• 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.

• Journal of the Korean GEO-environmental Society
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• v.7 no.6
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• pp.35-44
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• 2006

Various geophysical methods and geological survey were applied for prospecting of geothermal resources and the attitude of volcanic body at northern part of Kumseongsan, Euiseong. They include magnetic, self-potential, radioactive and resistivity methods, temperature logging near the earth's surface and geological survey. The results of this study are summarized as follows. Various geophysical anomalies is related to the geologically Cretaceous conduit. Anomalies of resistivity and temperature logging seem to be related to the geological structure and terrestrial heat. Small radioactive and self-potential anomalies seem to be associated with chemical character of rocks. The sedimentary rocks dip steeply toward the volcanic rocks, aquifuge. Ideal geological structure for bearing ground water and geothermal resources was founded in the study area. The study area and the adjacent two hot springs area consist of Cretaceous sedimentary and volcanic rocks, and have similar geology.

• Economic and Environmental Geology
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• v.50 no.6
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• pp.423-433
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• 2017

Korea Institute of Geoscience and Mineral Resources and Department of Geological Survey and Mineral Exploration in Myanmar have explored the Kalaymyo chromitite deposit, Myanmar since 2013. It is now necessary to find a geochemical indicator for efficient mineral exploration in the future and building a 3D geological model for this ore deposit. Mantle podiform chromitite is a major type of Cr ore in this region, which is considered to be formed by mantle-melt interaction beneath the mantle-crust boundary of oceanic lithosphere. In this study we measured major element composition of spinels in harzburgite, dunite and chromitite, and examined the hypothesis that spinel Cr#(molar Cr/(Cr+Al)${\times}$100) can be used as a geochemical indicator in exploration for the Kalaymyo chromitite. The results show that there is a clear correlation between spinel Cr# and distribution of chromitite. The spinel Cr# of harzburgite increases with decreasing the distance from the chromitite bodies. The spinel composition is also closely associated with texture and occurrence of spinels. The high Cr# spinels (30-48) are subhedral to euhedral and enclosed by olivine whereas the low Cr# spinels (16-27) are anhedral and commonly associated with pyroxenes. Often the low Cr# spinels show symplectite intergrowths with pyroxenes, indicating their residual nature. These petrological and geochemical results suggest that the high Cr# spinels have resulted from mantle-melt interaction. We suggest that spinel Cr# can be used as a geochemical indicator for Cr ore exploration and as one of critical factors in 3D geological model in the Kalaymyo chromitite deposit.

• Economic and Environmental Geology
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• v.12 no.3
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• pp.127-146
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• 1979

Though tungsten minerals have been mined for over fifty years in Korea, which has become one of the worlds largest tungsten producers since 1951, knowledge of their mineralogy and geochemistry is somewhat limited to the school of tungsten students. There is a considerable amount of literature throughout the world on the tungsten mineralogy, the geochemical behaviour of tungsten, the nature of tungsten deposits and geological environments for tungsten mineralisation. Commonly known tungsten minerals such as scheelite and wolframite belong to one of two series, the scheelite or the wolframite series, as the primary tungsten minerals. Secondary tungsten minerals are known rather rare, however, some of them plays an important role-of exploration guide in search for tungsten deposits. The geochemistry of tungsten is imperfectly known, and apparently the behaviour of tungsten in geological processes has been the subject of few studies. Recently, some aspects of the fundamental geochemistry of tungsten has been worked out and compiled the data in broad the up to date by many authors. In order to facilitate the better understanding and future exploration of tungsten deposits, an attempt has been made to summarise the existing knowledge of the fundamental geochemistry of tungsten, together with its common geochemical association with various types of tungsten deposits.

• 한국지구물리탐사학회:학술대회논문집
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• 2004.08a
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• pp.104-117
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• 2004

Dmitri Donskoi, which went down during the Russo-Japanese War occurred 100 years ago, was found by using geophysical exploration techniques at the 400 m water depth of submarine valley off Jeodong of Ulleung Island. In the submarine area with the rugged seabed topography and volcanic seamounts, in particular, the reliable seabed images were acquired by using the mid-to-shallow Multibeam exploration technique The strength of corrosion (causticity) of the sunken Donskoi, measured by the electrochemical method, decreased to 2/5 compared with the original strength.

• 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.

• Geophysics and Geophysical Exploration
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• v.10 no.4
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• pp.361-368
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• 2007

In this paper, we suggested the relationship between resistivity of coastal groundwater and NaCl equivalent salinity for the quantitative interpretation the results of surface/borehole resistivity and electromagnetic data. 38 groundwater samples having electrical conductivity higher than about 1,000 ${\mu}S/cm$ were analyzed to derive the empirical relationship between groundwater resistivity and NaCl equivalent salinity. We used Schlumberger chart GEN-8 to convert ion concentration from hydrochemical analysis to the equivalent NaCl salinity, and the portable meter to measure the in situ electrical conductivity of groundwater samples. From the hydrochemical analysis, relationship between the groundwater resistivity $(R_w)$ and equivalent NaCl salinity (Eq_NaCl) is expressed as Eq_NaCl=$5935.3551{\times}R_w^{-1.0993}$, and relationship between the groundwater electrical conductivity (EC) and total dissolved solids (TDS) is expressed as TDS=0.721*EC. We believe these relationships are very useful to assess the seawater intrusion in western and southern coastal area.

