藏北南羌塘盆地曲瑞恰乃地区中侏罗世色哇组、莎巧木组、布曲组的生物地层特征

Biostratigraphic of the Middle Jurassic Sêwa, Shaqiaomu and Bi Qu formations in the Quruiqianai area, south Qiangtang basin, northern Tibet, China

摘要: 对藏北南羌塘盆地曲瑞恰乃地区的晚三叠世—侏罗纪地层进行了研究，自下而上划分为晚三叠世日干配错群, 晚三叠世—早侏罗世索布查组,早侏罗世曲色组,中侏罗世色哇组、莎巧木组、布曲组、夏里组和晚侏罗世索瓦组。其中，对中侏罗世色哇组、莎巧木组、布曲组生物地层的研究为本文的主要内容,研究成果为该区中侏罗世地层层序的建立和详细对比提供了重要的依据。

Abstract: Late Triassic-Jurassic strata were studied in the Quruiqianai area, south Qiangtang basin, northern Tibet. The strata may be divided in ascending order into the Late Triassic Rigain Pünco Group, Late Triassic-Early Jurassic Suobucha Formation, Early Jurassic Qusi Formation, Middle Jurassic Sêwa, Shaqiaomu, Bi Qu and Xali formations and Late Jurassic Suowa Formation. In the paper the authors focus the discussion on the Middle Jurassic biostratigraphic of the Sêwa, Shaqiaomu and Bi Qu formations. The study provides an important basis for the establishment of the stratigraphic sequence and detailed correlation of the Middle Jurassic in the area.