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Cenozoic tectonic and sedimentary evolution of southern Qaidam Basin,NE Tibetan Plateau and its implication for the rejuvenation of Eastern Kunlun Mountains |
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| Authors: | LiGuang Mao AnCheng Xiao Lei Wu BenLiang Li LiQun Wang QianQian Lou YouPu Dong SuHua Qin |
| Institution: | 1. Department of Earth Sciences, Zhejiang University, Hangzhou, 310027, China 2. Research Center for Structures in Oil & Gas Bearing Basins, Ministry of Education, Hangzhou, 310027, China 3. PetroChina Research Institute of Petroleum Exploration & Development, Beijing, 100083, China 4. Qinghai Oilfield Company, PetroChina, Dunhuang, 736200, China 5. Zhejiang No.3 Geology Group, Jinhua, 322100, China 6. Research Institute of BGP inc., China National Petroleum Corporation, Zhuozhou, 072751, China |
| Abstract: | The Eastern Kunlun Mountains play an important role in the growth and eastward extrusion of the Tibetan Plateau. Tectonic and sedimentary study of the Cenozoic Qaidam Basin, especially the southern part, provides key evidence for understanding their evolution. Here we present evidence including isopach maps, seismic sections and sedimentary analysis of single well to illustrate the sedimentary development of the basin and the structural features of its southern margin. The Qaidam Basin extended across Qiman Tagh-Eastern Kunlun Mountains in the early Cenozoic and withdrew northward at ca. 35.5 Ma, and then buckled as an EW striking elliptical depression since ca. 14.9 Ma, with the main depocenter migrating eastward. Our results support the view that the Kumukol and Hoh Xil basins joined the Qaidam Basin in the early Cenozoic time and we propose the Eastern Kunlun Mountains uplifted in the mid-Miocene. |
| Keywords: | NE Tibetan Plateau Qaidam Basin Eastern Kunlun Cenozoic mid-Miocene |
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