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- W4252365632 abstract "The Mandongshan gold deposit, located in the west Junggar (Xinjiang, China), is hosted in Early Carboniferous basalt and tuff. Ore bodies mainly consist of gold-bearing hydrothermal veins, mineralized basalt and tuff with disseminated sulfides. Hydrothermal process could be identified based on ore petrographic studies: quartz-albite-sulfide-native gold (stage I), arsenopyrite-calcite-native gold (II), and pyrite-calcite (III). Microthermometric and laser Raman spectroscopic analysis of fluid inclusions in quartz demonstrate the ore-forming fluid at stage I was moderate temperature (360–398 °C), low-salinity (0.5–5.1 wt% NaCl equiv), and H2O-CH4-dominant, which evolved to low-salinity (0.2–1.2 wt% NaCl equiv) with insignificant content of CH4 at 219–267 °C (stage III). Contents of ore elements (As, Au, Cu, Sb, Ba, Cs, Rb) in mineralized basalt are higher than those in fresh basalt. Phase analysis for the Au-As-Fe-S system using SUPCRT92 software package with the updated database of slop98.dat indicates that a decrease of H2S activity and oxygen fugacity, caused by phase separation and fluid-rock reactions, induced native gold precipitation at stage I. The decrease of H2S activity triggered by arsenopyrite crystallization caused native gold deposition at stage II." @default.
- W4252365632 created "2022-05-12" @default.
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- W4252365632 date "2017-04-01" @default.
- W4252365632 modified "2023-10-14" @default.
- W4252365632 title "Book review" @default.
- W4252365632 doi "https://doi.org/10.1016/j.oregeorev.2016.12.005" @default.
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