http://www.sciencedirect.com/science/article/pii/S1674987111000430 |
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| Authors: | Yongfeng Zhu Fang An Juanjuan Tan |
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| Institution: | Key Laboratory of Orogenic Belts and Crustal Evolution of Ministry of Education, School of Earth and Space Sciences,Peking University, Beijing 100871, China |
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| Abstract: | Mineral assemblages formed during hydrothermal alteration reflect the geochemical composition
of ore-forming fluids. Gold is mainly transported in solution as AueCl and AueS complexes. The
change of physicochemical conditions such as temperature, pressure, oxygen fugacity, and sulfur fugacity
are effective mechanisms for gold precipitation. Gold tends to be concentrated in the vapor phase of fluids
at high temperatures and pressures. AueAs and AueSb associations are common in gold deposit. Native
antimony and/or arsenic e native gold assemblages may precipitate from hydrothermal fluids with low
sulfur fugacity. Hydrothermal fluids forming epithermal gold deposits are Au-saturated in most cases,
whereas fluids of Carlin-type are Au-undersaturated. Quasi-steady As-bearing pyrite extracts solid solution
Au from hydrothermal fluids through absorption. The capability of As-bearing pyrite to absorb Au
from under-saturated fluid is the key to the formation of large-scale Carlin-type deposits. With increasing
new data, studies on the geochemistry of gold deposits can be used to trace the origin of ore-forming
fluids, the source of gold, and the transporting form of Au and other ore-forming elements, such as Si,
S, F, Cl, As and Ag. |
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| Keywords: | Geochemistry Hydrothermal fluid Alteration Gold deposits |
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