New Advances in the Study of Jurassic-Cretaceous Biostratigraphy and Isotopic Ages of the Junggar Basin in Xinjiang and Their Significance

详细信息   

• 责任者：Wang Si’en (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Pang Qiqing
• 刊名：Geological Bulletin of China
• 出版年：2012
• 卷期：31(4)
• 关键词：侏罗纪 ; Jurassic ; 白垩纪 ; Cretaceous ; 准噶尔盆地 ; Junggar Basin
• 页码：p.493-502
• 图表：5 illus., 1 table, 3 plates, 9 refs.
• 分类号：1200
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

摘要

In this paper, the strata studied include the Jurassic Toudunhe Formation, Qigu Formation, Kalazha Formation and the Cretaceous Qingshuihe Formation. Studies of conchostracans, ostracods and spore-pollen assemblages from the Qingshuihe Formation in dicate that the Qingshuihe Formation is early Early Cretaceous (Berriasian) in age. The isotopic age of the tuff from the lower part of the Qigu Formation is (164.6±1.4) Ma, almost corresponding to (164.7±4.0) Ma of the Bathonian/Callovian boundary age. The facts show that the Late Jurassic strata were almost wholly absent, suggesting that during the Late Jurassic period there existed a relatively strong tectonic movement in this area.