西准噶尔色尔登花岗岩地球化学特征及其构造意义  

GEOCHEMICAL CHARACTERISTICS AND TECTONIC SIGNIFICANCE OF SEERDENG GRANITE IN WEST JUNGGAR

作　　者：姚超[1] 第鹏飞[2] 王金荣[1] 何彦斌[1] 张伟 刘昆鑫[1] 魏东伟[1] 

机构地区：[1]兰州大学地质科学与矿产资源学院,甘肃兰州730000 [2]甘肃省国土资源厅,甘肃兰州730000

出　　处：《甘肃地质》2012年第2期14-20,共7页Gansu Geology

基　　金：新疆维吾尔自治区国土资源厅国土大调查项目资助(【2008】增01-01-01)

摘　　要：本文在野外实地调查的基础上,分析研究了新疆西准噶尔色尔登花岗岩岩体的岩石组合类型和岩石地球化学特征。研究结果表明,色尔登岩体为晚石炭世后I型花岗岩,形成于后碰撞伸展背景下,物源为下地壳中基性物质的部分熔融,但形成时的地壳厚度较薄,部分熔融的热力来源为软流圈玄武质岩浆底侵作用。本文通过探讨西准噶尔晚石炭世花岗岩类形成时的构造环境、成因机制及构造意义,为西准噶尔地区晚石炭世地壳内部物质重新分配的过程研究提供了新的依据。Based on the field study, this paper has carried out petrology and petro-geochemistry of Seerdeng granites in West Junggar, formed during the Late Paleozoic, formation mechanism and tectonic significance. The study results show that Seerdeng granite was I-type granites, which formed in a post-collisional extension setting, and resulted from the partial melting of basical substance of lower crust, with a circumstance of relativelt thin continental crust, and the the heat energy for partial melting was provided by the underplating of asthenosphere basaltic magmas. The study provides new evidence for Late Carboniferous crustal material and re-allocation process （crustal evolution） in the West Junggar.

关 键 词：后碰撞 花岗岩 地球化学 构造意义 晚古生代 西准噶尔 

分 类 号：P588.121[天文地球—岩石学]