藏北羌塘地块的构造性质和构造格局是中国地学界长期争论的重要问题。这里人迹罕至 ,研究程度很低 ,基础地质资料缺乏。这是有关地质问题得不到解决的根本原因之一。本项研究的首要目的也就是为该地区的地质研究提供一份基础资料。羌塘地块腹地查桑地区的上三叠统肖茶卡组 ,下部为细碧岩、中基性火山岩、玄武质角砾岩夹灰岩和大理岩 ,上部主要为碎屑岩 (复理石 )和灰岩。我们在肖茶卡组上部的复理石中采集砂岩、粉砂岩样品 ,进行主量元素地球化学分析 ,并利用分析结果对其沉积大地构造背景物源区性质进行判别。研究结果表明 ,当时本区属于活动大陆边缘大洋岛弧环境 ,物源主要来自中性火山岩物源区 The tectonic and tectonic setting of the Qiangtang block in northern Tibet is an important issue that Chinese geosciences have long debated. Inaccessible here, the study is very low, the lack of basic geological information. This is one of the fundamental reasons why geological problems can not be solved. The primary purpose of this study is to provide a basic source for geological research in the area. The Upper Triassic Xiaochaka Formation in the Chasang area in the hinterland of the Qiangtang block, where the lower part is small bikarites, medium-basic volcanic rocks, basaltic breccia-lacustrine limestone and marble, and the upper part is mainly clastic rocks Stone) and limestone. We collected samples of sandstone and siltstone in the flysch from the upper part of the Xiaochaka Formation to conduct the major element geochemical analysis and used the results to distinguish the nature of the provenance area of ​​the sedimentary tectonic setting. The results show that at this time the area belongs to the active continental margin oceanic island arc environment, the source of the material comes mainly from the neutral volcanic source areas