桂东北地区几个加里东期花岗岩体的地球化学特征及其构造环境判别  

Judging for characterstics of geochemical and structural environment of several caledonian granitoids in northeast Guangxi

作　　者：李文杰[1] 梁金城[2] 冯佐海[2] 张桂林[2] 陈懋弘[3] 袁爱平[4] 

机构地区：[1]西南科技大学资源与环境学院,四川绵阳621010 [2]桂林工学院资源与环境工程系,广西桂林541004 [3]中国地质科学院矿产资源研究所,北京100037 [4]北京科技大学土木与环境工程学院,北京100083

出　　处：《矿产与地质》2006年第4期353-360,共8页Mineral Resources and Geology

基　　金：国土资源大调查配套项目(桂地矿科2001.5号);广西自然科学基金项目(桂科自0229055)资助

摘　　要：通过对该区花岗岩的常量元素、稀土元素及微量元素成分分析对比,利用岩石化学特征并结合岩体产出地质条件,对花岗岩形成的构造环境进行了综合判别。提出桂东北花岗岩具有相同的成因和来源,属同一岩浆结晶分异演化而来。结晶分异作用为花岗岩的主要成岩方式。越城岭、苗儿山和海洋山岩体主要形成于同碰撞的挤压构造环境下,而大宁岩体总体构造环境为处于碰撞前向同碰撞转换的挤压构造环境。By comparison and compositional analysis of major, rare earth and trace elements of the granitoids in the region, a comprehensive discriminant analysis on the structural environment for granite forming was made , by use of rock geochemistry and combined with the granite forming geological condition. It is proposed that the granitoids in northeast Guangxi possess same genesis and source, which came from the same magmatic crystallization differentiation in Northeast Guangxi. Crystallization differentiation for granite is the main diagenesis mode. Yue Chengling , Miao Ershan and Hai Yangshan granitic rocks were mainly formed in syngenetic collision environment, whereas Da Ning granitic rock is from pre-plate collision to collision environment.

关 键 词：花岗岩 构造环境 综合判别 地球化学 加里东期 桂东北 

分 类 号：P588.1[天文地球—岩石学]