论文部分内容阅读
西藏尼玛县荣玛乡依布茶卡东、南及牛山剖面的龙格组沉积了厚度较大的碳酸盐岩地层。在龙格组碳酸盐岩内发育丰富多样的小有孔虫化石计有16属45种,据其纵向分布特征,自下而上划分为两个小有孔虫组合:Pachyphloia-Nodosaria-Geinitzina组合和Hemigordiopsis组合。小有孔虫化石的发现,解决了长期以来对牛山剖面龙格组的归属争议,通过与其他地区同期层位的小有孔虫对比,将龙格组的时代重新修订为中二叠世栖霞晚期—茅口期,并且进一步丰富完善了南羌塘盆地中二叠世生物地层序列。
The carbonate rock formations with thicker thickness have been deposited in the Longge Formation in the Emacajaya, Nandu and Niushan sections of Rongma Township, Nima County, Tibet. There are 16 genera and 45 species of small foraminiferal fossils in the Longge Formation carbonate rocks. According to their longitudinal distribution, they are divided into two small foraminifera groups from the bottom up: Pachyphloia-Nodosaria-Geinitzina assemblage And Hemigordiopsis combination. The discovery of a small foraminiferal fossil solves the longstanding controversy over the Longge Formation in the Niushan section. Compared with the small foraminifera of the same period in other areas, the age of the Longge Formation was revised as the Middle Permian Qixia Late Pleistocene - Maokou period, and further enrich the Permian Biostratigraphic sequence of the Southern Qiangtang Basin.