西藏当雄错—姆错丙尼地区早二叠世拉嘎组及杂砾岩成因探讨  

A DISCUSSION ON THE ORIGIN OF THE HETEROGENEOUS CONGLOMERATE OF THE EARLY PERMIAN LAGA FROMATION IN THE DANGXIONGCUO-MUCUOBINGNI AREA,TIBET

作　　者：李晓勇 肖业斌 袁建芽 黄传冠 谢国刚 欧阳克贵 

机构地区：[1]江西省地质调查院,江西南昌330201

出　　处：《江西地质》2001年第4期247-252,共6页Jiangxi Geology

基　　金：国家地质调查项目:1:20万西藏邦多区幅;措麦区幅区域地质调查(项目编号20001300009161).

摘　　要：本文通过1∶25万《邦多区幅》和《措麦区幅》区域地质调查,对西藏当雄错—姆错丙尼地区的早二叠世拉嘎组进行了地层古生物及杂砾岩特征的研究,认为:所采生物化石均赋存于滑塌块体中,反映的地质时期为早二叠世Sakmarian-Artinskian期,而赋含滑塌块体的“基质”地层时代应稍晚于早二叠世Sakmarian-Artinskian期;沉积特征表明杂砾岩成因具冰海相和水下块体重力流的双重(复合)性质。In carrying out 1:250000regional geological survey in the Bangduo map-sheet area and the Cuo-mai map-sheet area,the authors have studied the Stratigraphic paleontology and the heterogeneous conglomerate features of the Early Permian Laga Formation in Dangxiongcuo-Mucuobingni area of Tibet,suggesting that all the fossils collected occurred in slip blocks which is Early Permian Sakmarian-Artinskian in age,while the age of the ground mass containing these slip blocks should be slightly younger.Based on depositional characteristics,the heterogeneous conglomerate has a dual character combining glaciomarine facies and subaqueous block flow by gravity in origin.

关 键 词：早二叠世 地层时代 杂砾岩 当雄错-姆错丙尼地区 西藏 拉嗄组 

分 类 号：P534.46[天文地球—古生物学与地层学]