雅鲁藏布江结合带东段仁布-曲松地层分区上三叠统朗杰学（岩）群层序及构造样式再认识

摘要

Plentiful studies have been conducted in the last decades on the stratigraphic sequences,sedimentary characteristics,deformation and metamorphism,provenance and tectonic settings of the Upper Triassic Langjiexue Group(Complex)in the Renbu-Qusong stratigraphic subprovince in the eastern part of the Yarlung Zangbo suture zone,Xizang. The authors in this study present the redivision of the Langjiexue Group(Complex)on the basis of the existing data on the tectono-lithostratigraphy,palaeontology,deformation and tectonic settings,and contend that the Langjiexue Group( Complex)should be composed,from the base upwards,of the Songre,Jiangxiong and Jiedexiu(Zhangcun)Formations( Complex),and display the structural patterns of a " Ω"-type asymmetrical anticlinorium.%雅鲁藏布江结合带东段夹在南、北两条蛇绿混杂岩带之间的一套活动类型的上三叠统朗杰学（岩）群，许多地质工作者对其地层层序、沉积特征、变形变质、物质来源以及形成的构造环境进行过研究。作者在前人工作成果的基础上，综合对比了已往区调工作获得的实际资料，以（构造）岩石地层为基础，结合沉积古生物特征、变形特征以及区域大地构造背景，对该岩（群）作了进一步的研究。初步认为：朗杰学（岩）群地层层序自老至新为宋热（岩）组、江雄（岩）组和姐德秀（岩）组（章村岩组）；郎杰学（岩）群的构造样式为一“Ω”型两翼不对称的复式背斜构造。