2005•Dixue qianyuanRequires access
The main control factor for Jurassic distribution in Qaidam Basin
Zhiyong Chen, Xiao Ancheng, Zhou Su-ping, Guangyu He
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Abstract
We discuss in this paper controls on the current distribution of Jurassic strata in Qaidam Basin. Jurassic sedimentation was uninterrupted. The depocenter of the Lower Jurassic fault basin lies south of the Altun Fault and the Hongshan and Lenghu structural belts. A down-warped basin formed in the Middle Jurassic, and the area of sedimentation was larger than that of the Early Jurassic. A larger down-warped basin formed during the Late Jurassic and the Early Cretaceous. The basin was uplifted and denuded in the Late Cretaceous, and most of the denudation region was in the Lenghu area. The current distribution of Jurassic strata was influenced critically by strike-slip faulting and thrusting in the Late Cenozoic. Uplift of the Saishiteng and Southern Qilian Mountains divided the Jurassic sequences into southern and northern geographic remnants.