Early Mesozoic basin development in North China: Indications of cratonic deformation |
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| Institution: | 1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. College of Geosciences and Resources, China University of Geosciences, Beijing 100083, China;3. ChevronTexaco China Energy Company, Shangri-La Office Tower, Chengdu, Sichuan 610021, China;4. State Key Laboratory of Continental Dynamics, Northwest University, Xi’an, Shanxi 710069, China;1. Institute of the Earth’s Crust,Siberian Branch of the Russian Academy of Sciences,Irkutsk, Russia;2. Université de Brest (UBO),CNRS UMR 6538 Domaines Océaniques,Institut Universitaire Européen de la Mer (OSU-IUEM), Brest, France;3. Ernst Geosciences, Canada; Department of Earth Sciences, Carleton University, Canada;4. Institute of the Earth’s Crust,Siberian Branch of the Russian Academy of Sciences,Irkutsk, Russia;1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;2. Key Laboratory of Paleomagnetism, Chinese Academy of Geological Sciences, Beijing 100081, China;1. Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454003, China;2. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China;1. China University of Geosciences, Wuhan 430074, China;2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 10081, China;3. Three Gorges Geotechnical Consultants Co., Ltd., Wuhan 430074, China |
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| Abstract: | We integrated a systematic sedimentary data into a regional Early Mesozoic stratigraphic framework which demonstrated a detailed picture of spatiotemporal variations in basin deposition and formation in the North China Craton. The Early Mesozoic basin sedimentary evolution is utilized to interpret polyphase tectonism and to unravel the craton deformation. The Late Triassic, nearly WNW-trending, giant intracratonic Ordos basin was widely distributed across most of North China Craton, with a southern wedge-top depozone along the northern East Qilian–Qinling orogenic belt and a northwestern rift depozone along the Helanshan. The continuous subsidence and deposition within the basin were dominantly related to the thrust load of the East Qilian–Qinling belt and inferred mantle flow effects associated with paleotethys plate subduction, and the rift in the northwestern Ordos was driven by nearly north-vergent compression of the eastern North Qilian–North Qinling active margins with the stable North China Craton. This intracratonic Ordos basin formation initiated the deformation of the North China Craton. Formation of the Jurassic NNE-trending walled intracratonic Ordos basin and the broken flexural basins indicates the North China Craton underwent the second, even more abroad nearly NNE trending crustal deformation, with lithosphere thickening in the eastern part of the North China Craton, and dynamic subsidence in the west, which may have been driven by nearly northwestward subduction of the Izanagi plate and the eastward extrusion and underthrusting of the western North China Craton crustal basement. |
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