The solubility of a metallic mineral with other coexisting minerals and the ore-forming processes of metallic sulfides |
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| Authors: | Kuang Cen and Chongwen Yu |
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| Institution: | China University of Geosciences, Beijing 100083, China |
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| Abstract: | Most metallic minerals in ore deposits are sulfides. When a sulfide mineral coexists with rock-forming minerals, its solubility
is distinctly different from itself alone. The change in dissolution character of a mineral with coexisting rock-forming minerals
leads to particular geochemical behavior. The concept of solubility of a metallic mineral with coexisting rock-forming minerals
and its theory and model of calculation are put forward. Taking Tianmashan Cu-Au ore deposit of sulfide minerals in Tongling
district as an example, solubilities of some metallic minerals with other coexisting minerals, such as pyrite or chalcopyrite
with quartz (representing sandstone) or calcite (representing limestone), are calculated. The results show the mechanism of
ore-forming processes. As the ore-forming fluid flows through sandstone, it dissolves pyrite in the sandstone at first, then
transports the iron and sulfur to the interface between sandstone and limestone and eventually precipitates them on the interface. |
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| Keywords: | metallic mineral coexisting mineral solubility ore-forming process |
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