이상을 보이며 TA 12 해산에서는 정상부에 고이상이 나타나고 그 주변으로는 저이상대가 분포하고 있다. TA 09 해산에서의 해상자력계에 의한 자기이상치와 심해견인자력계에 의한 자기이상치를 비교하여 보면 거의 10배 이상의 해상도 차이를 보여준다. 연구지역 탐사해산들의 해저지형과 비교하여 보면 열수분출대의 가능성이 높은 저자화이상대들은 주로 해산의 정상부 및 정상부 칼데라와 그 칼데라 주변부에 주로 위치하고 있는 모습을 나타내고 있다. 향후 타 탐사 해산들에 대한 자기이상에 대한 정밀처리/분석 후 탄성파 탐사결과, 암석샘플의 결과 및 지화학결과 등과 비교하여 열수광상의 존재 여부 및 위치 추정 분석이 필요할 것으로 판단된다.

• 한국지구과학회:학술대회논문집
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• 2006.02a
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• pp.213-218
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• 2006

이 논문에서는 지구통계학적 시뮬레이션을 이용하여 자료 표현에서의 불확실성이 최종적인 공간통합에 미치는 영향을 정량적으로 분석하고자 하였다. 광물자원 탐사를 위한 공간통합 사례연구를 통해 시뮬레이션 결과에 따라 예측 능력의 차이가 나타남을 확인 할 수 있었으며, 결론적으로 지구통계학적 시뮬레이션이 공간 자료의 불확실성 모델링에 효율적으로 이용될 수 있을 것으로 판단된다.

• Economic and Environmental Geology
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• v.37 no.1
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• pp.35-48
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• 2004

This paper provides a comprehensive overview of geochemical approaches for investigating and assessing heavy metal contamination in abandoned mine sites. Major sources of contaminants at the abandoned mine sites are mine water, waste rocks, tailings, and chemicals used in beneficiation and mineral processing. Soil, sediment, surface and ground water, and ecological system can be contaminated by heavy metals, which are transported due to erosion of mine waste piles, discharge of acid mine drainage and processed water, and dispersion of dust from waste rocks and tailings. The abandoned mine sites should be characterized using various methods including chemical analysis, mineralogical analysis, acid generation prediction tests, leaching/extraction tests, and field tests. Potential and practical environmental impacts from the abandoned mines should be assessed based on the site characterization.

• Journal of Korean Society for Geospatial Information Science
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• v.3 no.1 s.5
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• pp.115-121
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• 1995

Recently, spatial integration for mineral exploration is regarded as an important task of various geological applications of GIS. Therefore, theoretical bases of data representation and reasoning concerned with Dempster-Shafer theory and Fuzzy theory were systematically as the data-driven integration methodologies for raster-based geoinformation; they are distinguished from target-driven methodology based on statistical background. According to previous actual applications of these methods to mineral exploration, they have been proven to provide useful information related to hidden target mineral deposits, and it is thought that some suggestions in this study are helpful to further real applications including representation, reasoning, and interpretation stages in order to obtain a decision-supporting layer.

• Economic and Environmental Geology
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• v.14 no.1
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• pp.1-25
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• 1981

This paper is a literature review on the following subjects: 1) relationships between porphyry molybdenum and copper systems; 2) hydrothermal environments of molybdenite depositions; 3) genetic significance of molybdenite polyforms; and 4) trace element patterns in molybdenite useful as an exploration guide. The geologic similarities between porphyry molybdenum (e. g. Climax) and porphyry copper (e. g. Bingham) systems exist, and similar techniques can be applied for exploring deposits of either type. Several features suggest that tungsten and tin may form porphyry-like systems (i. e. lowgrade, large tonnage). The clustering of porphyry-like systems in geophysically distinctive batholithic provinces is well documented and provides larger targets for reconnaissance exploration. Geochemical studies suggest that uranium should often occur in close proximity to molybdenum ores in igneous as well as sedimentary environments.

• Journal of the Mineralogical Society of Korea
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• v.24 no.3
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• pp.245-252
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• 2011

콜롬비아는 안데스 산맥의 북단에 위치하며 NS 방향의 단층대를 기준으로 지질 환경의 차이가 크다. 단층대를 기준으로 동부지역은 원생대 변성암류와 이를 피복하는 고생대 변성퇴적암류가 주로 분포하며, 서부 지역은 고생대 퇴적암류, 중생대 화성암류, 제 3 기 화산양류 및 퇴적암류가 주로 분포한다. 지화학이상대는 6개 그룹으로 분류되며, 철 (Fe), 귀금속(Au, Ag, Pt), 기초금속(Cu, Pb, Zn), 희유금속(Sn, Cr, Co, Mn, Mo, Ni, Nb, W, V, Mg, Ti, Be, REE, Ga, Zr, Hf, Se, Te, Ta, Cd, In, Li 등) 빛 핵원료자원인 U 이상대로 구성된다. 콜롬비아의 주요 부존자원은 석탄, 니켈, 금 및 에메랄드이다. 에메랄드, 석탄 및 니켈은 세계적인 매장규모와 생산량을 보인다. 콜롬비아는 탐사가 거의 수행되지 않은 지역이 전 국토의 49%에 달해 광물부존 잠재성은 현재보다 크게 높을 것으로 보인다. 따라서 최근 콜롬비아와의 광물자원 협력이 강화되고 있는 시점에서 미탐사 지역을 대상한 공동탐사를 지화학 이상대가 확인된 지역을 중심으로 수행하여 신규광체를 확보하고, 광물자원 협력을 강화함으로써 공동개발 여건을 마련할 필요가 있다고 판단된다.

