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一、前言 1978年西藏地质局综合研究队在申扎地区首次发现了一套古生代浅海沉积,并相应的建立了比较完整的古生代地层系统,其中包括二叠纪地层。申扎地区二叠系分布广泛,发育良好,但缺乏上二叠统。下二叠统出露于申扎永珠、他尔马、格仁错、文部一带,为陆表滨浅海碳酸盐岩沉积,富含腕足、珊瑚、(?)类等化石。下二叠统以永珠下拉一带出露最佳,1980年,西藏综合研究队将其命名为下拉组,时代归属于栖霞一茅口期,代表早二叠
I. Introduction In 1978, the comprehensive geological research team of the Tibet Bureau of Geology discovered a set of Paleozoic shallow sea sediments for the first time in the Xainza area and established relatively complete Paleozoic stratigraphic systems, including Permian strata. The Permian in the Xainza area is widely distributed and well developed, but lacks the Upper Permian. The Lower Permian is exposed in the areas of Shenzhan Yongzhu, Talma, Gerren and Wenbu, and is characterized by shallow marine carbonate deposits on land surface and rich fossils such as brachiopods, corals and (?). The Lower Permian was best exposed by the pull-down of the Yongzhu. In 1980, the Tibet Integrated Research Team named it the pull-down group. The era belonged to the Qiaoxia Maotou period, representing the Early Permian