CAJ | 학술논문

根据1∶5万西藏仲巴地区区域地质调查工作，结合1∶25万区域地质资料和前人研究成果，对被认为属于雅鲁藏布江缝合带西段夹持于两套混杂岩之间呈狭长分布的海相古生界为主地质体进行了研究。建议统一使用“仲巴微地体”术语以体现其构造属性，并初步定义为：仲巴微地体是指南东起于萨嘎县北查藏一带向北西到中印边界附近、被札达-仲巴-查藏和穷果-门士两条主断裂限制、一套以海相地层为主的地质体，它是由海相（震旦系/）奥陶系-三叠系组成的地层地体。进一步对比研究提出，仲巴微地体大致以巴噶-马攸木为界可分为幕霞和霍尔巴-仲巴两个地层分区，前者岩性未变质-弱变质，地层单斜、褶皱开缓；后者前石炭系以中低级绿岩相-片岩相为主，发育紧闭和同斜倒转褶皱；该地体可以划分为震旦系-寒武系、奥陶系-泥盆系、石炭系-二叠系、三叠系四个构造层，大致反映了其构造和沉积演化。
근거1∶5만서장중파지구구역지질조사공작，결합1∶25만구역지질자료화전인연구성과，대피인위속우아로장포강봉합대서단협지우량투혼잡암지간정협장분포적해상고생계위주지질체진행료연구。건의통일사용“중파미지체”술어이체현기구조속성，병초보정의위：중파미지체시지남동기우살알현북사장일대향북서도중인변계부근、피찰체-중파-사장화궁과-문사량조주단렬한제、일투이해상지층위주적지질체，타시유해상（진단계/）오도계-삼첩계조성적지층지체。진일보대비연구제출，중파미지체대치이파갈-마유목위계가분위막하화곽이파-중파량개지층분구，전자암성미변질-약변질，지층단사、습추개완；후자전석탄계이중저급록암상-편암상위주，발육긴폐화동사도전습추；해지체가이화분위진단계-한무계、오도계-니분계、석탄계-이첩계、삼첩계사개구조층，대치반영료기구조화침적연화。
On the bases of newly 1∶50,000 regional geological investigation and achievements of 1∶250,000 regional geological reports as well as former studies in Zhongba area,a terrane with strata dominated by the marine Paleozoic-Triassic was nominated and classified in this paper,which are narrowly pinched out between the so-called two series of mé langes within the western Yarlung Zangbo suture.The Zhongba microterrane,as suggested herein, is defined as a stratigraphical terrane composed of the marine (Sinian-/)Ordovician through the Triassic and confined between two faults:Zanda-Zhongba-Chacang fault in NE,Qonggo-Munse fault in SW.Two stratigraphical subzonations of the Muxia and Horba-Zhongba can be distinguished by a rough Barga-Mayom boundary.In the Muxia subzonation,the Ordovician-Triassic is sedimentary and/or slightly metamorphosed with single dip and/or open fold,but in the Horba-Zhongba subzonation the pre-Carboniferous is mainly medium-lowly grade metamorphosed with tight and congruous fold. Four tectonic layers are classified as the Sinian-Cambrian, Ordovician-Devonian, Carboniferous-Permian,and Triassic by nonconformity respectively, approximately representing four periods of sedimentary and tectonic evolution for the microterrane.