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《Geology in China》 2008-06
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The adakite and mineralization of the Shaxi porphyry copper-gold deposit,Central Anhui

YU Liang-fan1,YANG Xiao-yong2,SUN Wei-dong2,3,CHI Yue-yu4,ZHANG Qian Ming4(1.The Public Geological Survey Management Center of Anhui Province,Hefei 230001 Anhui,China;2.Center of Mineral Resources,University of Science and Technology of China,Hefei 230026 Anhui,China;3.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640 Guangdong,China;4.No.327 Geological Party of Anhui Province,Hefei 230011 Anhui,China)  
Adakites are intermediate to felsic igneous rocks,andesitic to rhyolitic in composition(basaltic members are lacking).They have trondhjemitic affinities(high-Na2O contents and K2O/Na2O 0.5) and their Mg no.(0.51),high contents of Ni(20×10-6-40×10-6) and Cr(30×10-6-50×10-6) contents are higher than in typical calc-alkaline magmas.Sr contents are high(300 ×10-6,until 2000 ×10-6) and REE show strongly fractionated patterns with very low heavy REE(HREE) contents(Yb≤1.8×10-6,Y≤18 ×10-6).These rocks are depleted in Nb and Ta compared with other igneous rock.The tectonic formation of adakites are still disputed at present,the points of views are:1) the melting of young oceanic crust during the subduction;2) delamination or foundering of dense mafic lower crust rocks(e.g.,eclogite and garnet pyroxenite) in mafic lower crust to the mantle during continental orogenesis.Consequently,the Fe-Cu-Mo mineralization is closed related to the formation of adakites.On detailed review of geochemical data and geological environment in Shaxi porphyry Cu-Au deposit(central Anhui),we fund the close link between adakite and the regional Cu-Au mineralization.The mineralized model for Shaxi porphyry Cu deposit can be explained by the subduction of the western Pacific plate in the early Cretaceous,whose process released large ion lithophile element(LILE)-rich fluids rise up into the mantle wedge,inducing both its metasomatism and partial melting,trigger a large mount of Cu-Au and fluids materials to the crust environment and melting the subduction plate formed the adakitic assemblage and Shaxi porphyry Cu-Au deposit.
【Fund】: 中国科学院知识创新工程重大项目(KZCX1-YW-15);; 科技部973项目(2006CB403500);; 安徽省公益地质找矿项目资助
【CateGory Index】: P588.1
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