江西田里片岩构造解析及其对华南元古代构造演化的指示意义  

STRUCTURAL ANALYSIS OF THE SCHIST IN TIANLI,JIANGXI AND ITS IMPLICATIONS FOR THE PROTEROZOIC TECTONIC EVOLUTION IN SOUTH CHINA

作　　者：周宇章[1] ZHOU Yu-zhang(Public Geological Survey Management Center of Anhui Province,Hefei,Anhui 310091,China)

机构地区：[1]安徽省公益性地质调查管理中心,安徽合肥230091

出　　处：《安徽地质》2018年第4期241-246,253,共7页Geology of Anhui

基　　金：中国地质调查局综合研究项目"华东地区基础地质综合研究"(编码:200313000038)资助

摘　　要：田里位于华夏、扬子板块拼合处,主体岩性为中元古代高绿片岩相副变质岩,其蕴含丰富构造信息,反映了两大板块的构造运动过程。本文通过详细的野外工作,对片岩内褶皱、面理、线理等构造进行了解析,区分出其中主要发育四期构造:(1)紧闭线形褶皱;(2)"Z"型柔流褶皱;(3)"S"型剪切褶皱;(4)宽缓褶皱。结合前人资料,综合分析认为:片岩中主期构造发生于四堡造山期,与全球Rodinia超大陆汇聚有关,而中生代构造事件对本区影响不大。Tianli is located at the juncture of the Cathaysia plate and Yangtze plate,where the main lithology is para-metamorphic rock of Mesoproterozoic high green schist facies,which contains rich tectonic information and reflects the tectonic movement process of the two plates.Through detailed field work,this paper analyzes the fold,foliation,lineation and other structures in the schist,and identifies four stages of structures that are developed in it:(1)tight linear fold;(2)"Z"type gentle flow fold;(3)"S"type shear fold;(4)broad and gentle fold.Combined with previous data,the comprehensive analysis shows that the main schist structures formed during the Sibao orogeny and was related to the convergence of the global supercontinent Rodinia,while the Mesozoic tectonic events had little impact on this area.

关 键 词：构造解析 片岩 元古代 田里 华南 

分 类 号：P588.344[天文地球—岩石学]