新疆北山石炭纪、二叠纪火山岩岩石化学及构造环境分析  

PETROCHEMISTRY AND STRUCTURAL ENVIROMENT OF CARBONIFEROUS AND PERMIAN VOLCANICS IN BEISHAN, XINJIANG

作　　者：朱云海[1] 陈升平[1] 

机构地区：[1]中国地质大学

出　　处：《新疆地质》1992年第2期155-166,共12页Xinjiang Geology

摘　　要：北山地区火山岩发育,以熔岩和凝灰岩为主。空间上呈线性分布,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、微量元素和稀土元素、同位素特征,均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。The volcanics in the Beishan area, consisting mainly of lava and tuff, are well developed and linearly distributed. The lithologic associations, being rich in Mg and poor in K, are basalt, andesite and rhyolite, The petrologic index, trace elements, rare earth elements and isotopic characteristics reveal the origin of magma from the partial melting of the upper mantle. The magma were partly disseminated during the rising stage. So the volcanics are believed to be the product of magmatism in the orogenic belt.

关 键 词：火山岩 岩石化学 微量元素 同位素 造山带 

分 类 号：P5[天文地球—地质学]