内蒙古中部太古界乌拉山岩群变质作用特征  

Metamorphic characteristics of Archean Wulashan rock suite in middle region of Inner Mongolia, China

作　　者：贾和义[1] 刘颖璠[1] 张志祥[1] 高宝明[1] 

机构地区：[1]内蒙古自治区地质调查院,呼和浩特010020

出　　处：《成都理工大学学报（自然科学版）》2004年第5期467-472,共6页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：中国地质调查局资助项目(20001300008051)

摘　　要：内蒙古中部太古界乌拉山岩群变质作用PTt轨迹表现为顺时针形式,峰期变质的温度为830～948℃,压力为0.942GPa。是麻粒岩相变质作用发生于地壳大幅度增厚的环境,强烈的构造变动和区域性高热流共同作用的结果。从第二阶段峰期变质到第三阶段近等温减压过程为区域性地壳减薄的开始,直至第四期角闪岩相的退变质阶段显示出地壳大幅度减薄和抬升剥蚀的特点。The metamorphic PTt path of the Archean Wulashan rock suite is in the form of clockwise in the middle region of Inner Mongolia, and the metamorphic temperature ranges from 830℃ to 948℃, and pressure is 0.942 GPa. The above shows that granulite facies metamorphism occurred in the crust of (increasing) thickness and caused by strong tectonic disturbance and regional high heat flow. The a(pproximate) isothermal and reduced pressure from second to third stage is the beginning of regional thinning crust. The fourth degrading metamorphic stage of amphibolite facies shows the characteristics of thinning crust, uplift and denudation.

关 键 词：麻粒岩 变质作用 乌拉山岩群 内蒙古中部 

分 类 号：P588.34[天文地球—岩石学]