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Late Jurassic-Early Cretaceous Northern Qaidam Basin, NW China: Implications for the earliest Cretaceous intracontinental tectonism |
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| Authors: | Lei Wu Ancheng Xiao Liqun WangZhongyan Shen Suping ZhouYuanzhong Chen Liang Wang Dong LiuJunya Guan |
| Institution: | a Department of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang 310027, China b Research Center for Structures in Oil & Gas Bearing Basins, Ministry of Education, Hangzhou, Zhejiang 310027, China c Qinghai Oilfield Company, PetroChina, Dunhuang 736200, China d Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China e Dunhuang Branch of Eastern Geophysics Company, PetroChina, Dunhuang 736200, China |
| Abstract: | Formation of Mesozoic western China, which was dominated by tectonic amalgamation along its southern margin and associated intracontinental tectonisms, holds a key for interpreting the succedent Cenozoic evolution. This paper presents new data including lithology, sedimentary facies, stratigraphic contact, seismic interpretation and paleo-structures within the Upper Jurassic-Lower Cretaceous strata in the northern Qaidam Basin, NW China. These data all account for a contractional tectonic deformation in the earliest Cretaceous. The South Qilian Shan, according to the sedimentary features and provenance analysis, reactivated and exhumated during the deformation, controlling the deposition of the Lower Cretaceous sequences. A simplified model for the Late Jurassic-Early Cretaceous paleogeography and tectonics of the northern Qaidam Basin is accordingly proposed. The results also support a ∼25° clockwise rotation of the Qaidam Basin since the Early Cretaceous and a more accurate Mesozoic evolution process for the basin. This earliest Cretaceous deformation, associated with the reactivation of the South Qilian Shan at the time, are part of the intracontinental tectonisms in central Asia during the Mesozoic, and probably driven by both the closure of the Mongol-Okhostk Ocean to the north and the collision of the Lhasa and the Qiangtang blocks to the south. |
| Keywords: | Northern Qaidam Basin South Qilian Shan The earliest Cretaceous Orogen reactivation Intracontinental tectonism |
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