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Genetic Environment of the Samsung Gold-Silver Deposit, Republic of Korea: Ore Minerals, Fluid Inclusion and Stable Isotope Studies  

Yoo, Bong-Chul (Overseas Mineral Resources Department, Korea Institute of Geoscience and Mineral Resources)
Lee, Gill-Jae (Overseas Mineral Resources Department, Korea Institute of Geoscience and Mineral Resources)
Koh, Sang-Mo (Overseas Mineral Resources Department, Korea Institute of Geoscience and Mineral Resources)
You, Byoung-Woon (Department of geology and environmental sciences, Chungnam National University)
Publication Information
Economic and Environmental Geology / v.43, no.5, 2010 , pp. 443-453 More about this Journal
Abstract
The Samsung gold-silver deposit consists of quartz veins that fill along the fault zone within Cretaceous shale and sandstone. Mineralization is occurred within fault-breccia zones and can be divided into two stages. Stage I is main ore mineralization and stage II is barren. Stage I is associated with wall-rock alteration minerals(sericite, pyrite, chlorite, quartz), rutile, base-metal sulfides(pyrrhotite, pyrite, sphalerite, chalcopyrite, galena), and electrum. Stage II occur quartz, calcite and pyrite. Fluid inclusion data indicate that homogenization temperatures and salinities of stage I range from 145 to $309^{\circ}C$ and from 0.4 to 12.4 wt.% NaCl, respectively. It suggests that hydrothermal fluids were cooled and diluted with the mixing of meteoric water. The main deposition of base-metal sulfides and electrum occurred as a result of cooling and dilution at temperature between $200^{\circ}C$ and $300^{\circ}C$. Sulfur(9.3~10.8‰) isotope composition indicates that ore sulfur was mainly derived from a magmatic source as well as the host rocks. The calculated oxygen[-2.3~0.9‰(quartz: 0.3‰, 0.9‰, calcite: -2.3‰)] and hydrogen[-86~-76‰(quartz: -86‰, -82‰, calcite: -76‰)] isotope compositions indicate that hydrothermal fluids may be meteoric origin with some degree of mixing of another meteoric water for paragenetic time.
Keywords
Samsung gold-silver deposit; mineralization; fluid inclusion; isotope;
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