阿尔泰阿祖拜地区递增变质带特征及演化  

Characteristics and Evolution of the Progressive Metamorphic Belt in Azubai Area of Altay

作　　者：张宏宝[1] 张洋[1] 王书芬[2] 李金和[1] 

机构地区：[1]河北省区域地质矿产调查研究所,河北廊坊065000 [2]河北省保定地质工程勘查院,河北保定071051

出　　处：《新疆地质》2012年第3期264-267,共4页Xinjiang Geology

基　　金：新疆1:5万区域地质矿产调查项目办公室(XJQDZ2004-03)项目资助

摘　　要：新疆阿尔泰阿祖拜地区发育两种类型区域变质作用,第一种为区域低温动力变质作用,第二种为区域动力热流变质作用。阿祖拜地区递增变质带是后者的典型代表之一,从花岗岩体外接触带依次发育矽线石-堇青石带、红柱石-十字石带、黑云母-石榴石带,递增变质作用强度呈逐渐减弱趋势。结合变形变质作用特征和同位素年龄,可识别出3个变形变质阶段。早期阶段以区域低温动力变质作用为主,形成绿片岩相变质岩石组合;峰期阶段为区域动力热流变质作用,形成典型的递增变质带;晚期阶段则属退化变质作用。不同变质作用类型代表了不同大地构造环境,记录了造山带演化历史和动力学过程。The Azubai area of Altay, has experienced two types regional metamorphism,the first type is regional low-temperature dynamic metamorphism and the second one belongs to regional dynamic heat flow metamorphic type.The progressive metamorphic belt to Azubai is just one of the typical representation of the latter type,in peripheral contact metamorphic belt of the granitic mass,has developed sillimanite-cordierite belt,andalusite-staurolite belt and biotite-garnet belt in turn and the intension of progressive metamorphism tend to weakened. Combines the characteristics of deformationc and metamorphism and isotope ages,we could identify three stages of deformationc and metamorphism.In the early stage, the metamorphism is characterized by typical metamorphic mineral assemblage of greenschist facies with low metamorphic temperature;The intermediate stage,mainly with regional dynamic heat flow metamorphism,the typical progressive metamorphic belt was formed; Retrogressive metamorphism occurred in the late stage.Different metamorphic types reveal different tectonic conditions and record the evolutionary history and geodynamic process in Azubai area of Altay, Xinjiang.

关 键 词：阿尔泰 阿祖拜 变质作用类型 递增变质带 构造演化 

分 类 号：P542.2[天文地球—构造地质学]