Econ. Environ. Geol. 2010; 43(5): 443-453

Published online October 31, 2010

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

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

Bong Chul Yoo1*, Gill-Jae Lee1, Sang-Mo Koh1 and Byoung Woon You2

1Overseas Mineral Resources Department, Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, Korea
2Department of geology and environmental sciences, Chungnam National University, Daejeon, 305-764, Korea

Correspondence to :

Bong Chul Yoo

chbong@kigam.re.kr

Received: September 19, 2010; Accepted: October 20, 2010

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 309oC 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 200oC and 300oC. 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

Article

Econ. Environ. Geol. 2010; 43(5): 443-453

Published online October 31, 2010

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

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

Bong Chul Yoo1*, Gill-Jae Lee1, Sang-Mo Koh1 and Byoung Woon You2

1Overseas Mineral Resources Department, Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, Korea
2Department of geology and environmental sciences, Chungnam National University, Daejeon, 305-764, Korea

Correspondence to:

Bong Chul Yoo

chbong@kigam.re.kr

Received: September 19, 2010; Accepted: October 20, 2010

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 309oC 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 200oC and 300oC. 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

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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