Relations between A-type granites and copper mineralization as exemplified by the Machangqing Cu deposit |
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Authors: | BI Xianwu HU Ruizhong YE Zaojun SHAO Shuxun |
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Institution: | Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China |
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Abstract: | This paper deals with the relations between the Machangqing rockbody which corresponds to the A-type granites and porphyry
copper mineralization in terms of petrochemistry, trace element geochemistry, fluid inclusion geochemistry and isotope geochemistry.
The results show that the Machangqing porphyry copper deposit was formed from the fluid predominated by mag-matic fluid. This
kind of ore-forming fluid was just differentiated from the magma responsible for the A-type granites. Therefore, as viewed
from whether they contain water or not, the A-type granites can, at least, be divided into two types: water-bearing and water-free.
The water-bearing A-type granites can serve as the host of porphyry copper deposits under certain geological conditions. |
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Keywords: | porphyry copper deposit A-type granite magmatic fluid |
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