Dissolution and Migration of Au in Hydrothermal :Ore Deposit: A Review
Received date: 2012-03-19
Revised date: 2012-05-25
Online published: 2012-08-10
Au-S and Au-Cl complexes are the two main hydrothermal species that transport gold. The species Au(HS)-2 is dominant in near neutral solution while complexes such as Au(H2S)HS0 with twofold stoichiometry may be important in acidic conditions. In solution with low sulfur and high chloride concentration, AuCl-2 is predominant under elevated temperatures. In contrast, some other neutral compounds like AuCl0，AuS·(H2O)m are suggested to distribute in gaseous fluids with respect to high-temperature circumstances (e.g. volcanic exhalation). The promoted ore fluid’s capacity to retain gold in solution over large transport distances involved could be explained by the mechnism that gold is likely to dispersing and precipitating in soution by colloid grains. Moreover, gold has the potential to comigrate with As and Sb, which combine with Au and S to shape Au-S-As and Au-S-Sb compound complexes, respectively. Future prospects for study on dissolving and migrating of gold are suggested to focus on realizing the truth of gold ore-forming geologically, improving experimental apparatuses, complementing thermodynamics parameters, and investigating kinetics of metaldissolving reactions, as well as subjects about gold transporting by vapour compounds and surface-driven process.
Key words： Hydrothermal gold ores; Dissolving; ; Migrating; Complex
Liu Hong , Zhu Jiang , Yang Enlin , Hu Qingcheng , Lü Xinbiao , Gao Qi . Dissolution and Migration of Au in Hydrothermal :Ore Deposit: A Review[J]. Advances in Earth Science, 2012 , 27(8) : 847 -856 . DOI: 10.11867/j.issn.1001-8166.2012.08.0847
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