甘肃北山南带峡东地区位于塔里木板块东段敦煌地块与北山古生代褶皱带的衔接部位,该地区的敦煌岩群由于构造变形及变质作用强烈,岩石组合及地质时代一直处于争论之中,本文依据1︰5万幅区域地质调查中发现的新资料、新成果,对该地区的敦煌岩群的组成重新进行了片麻岩与表壳岩划分,并着重对其中填绘出的以古老侵入岩体出现的正片麻岩体进行了分析说明。 The Gap East area in the south part of Beishan, Gansu is located at the junction of the Dunhuang block in the eastern segment of the Tarim plate and the Paleozoic fold belt in the Beishan. Due to tectonic deformation and metamorphism, the rock assemblage and geologic age of Dunhuang rock mass in this area have been under debate. Based on the new data and new achievements discovered in 1: 50000 regional geological surveys, the division of the gneiss and crustal rocks in the Dunhuang rock mass in this area is re-classified. The ancient intrusions The orthogneal gneiss appearing in the rock mass are analyzed and explained.