Mesozoic magmatism and copper polymetallic mineralization processes in the Shanghang-Datian region, Fujian Province, Southeast China

作     者：毛建仁 胡青 许乃政 陈荣 叶海敏 赵希林 

作者机构：Nanjing Institute of Geology and Mineral Resources Nanjing 210016 China GeoligicalPartyofWestFujianProvince(1994)Min-eralogeneticseriesandprospectingtargetareaofZijinshanCu-AudepositinFujianProvince. 

出 版 物：《Chinese Journal Of Geochemistry》 (中国地球化学学报)

年 卷 期：2006年第25卷第3期

页      面：266-278页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：ThisresearchwasfinanciallysupportedbytheChinaGeologicalSurvey(No.1212010611805) 

主　　题：花岗岩 中生代 镁 铜 金属混合物 福建 矿化过程 

摘      要：Various isotopic ages were reported for four granite plutons in the area studied, i.e., the Tangquan pluton (185-158 Ma); the Zijinshan pluton (157-145 Ma); the Caixi pluton (133 Ma); and the Sifang pluton (108-105 Ma). The Tangquan and Zijinshan plutons belong to Early-Middle Jurassic and Late Jurassic of Early-Mesozoic respectively, and the Caixi and Sifang plutons belong to Early-Cretaceous of Late Mesozoic. Both the Tangquan and Sifang plutons, which are the metaluminous granites with A/CNK{1.1}, and possesses the geochemical features of crust-derived muddy materials resultant from partial melting with enrichments in K, Rb, Th, Y, HREE and depletions in Sr, Ba, and Ti. The Caixi pluton is a weakly peraluminous granite with A/CNK={1.0}-{1.1}, and its geochemical characteristics are intermediate between the Zijinshan pluton and the Sifang pluton. The Tangquan pluton with higher Na-2O contents, which resulted from partial melting of Proterozoic thick lower-crust derived basic rocks in response to underplating of mantle-derived basic magma, is one of the major host rocks of the metallogenic series of copper, iron and polymetallic deposits. The Sifang pluton with higher K-2O contents, which was mixed between middle-lower crust-derived granite magma by partial melting and mantle-derived high-K basic magma, giving rise to the increment of K-2O in the melt, and extracted large amounts of copper and other metals, as well as sulphur, is one of the major host rocks of the metallogenic series of porphyry copper, gold and polymetallic deposits. Petrological records have shown that there has occurred lithosphere extension since the Early-Middle Jurassic (180 Ma) in the region, and the formation of Zijinshan peraluminous granite