• Economic and Environmental Geology
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• v.47 no.4
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• pp.351-362
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• 2014

In order to grasp the geological characteristics, the occurrence mode of ore body and development potential of Bophi Vum chromite mineralized zone in northwestern Myanmar, Korea Institute of Geoscience and Mineral Resources(KIGAM) and Department of Geological Survey and Mineral Exploration(DGSE) carried out joint exploration targeting on the $6km^2$ areas within the mineralized zone. Chromitites occur as a major Cr-ore body in the Bophi Vum area, and are enveloped by dunitic peridotites. As a result of geological survey, the geological map of Bophi Vum was drawn in the scale of 1:1,000, and we discovered that the chromitite ores are mainly distributed at the elevation range between 200 and 400 m. The soil geochemistry was conducted by collecting total 114 soil samples in the interval of 50 m after pitting ground surface under 0.7-1 m. Geochemical anomaly maps of Cr, Ni, Fe, and Mn were prepared by ICP-AES.

• Geophysics and Geophysical Exploration
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• v.2 no.2
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• pp.96-103
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• 1999

Most of saline water inousions have been diagnosed by geophysical or geochemical approach independently. The objective of this study is to provide the effective method to detect the saline water intrusion on the ground water in the vicinity of seashore using these two methods. Schulumberger sounding, frequency domain electromagnetic sounding and geochemical analysis of ground water were carried out to explore saline water intrusion. Schulumberger sounding was implemented in dry surface condition before irrigation water was introduced into the field, while electromagnetic sounding was carried out in wet ground condition after the irrigation. The purpose of duplicated measurements on the equivalent spot at different times was to investigate the variation of anomaly zone depending on the amount of ground water. It was possible to discriminate the anomalous zone due to high water saturation from the low electric resistivity zone by high salt concentrations through this way. For the verification of the geophysical result, the ground water samples in the study area were collected and analysed at the 23 points near the measuring spots. The groundwater at the spot nearest to the sea water intrusion identified by geophysical method indicates higher salinity than the standard limit concentration for agricultural irrigation water (250 mg/1). Isotope analysis of $D({^2}H)$ vs. is ${^18}O$ and PCA analysis were used to discriminate the anthropogenic pollution from those of high salinity from sea water intrusion.

• Journal of the Korean Geophysical Society
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• v.3 no.4
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• pp.281-290
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• 2000

This research was carried out in order to give some reasonable solutions on basin tectonics and on continental geodynamics, which are approached by using integrative researches on crustal deformation, 3-D seismic velocity reconstruction and geochemical tracing of volcanic rocks in the eastern China basin system.

• Economic and Environmental Geology
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• v.52 no.5
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• pp.323-336
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• 2019

The Mesozoic activity on the Korean Peninsula is mainly represented by the Triassic post-collisional, Jurassic orogenic, and Cretaceous post-orogenic igneous activities. The diversity of mineralization by each geological period came from various geothermal systems derived from the geochemical characteristics of magma with different emplacement depth. The Cretaceous metallic mineralization has been carried out over a wide range of time periods from ca. 115 to 45 Ma (main stage; ca. 100 to 60 Ma) related to post-orogenic igneous activity, and spatial distribution patterns of most metal deposits are concentrated along small granitic stocks. The late Cretaceous metal deposits in the Gyeonggi and Yeongnam massifs are generally distributed along the boundary among the Gongju-Eumseong fault system and the Yeongdong-Gwangju fault system and the Gyeongsang Basin, most of them are in the form of a distal epithermal~mesothermal Au-Ag vein or a transitional mesothermal Zn-Pb-Cu vein. On the other hand, diverse metal commodities in the Taebaeg Basin, the Okcheon metamorphic belt and the Gyeongsang Basin are produced from various deposit types such as skarn, carbonate-replacement, vein, porphyry, breccia pipe, and Carlin type. In the late Cretaceous metallic mineralization, various mineral deposits and commodities were induced not only by the pathway of the hydrothermal solution, but also by the diversity of precipitation environment in the proximity difference of the granitic rocks. The diversity of these types of Cretaceous deposits is fundamentally dependent on the geochemical characteristics such as degree of differentiation and oxidation state of related igneous rocks, and ore-forming fluids generally exhibit the evolutionary characteristics of intermediate- to low-sulfur hydrothermal fluids.