• Spatial Information Research
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• v.12 no.3
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• pp.275-283
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• 2004

In order to effectively, and accurately assess seawater intrusion in coastal area, multidisciplinary data including geophysical, well logging, and hydrogeochemical data should be managed in systematical way. Such systematical management of data is critical key to improve the re-usability of the data as well as the accuracy of the assessment by means of providing a method of synthetic analysis. Therefore, for systematical management of multidisciplinary data in seawater intrusion problem, we have developed a database management system and 3-D visualization interface based on geographic information system in this, study. All geophysical survey, well logging, hydrochemical, as well as drilling, data are classified as attribute data using Microsoft Access, and joined with spatial information based on ArcView. The database management system and 3-D visualization interface to handle these data, also, developed using the script language of ArcView. We think the development of database and 3-D visualization system will improve the efficiency of data management, user-friendliness of data access, and accuracy of data analysis.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.104.2-104.2
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• 2012

미국, 중국, 일본, 인도 등과 같은 세계 여러 국가들이 달 및 화성 탐사를 수행하고 있는 현시점에서 우리나라도 2025년에 달 탐사를 계획하고 있다. 인간에게 있어서 우주공간은 고에너지 환경의 영향을 많이 받는 곳이다. 향후 달, 화성과 같은 다른 행성으로의 이주를 생각하고 있는 현 시점에서 우리는 고에너지우주방사선 환경의 영향을 고려해야 한다. 지구에서의 인간은 지구 자기장과 대기에 의해 고에너지 우주선 환경으로부터의 영향을 덜 받는다. 그러나 달과 화성의 경우는 다르다. 달의 대기는 거의 없고 자기장도 무시할 정도로 매우 작으며, 화성 또한 자기장이 거의 없으며 대기 또한 얇아서 Galactic Cosmic Ray (GCR)나 Solar Energetic Proton (SEP) 등으로부터 인간은 많은 영향을 받을 수 있다. 이러한 위험으로부터 인간이 보호받을 수 있는 곳은 달과 화성의 지표 아래나 동굴이라고 볼 수 있다. 그래서 달 및 화성의 표면과 지하 영역에 대한 고에너지 우주선 환경의 깊이에 따른 영향을 분석하여 어느 정도로 두터운 천장을 가진 동굴이어야 우주인들이 상주하는 지하공간을 지구표면에서의 방사선 환경과 같은 수준으로 유지할 수 있는지를 추정해 보려고 한다. 달 표면 토양의 화학적 구성성분은 Maria와 Highlands로 구분되어 약간의 차이가 있다. 달의 Maria 토양은 $SiO_2$ - 45.4%, $Al_2O_3$ - 14.9%, CaO - 11.8%, FeO - 14.1%, MgO - 9.2%, $TiO_2$ - 3.9%, $Na_2O$ - 0.6%이고 Highlands의 토양은 $SiO_2$ - 45.5%, $Al_2O_3$ - 24.0%, CaO - 15.9%, FeO - 5.9%, MgO - 7.5%, $TiO_2$ - 0.6%, $Na_2O$ - 0.6%의 화학적인 구성비를 가진다. 또한 화성표면은 $SiO_2$ - 43.9%, $Al_2O_3$ - 8.1%, CaO - 6.0%, FeO - 18.1%, MgO - 7.1%, $Na_2O$ - 1.4%의 토양의 화학적인 구성비를 가지고 있다. 본 연구에서는 이러한 구성비를 가지고 있는 달과 화성 표면에 대한 우주방사선의 영향을 분석하기 위해서 GEANT4를 사용하여 수행한 전산 모사의 결과를 발표할 것이다.

• The Journal of the Petrological Society of Korea
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• v.13 no.1
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• pp.16-33
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• 2004

By relating mineralogy, petrology and geochemistry to observed magnetic properties, an understanding of the geological factors that control magnetic signatures is obtained. Magnetic susceptibility measurements and geochemical analyses were carried out for 160 samples in the Jurassic to Cretaceous granitoids, which is distributed to Pocheon, Jipori, Geumsan, Namwon, Songnisan, Yongdam, Masan, Jindong, and Taebaeksan areas. The magnetic properties of igneous infusion in these granites reflect bulk rock composition, reduction-oxidation state, hydrothermal alteration which are controlled by tectonic setting, composition and history of the source region, depth of emplacement and nature of wall rocks.