• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2005.04a
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• pp.332-335
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• 2005

경안천변의 충적층 지하수를 대상으로 농업활동 및 양수에 수반된 지하수 오염과 수리적 변동에 따른 수리지구화학 변화를 연구하였다. 사행하는 경안천에 의해 넓게 형성된 충적층 지역에서는 사계절 비닐하우스 농업이 활발히 이루어지고 있으며, 이를 위해 강변에 설치된 대형 관정을 통하여 지하수를 대량 양수하고 있다. 이러한 상황은 여러모로 강변여과 현장과 흡사하다. 지하수 내 주요 용존 이온의 공간적 분포는 양수에 수반된 수리적 변동과 밀접한 상관관계를 나타내었다. 즉, 대단위 양수에 의하여 충적 지하수계로의 하천수 유입이 가속화되며, 이에 따른 희석 효과에 의해 충적 지하수의 질산염 농도가 감소하는 경향을 보여주었다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2015.10a
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• pp.231-232
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• 2015

• Economic and Environmental Geology
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• v.56 no.6
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• pp.729-744
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• 2023

The value of lithium has significantly increased due to the rising demand for electric cars and batteries. Lithium is primarily found in pegmatites, hydrothermally altered tuffaceous clays, and continental brines. Globally, groundwater-fed salt lakes and oil field brines are attracting attention as major sources of lithium in continental brines, accounting for about 70% of global lithium production. Recently, deep groundwater, especially geothermal water, is also studied for a potential source of lithium. Lithium concentrations in deep groundwater can increase through substantial water-rock reaction and mixing with brines. For the exploration of lithim in deep groundwater, it is important to understand its origin and behavior. Therefore, based on a nationwide preliminary study on the hydrogeochemical characteristics and evolution of thermal groundwater in South Korea, this study aims to investigate the distribution of lithium in the deep groundwater environment and understand the geochemical factors that affect its concentration. A total of 555 thermal groundwater samples were classified into five hydrochemical types showing distinct hydrogeochemical evolution. To investigate the enrichment mechanism, samples (n = 56) with lithium concentrations exceeding the 90th percentile (0.94 mg/L) were studied in detail. Lithium concentrations varied depending upon the type, with Na(Ca)-Cl type being the highest, followed by Ca(Na)-SO₄ type and low-pH Ca(Na)-HCO₃ type. In the Ca(Na)-Cl type, lithium enrichment is due to reverse cation exchange due to seawater intrusion. The enrichment of dissolved lithium in the Ca(Na)-SO₄ type groundwater occurring in Cretaceous volcanic sedimentary basins is related to the occurrence of hydrothermally altered clay minerals and volcanic activities, while enriched lithium in the low-pH Ca(Na)-HCO₃ type groundwater is due to enhanced weathering of basement rocks by ascending deep CO₂. This reconnaissance geochemical study provides valuable insights into hydrogeochemical evolution and economic lithium exploration in deep geologic environments.

• Journal of the Korean earth science society
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• v.22 no.3
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• pp.163-178
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• 2001

Granite gneiss, pophyroblastic gneiss and leucocratic gneiss are widely distributed in the Seungju-Suncheon area, the southwestern part of the Sobacksan Massif, Korea. These orthogneisses show intrusive relationships in outcrops of the study area. This study focuses on the geochemical properties and the tectonic environments for the original rocks of these orthogneisses. The pophyroblastic gneiss is plotted in diorite and granodiorite domain, and granite gneiss and leucocratic gneiss are plotted in both of granodiorite and granite domains on lUGS silica-alkali diagram. Geochemical properies of major elements suggest that these rocks are sub-alkali rock series, and were formed from S-type magma which generated in syn-collision tectonic environment. Discrimination diagrams using HFS elements suggest that original rocks of the three orthogneisses were granitoid of calc-alkali rock series, and were formed in syn-collision environment.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.11a
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• pp.389-390
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• 2000

최근 지구 온난화의 55% 이상을 차지하고 있는 이산화탄소를 유용한 화합물로 전환하고자 메탄을 환원제로 사용한 이산화탄소 개질반응으로부터 합성가스 생성에 관한 연구가 활발히 진행되고 있다. 메탄의 이산화탄소 개질반응은 수증기 개질반응보다 낮은 합성 가스비의 생성, 온실효과를 유발하는 이산화탄소의 저감, 반응의 높은 흡열도를 이용한 화학에너지 전송 시스템의 응용 면에서 그 의의가 있다. (중략)

• Proceedings of the KSEEG Conference
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• 2005.04a
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• pp.294-296
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• 2005

• Proceedings of the KSEEG Conference
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• 2005.04a
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• pp.222-227
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• 2005

• Proceedings of the KSEEG Conference
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• 2007.04a
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• pp.453-455
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• 2007

• Proceedings of the KSEEG Conference
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• 2007.04a
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• pp.471-474
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• 2007

• Proceedings of the KSEEG Conference
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• 2007.04a
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• pp.481-483
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• 2007