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http://dx.doi.org/10.9719/EEG.2020.53.3.221

Studies on Fluid Inclusion and Pyrite Geochemistry in the Moisan Au-Ag Deposit, Haenam District, Korea  

Park, Sol (Department of Energy and Resources Engineering, Inha University)
Seo, Jung Hun (Department of Energy and Resources Engineering, Inha University)
Kim, Chang Seong (PrimoResource Ltd.)
Yang, Yoon-Seok (Department of Energy and Resources Engineering, Inha University)
Oh, Jihye (Division of the Deep-Sea Mineral Resources Research Center, Korea institute of Ocean Science & Technology)
Kim, Jonguk (Division of the Deep-Sea Mineral Resources Research Center, Korea institute of Ocean Science & Technology)
Publication Information
Economic and Environmental Geology / v.53, no.3, 2020 , pp. 221-234 More about this Journal
Abstract
We occur together with telluride minerals. Fluid inclusions in the euhedral quartz crystals are mainly aqueous liquid-rich inclusions, which have salinities about 0.18-2.24 wt% NaCl equivalent. Some quartz vein contains aqueous vapor-rich inclusions as well. Homogenization temperatures of the assemblages of the liquid-rich inclusions are about 141-384 ℃, and the temperatures are lower at the shallower vein samples. In the high Au-Ag grade depth intervals, relatively deeper fluids have relatively higher salinities and homogenization temperatures, while shallower fluids show somewhat wider ranges. These might indicate that the deep Au-Ag bearing hydrothermal fluids at the Moisan area experienced phase separation as well as mixing with meteoric water by decreasing pressure. Au-Ag precipitation in the Moisan deposit is not associated with pyrite, but pyrite include Au-Ag bearing phase as an inclusion, which might possibly be tellurides or electrum. Au/Ag ratios in the Au-Ag bearing phase do not change with different depth.
Keywords
Moisan; Haenam; epithermal deposit; fluid inclusion; pyrite; LA-ICP-MS;
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