内蒙古武川西乌兰不浪高级区岩石及其形成环境  

Metamorphic Petrology and Tectonic Setting of the Xi-Ulanbulang High-Grade Terrain, Wuchuan County, Inner Mongolia

作　　者：张玉清[1] 许立权[1] 贾和义[1] 刘颖璠[1] 王弢[1] 

机构地区：[1]内蒙古自治区地质调查院,呼和浩特010020

出　　处：《地质调查与研究》2005年第2期71-78,共8页Geological Survey and Research

基　　金：中国地质调查局区域地质调查项目(20001300008051)

摘　　要：西乌兰不浪高级变质的兴和岩群是1∶5万、1∶25万区域地质调查时从海西期岩体和五台群中重新厘定出来的地质体。通过野外宏观地质特征、岩石化学、地球化学等综合分析,认为西乌兰不浪地区高级区岩石不只是由表壳岩组成,还有大量的TTG岩系、紫苏花岗岩、脉岩和岩墙,它们是不同构造环境、不同时代的构造拼合体。其中表壳岩称为兴和岩群,为一套火山—沉积岩系,形成于活动大陆边缘。The Xi-Ulanbulang high-grade terrain is located in the northwest of Wuchuan County, Inner Mongolia, in which the Xinghe Rock-group is distinguished out from the original Variscian magmatic rocks and the Archean Wutai Group. Through the integration of field investigation, petrochemical and geochemical analysis,it is thought that the Xi-Ulanbulang high-grade terrain consists of not only supracrustal rocks, but also lots of TTG, charnockite and dyke rocks, which implicates to be a tectonic assemblage of various rocks with different setting and time. Among the assemblage, the supracrustal rocks named the Xinghe Rock-group is composed of volcano-sedimentary rocks that formed in mobile continental margin. These rocks underwent intensive thermal-tectonic event, metamorphosed into high-amphibolite to granulite facies.

关 键 词：表壳岩 TTG 紫苏花岗岩 高角闪岩-麻粒岩相 内蒙古西乌兰不浪 

分 类 号：P534.1[天文地球—古生物学与地层学]