Compositional characteristics of garnets and pyroxenes in contact-metasomatic skarn deposits and their relationship with metallization |
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Authors: | Zhao Bin M D Barton |
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Institution: | (1) Institute of Geochemistry, Academia Sinica, Guiyang;(2) University of California, 90024 Los Angeles, CA, USA |
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Abstract: | The compositions of more than 300 granets and pyroxenes from 14 contact-metasomatic calcic skarn deposits and calcic-magnesia
skarn skarn deposits in China have been examined using electron microprobe technique. The compositions of garnets and pyroxenes
from a wide variety of ore types represent ten major classes of calcic skarn deposits (Fe, Fe-Cu, Pb-Zn,W, Sn, Sn-Mo-Bi-W,
W-Bi-Cu-Mo, Cu-Zn and W-Zn-Cu) and three major classes of calcic-magnesia skarn deposits (Fe-Cu, Mo, Pb-Zn). Garnets and pyroxenes
show a wide range of variation in composition, but the majority of garnets are grossular-andradite solid solutions containing
less than 15 mol% (spessartine + almandine + pyrope), whereas most pyroxenes are diopside-hedenbergite solid solutions containing
less than 5 mol% johannesenile. Some pyroxenes from a Pb-Zn calcic-magnesia skarn deposit display an increase in Mn content.
Only Sn-W calcic skarn deposits and Pb-Zn calcic-magnesia skarn deposits contain garnets with more than 15 mol% (spessartine
+ almandine + pyrope). Some relationships have been established between the compositions of garnets and pyroxenes and the
metallization types of economically important metals in skarn deposits. |
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