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藏东巴青县北部酉西岩组构造片理形成及构造意义
引用本文:王根厚,贾建称,万永平,张维杰,周志广,李秋实,杨国东.藏东巴青县北部酉西岩组构造片理形成及构造意义[J].地学前缘,2006,13(4):180-187.
作者姓名:王根厚  贾建称  万永平  张维杰  周志广  李秋实  杨国东
作者单位:中国地质大学(北京),地球科学与资源学院,北京,100083
基金项目:国家自然科学基金;地质调查局地质调查项目
摘    要:西藏巴青县以北酉西岩组主要由石英构造片岩、钠长石英构造片岩、白云母石英构造片岩组成,构造片理为近水平韧性剪切作用产物。宏观上构造片理构成了宽缓的背形、向形褶皱构造,构造片理上广布一期透入性拉伸线理,将构造片理展平,分布在透入性片理上的线理具明显优选方位,方向为280~100°。根据微观构造分析,韧性剪切指向为自西向东运动,构造片岩内发育多硅白云母。多硅白云母电子探针分析结果认为其形成环境为低温高压蓝片岩相,变质温度确定为320~500℃、压力0·6~1·1GPa。多硅白云母40Ar/39Ar测年结果为(230±1)Ma,为中三叠世末期。酉西岩组构造片理(韧性剪切作用)与查吾拉—吉塘印支期构造岩浆带形成密切相关。

关 键 词:藏东巴青县  酉西岩组  韧性剪切  构造片理  多硅白云母
文章编号:1005-2321(2006)04-0180-08
收稿时间:2006-04-31
修稿时间:2006-05-16

Forming and tectonic significance of the Youxi tectono-schistose formation, north Baqen county, eastern Tibet
WANG Gen-hou,JIA Jian-cheng,WAN Yong-ping,ZHANG Wei-jie,ZHOU Zhi-guang,LI Qiu-shi,YANG Guo-dong.Forming and tectonic significance of the Youxi tectono-schistose formation, north Baqen county, eastern Tibet[J].Earth Science Frontiers,2006,13(4):180-187.
Authors:WANG Gen-hou  JIA Jian-cheng  WAN Yong-ping  ZHANG Wei-jie  ZHOU Zhi-guang  LI Qiu-shi  YANG Guo-dong
Abstract:Youxi schistose formation outcrops north to the Baqen county, Tibet, is composed of quartz schist, albite-quartz schist, and muscovite-quartz schist with penetrative schistosity and mineral lineation. The schistosity in the formation exhibits structural styles of open antiform and synform, and the mineral lineation shows preferred orientation at 100-280°. Micro-fabric analysis for the ductile shear deformation indicates the eastward kinematics. Electron Microprobe analyses of the metamorphic mineral assemblage identified a composition of phengite, which was further determined to be formed at a temperature of 320-500 ℃ and a high-pressure of 0.6-1.1 GPa. The temperature-pressure condition represents a grade of blueschist metamorphism. The phengites was dated at (230±1) Ma by the ~ 40 Ar/~ 39 Ar method. We concluded that the forming of the Youxi schistose formation was closely affiliated with the Chawula-Jitang Indosinian tectono-magmatic event within eastern Tibet.
Keywords:Baqen county in eastern Tibet  Youxi formation  ductile shear deformation  schistose  phengite
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