西天山特克斯一带双变质带特征  

Characteristics of Paired Metamorphic Belt(Melange) along Tekes Area in Western Tianshan

作　　者：梁有为 郭洪方 于海峰 

机构地区：[1]辽宁省地质勘查院,辽宁大连116100 [2]辽宁地质矿产研究院,辽宁沈阳110032

出　　处：《西北地质》2016年第1期1-14,共14页Northwestern Geology

基　　金：新疆维吾尔自治区1:5万区域地质矿产调查项目(XJQDZ2006-06;XJQDZ2003-23)资助

摘　　要：特克斯一带双变质带是西天山双变质带重要组成部分。对特克斯一带双变质带特征的详细观察和讨论,可能对整个西天山双变质带深入研究起到解剖麻雀的作用。低压相系变质岩是以堇青石片岩类为代表;高压相系变质岩是以蓝闪石片岩类为代表。在后继的收缩体制下,由于陆-陆碰撞作用,使能干性不同的层状变质岩叠置到一起,经过强烈纵向构造置换作用,使能干性较强的蓝闪石片岩类(包括大理岩)变成透镜状、似层状岩石,嵌在数量较多、能干性较弱的堇青片岩类里,构成双变质带混杂体。变质作用的时间约为晚志留世末。堇青石片岩类为低压相系角闪岩相岛弧型变质作用;蓝闪石片岩类属于高压相系低绿片岩相俯冲带型变质作用。The Tekes paired metamorphic belt is an important part of the paired metamorphic belt in West Tianshan. Detailed observations and discussions on the characteristics of Tekes paired metamorphic belt are contribute to in-depth studying the paired metamorphic belt in entire west- ern Tianshan. The metamorphic rocks with low-pressure facies series are respected by the rock groups of cordierite schist, but the ones with high-pressure facies series are delegated by the rock groups of glaucophane schist. Under the subsequent compression system, the stratified metamor- phic rocks with different competent had been superimposed together by continent-continent colli- sion. After experiencing strong displacement of longitudinal structures, the rock groups of glau- cophane schist （including marble） with strong competent had been changed as lenticular, layered rock, which had been embedded in the rock groups of cordierite schist （with weak competent and large quantity）, constituting the melange of paired metamorphic belt. The time of metamorphism is about the end of Late Silurian Epoch. The rock groups of cordierite schist were formed by is- land arc type metamorphism with amphibolite facies in low-pressure facies series, but the ones of glaucophane schist were developed by subduction zone type metamorphism with low greenschistfacies in high-pressure facies series.

关 键 词：蓝闪石片岩 堇青石片岩 高压相系:低压相系 双变质带混杂体 

分 类 号：P541[天文地球—构造地质学]