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Ore Minerals, Fluid Inclusion and Stable Isotope Studies of the Bongsang Gold-silver Deposit, Republic of Korea  

Yoo, Bong-Chul (Department of geology and environmental sciences, Chungnam National University)
Lee, Jong-Kil (Department of geology and environmental sciences, Chungnam National University)
Lee, Gil-Jae (Department of geology and environmental sciences, Chungnam National University)
Lee, Hyun-Koo (Department of geology and environmental sciences, Chungnam National University)
Publication Information
Economic and Environmental Geology / v.41, no.1, 2008 , pp. 1-14 More about this Journal
Abstract
The Bongsang gold-silver deposit consists of quartz veins that fill along the fault Bone within Cretaceous andesitic lapilli tuff. Mineralization is occurred within fault-breccia zones and can be divided into two stages. Stage I which can be subdivided into early and late depositional stages is main ore mineralization and stage II is barren. Stage I began with deposition of wall-rock alteration minerals and base-metal sulfides, and was deposited by later native silver, Ag-bearing tetrahedrite, polybasite and base-metal sulfides such like pyrite, sphalerite, chalcopyrite and galena. Fluid inclusion data indicate that homogenization temperatures and salinities of stage I range from 137 to $336^{\circ}C$ and from 0.0 to 10.6 wt.% NaCl, respectively. It suggests that ore forming fluids were cooled and diluted with the mixing of meteoric water. Also, temperature and sulfur fugacity deduced mineral assemblages of late stage I are $<210^{\circ}C\;and\;<10^{-15.4}$ atm, respectively. Sulfur(3.4%o) isotope composition indicates that ore sulfur was mainly derived from a magmatic source as well as the host rocks. The calculated oxygen{2.9%o, 10.3%o(quartz: 7.9%o, 8.9%o, calcite: 2.9%o, 10.3%o)}, hydrogen(-75%o) and carbon(-7.0%o, -5.9%o) isotope compositions indicate that hydrothermal fluids may be meteoric origin with some degree of mixing of another meteoric water for paragenetic time.
Keywords
Bongsang gold-silver deposit; Mineralization; Fluid inclusion; Isotope;
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