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DURING the course of hydrocarbon evolution and migration, large quantities of H_ 2S are often produced.This process is most familiar to petroleum geologists, and may lead to forming of natural gas deposits. Themost important H_2S-forming reactions are bacterial sulfate reduction (BSR), and thermochemical sulfatereduction (TSR). Whereas BSR is restricted to relatively low temperature (<100℃) and shallowdepths, TSR becomes important at elevated temperature (>150℃) and greater depth of burial. BecauseH_2S is highly soluble in water, any groundwater in the vicinity of a TSR-active zone will also become enriched in H_2S. The central hypothesis of this paper is that hot groundwaters associated with TSR in carbonate terrains acquire the ability to transport gold and other elements (e.g. Ag, Hg, As, Sb, Tl) as
DURING the course of hydrocarbon evolution and migration, large quantities of H 2S are often produced. This process is most familiar to petroleum geologists, and may lead to forming of natural gas deposits. Themost important H 2 S-forming reactions are bacterial sulfate reduction (BSR) , and thermochemical sulfate reduction (TSR). Whereas BSR is restricted to relatively low temperature (<100 ° C) and shallow depths, TSR becomes important at elevated temperature (> 150 ° C) and greater depth of burial. in the vicinity of a TSR-active zone will also become enriched in H_2S. The central hypothesis of this paper is that hot groundwaters associated with TSR in carbonate terrains acquire the ability to transport gold and other elements (eg Ag, Hg, As, Sb , Tl) as