%0 Journal Article
%T The Mesozoic rock-forming and ore-forming processes and tectonic environment evolution in Shanghang-Datian region, Fujian<br>福建省上杭-大田地区中生代成岩成矿作用与构造环境演化
%A MAO JianRen
%A XU NaiZheng
%A HU Qing
%A XING GuangFu
%A YANG ZhuLiang Najing Institute of Geology
%A Mineral Resources
%A Chinese Academy of Geological Sciences
%A Nanjing
%A China
%A <br>毛建仁
%A 许乃政
%A 胡青
%A 邢光福
%A 杨祝良
%J 岩石学报
%D 2004
%I 
%X There are various isotopic ages for four granitic plutons in the studied area, which respectively are as fo llows: Tangquan pluton 185 ~158Ma; Zijinshan pluton 157 ~145Ma; Caixi pluton 133Ma; Sifang pluton 108 ~ 105. Tangquan and Zijinshan plutons are belonged to respectively Early-Middle-Jurassic and Late-Jurassic in Early-Mesozoic, and Caixi and Sifang plutons belong to Early-Cretaceous in Late-Mesozoic. Both Tangquan and Sifang plutons, which are the metaluminous granites with A/CNK < 1. 0, are regarded to possess the geochemical characteristics of adakite rich in Sr, Ba and poor in HREE, Y, Yb, as the most potential host rocks of ore-bearing for the copper deposit. Zijinshan pluton is regarded as peraluminous granites with A/CNK > 1. 1 , and possesses the geochemical feature of crust-derived mud materials by partial melting with enrichment in K, Rb, Th, Y, HREE and depletion in Sr, Ba, Ti. Caixi pluton is weak-peraluminous granites with A/CNK = 1. 0 ~ 1. 1, and its geochemical feature lies between the Zijinshan pluton and Sifang pluton. Tangquan pluton with higher Na2O content, which was formed by partial melts of the thickened lower-crust derived basic rock during Proterozoic, resulting from the underplating of mantle-derived basic magma, is the major host rocks of the metallogenic series of copper, iron and multiple metals deposits. Sifang pluton with higher K2O content, which was mixed between middle-lower crust-derived by granite magmas partial melting and mantle derived basic magma with high K, resulted in increase of K2O content in the melt and obtaining of a large amount of copper, other metals and sulphur from mantle, is the major host rocks of the metallogenic series of the porphyry copper, gold and multiple metal deposits. There have been the petrological records of lithosphere extension since Early-Middle-Jurassic (180Ma) in the region, and formation of Zijinshan peraluminous granites is resulted from the extension mechanism. With the time past, the lithosphere extension-thinning and underplating is increased gradually, meanwhile the contribution of mantle to granite formation is increased gradually.
%K Granites
%K Mesozoic
%K Ore-forming processes
%K Tectonic environment
%K Southwestern Fujian<br>花岗岩类
%K 中生代
%K 成矿作用
%K 构造环境
%K 闽西南地区
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=5907A2BF7CA4AE54&yid=D0E58B75BFD8E51C&vid=A04140E723CB732E&iid=0B39A22176CE99FB&sid=B8F8200D88DDC7D6&eid=D0182A31A5EB14BA&journal_id=1000-0569&journal_name=岩石学报&referenced_num=21&reference_num=82