A preliminary discussion on the geochemical role of country-rock media in cassiterite-polymetallic sulphide mineralization,Dachang ore field,Guangxi, China |
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Authors: | Ye Xusun Yan Yunxiu |
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Institution: | (1) Prospecting Team No. 215, Guangxi Geological Exploration Co., China |
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Abstract: | Our metallogenic studies of the Dachang ore field show that the country-rock media have great influence on the process of
mineralization. They can not only contribute part of the ore-forming material, but also have influence on the geochemical
evolution of granitic magma and ore fluids. The Dachang ore field can be taken as a typical example to show the influence
of country-rock media on mineralization. Geological field investigations indicate that where granites intruded weakly alkalic
country rocks (e.g. middle Devonian limestones and silicorites of platform facies in the Dachang), instead of carbonaceous
shales of reducing basin facies, Sn would be able to enter rock-forming minerals in large quantities to form cassiterite-sulfide
ore deposits of commercial value. So, it may be concluded that the process of magmatic differentiation-evolution, mineralization
and tectonic settings of ore deposits are, more or less, controlled by their country-rock media. |
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