新疆东天山柳树沟两类侵入岩地球化学特征  

Geochemistry of the two kinds of intermediate-acid rocks from the Eastern Tianshan

作　　者：刘军锋[1] 李勇[1] 陈丹丹[1] 董小涛[1] 

机构地区：[1]长安大学西部地质资源与地质工程教育部重点实验室/地球科学与国土资源学院,陕西西安710054

出　　处：《西北大学学报（自然科学版）》2012年第4期629-636,共8页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(40773044);中国地质调查局基金资助项目(K46C001002);长安大学中央高校基金资助项目(CHD2010JC042)

摘　　要：目的探讨东天山柳树沟地区两类中酸性岩体的岩石成因及其构造环境。方法对两类中酸性岩体进行详细的野外地质、岩相学及地球化学分析。结果两岩体均富集LREE,花岗岩具有Ba,Nb,Sr,Eu的亏损以及Rb,Th,U,Pb 4种元素的富集,闪长岩具有Th负异常以及Sr,Pb的正异常。结论东天山在晚石炭世为火山弧环境。Aim To explore the two kinds of intermediate-acid intrusions petrogenesis and structural setting, in the Liushugou Area of the Eastern Tianshan. Methods Field observation and geochemical analysis on the whole rocks were used. Results These two kinds of intrusions are featwed with high LREE concentrations, with Ba, Nb, Sr, Eu depletions and Rb, Th, U, Pb enrichments in granite, while with Th depletions and Sr, Pb enrichments in diorite. Conclusion It was a volcanic arc setting in the eastern Tianshan in the late Carboniferous.

关 键 词：东天山 中酸性岩体 地球化学 火山弧 

分 类 号：P597.3[天文地球—地球化学]