%0 Journal Article
%T Petrogenesis of the Gaofengshan granite in Gejiu area, Yunnan Province: Zircon U-Pb dating and geochemical constraints<br>云南个旧高峰山花岗岩成因:锆石U-Pb年代学及地球化学约束
%A LI XiaoLong
%A MAO JingWen
%A CHENG YanBo
%A ZHANG Juan
%A <br>李肖龙
%A 毛景文
%A 程彦博
%A 张娟
%J 岩石学报
%D 2012
%I 
%X The Gaofengshan granite is located in the eastern part of the Gejiu ore district,Yunnan Province.The lithology of the granitoid is mainly medium grained biotite monzonitic granite.In this paper,zircon U-Pb dating and geochemistry of the Gaofengshan granite is studied to constrain its geochronology and petrogenesis.Zircon LA-ICP-MS dating yields an emplacement age of 85.76±0.58Ma,which suggests that this granite formed in the Late Cretaceous.Geochemically,this granite is silica riched in composition, with high content of alkali(Na 2 O+K2 O).It’s a metaluminous to peraluminous granite and belongs to the high-K calc-alkaline series, and characterized by enrichment of Rb,U,Ta,Pb,Nd and depletion of Ba,Nb,Sr,P,Zr,Eu,Ti.The abundance of∑REE varies in the range of 146.7×10 -6 to 236.1×10 -6 ,and it has intensely negative Eu abnormality(δEu=0.03～0.11).What’s more,it reflects a tetrad-like effect with a shape of"M".These features are coincident with A2 granite.Geochemical characteristics show that the parental magma of the Gaofengshan granite was derived from the partial melting of crust,and experienced a strong crystal fractionation process.New data of this study indicate that the Gaofengshan granite was one component of the large scale Late Cretaceous magmatism in western Cathaysia block,which viewed as under a regional lithospheric extension tectonic setting.
%K Gaofengshan granite
%K Zircon U-Pb age
%K Geochemistry
%K Petrogenesis
%K Gejiu area
%K Yunnan Province<br>高峰山花岗岩
%K 锆石U-Pb年龄
%K 地球化学
%K 岩石成因
%K 云南个旧
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=2196949E2245EB607785D4B1359F6319&yid=99E9153A83D4CB11&vid=D3E34374A0D77D7F&iid=CA4FD0336C81A37A&sid=DD74772618543076&eid=FEF02B4635FE8227&journal_id=1000-0569&journal_name=岩石学报&referenced_num=0&reference_num=122