新疆北山石炭纪、二叠纪火山岩岩石化学及其构造环境分析  

ROCK CHEMISTRY AND ANALYSIS OF ITS STRUCTURAL ENVIRONMENT FOR CARBONIFEROUS -PERMIAN VOLCANICS IN BEISHAN , XINJIANG

作　　者：陈升平[1] 朱云海[1] 

机构地区：[1]中国地质大学地质系

出　　处：《地球科学（中国地质大学学报）》1992年第6期647-656,共10页Earth Science-Journal of China University of Geosciences

摘　　要：北山地区火山岩发育,空间上呈线性分布,以熔岩和凝灰岩为主。岩性组合为玄武岩、安山岩、流纹岩。成分一般富镁、贫钾,以钙碱性系列为主。岩石指数:CA、σ和τ、Fe—Mg—Al_2O_3图解、微量元素和稀土元素、同位素特征都表明岩浆来源于上地幔的部分熔融,岩浆上升演化过程中遭受部分混染作用,是造山带岩浆作用产物。Volcanic rocks are well developed in Beishan , mainly consist of lava and tuff, and are distributed linearly . They are basalt , andesite and rhyolite , and rich in Mg , lack of K in chemical composition . All the characteristics of rock index , CA , σ and τ , diagram of Fe-Mg-A12O3 ,trace elements , REE and isotope show that the magma derived from partial melting of the upper mantle and has been partly contaminated during the process of the lift evolution . Volcanics in Beishan is the result of magmatism in erogenic zone .

关 键 词：火山岩 岩石化学 微量元素 同位素 

分 类 号：P584[天文地球—岩石学]