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《GEOTECTONICA ET METALLOGENIA》 1997-04
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ON THE METALLOGENETIC MECHANISM OF THE ALKALI-RICH PORPHYRIES IN CENTRAL YUNNAN

LAI Jianqing; PENG Shenglin; WANG He; SHAO Yongjun(Department of Geology, Central South University of Technology, Changsha 410083)  
The alkali-rich porphyries in Yunnan formed by separated melting of the source-rock inthe depth of the crust that consisted of crustal material and mantle-source ultrabasic rocksintruded into continental crust before. The source for the metallogenesis related to theporphyries was mainly magma, which included fluid phase from the depth, crust- andmantlesource showed by lead isotopic data,and maybe inferred there was an abnormal upper-mantlein this district. Multidisciplinary analysis of geology and geochemistry indicates that copperand gold were mantle originated,lead and zinc were continental crust originated, and theywere further enriched by source-rock remelting and magmatic evolution. Among all thetectonic units, there are two metallogenetic subserials related to different alkali-rich porphyryfeatures and metallogenesis resulting from different crust/mantle ratio and remelting fractionof the source-rock.
【Fund】: 国家自然科学基金;;国家教委博士点专项基金
【CateGory Index】: P611
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