Intra-platform tectono-sedimentary response to geodynamic transition along the margin of the Tarim Basin,NW China |
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| Institution: | 1. Seismology Division, Ministry of Earth Sciences, Lodhi Road, New Delhi, India;2. Institute of Seismological Research, Raisan, Gandhinagar, Gujarat, India;3. National Centre for Research on Earthquake Engineering, Taipei, Taiwan;4. Department of Geophysics, Kurukshetra University, Kurukshetra, Haryana, India;1. School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China;2. China Earthquake Networks Center, No. 5, Nanheng Street, Sanlihe, Xicheng District, Beijing 100045, China;3. International Institute of Seismology and Earthquake Engineering, Building Research Institute, Tsukuba, Japan;1. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;2. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China;3. Chengdu Institute of Geology and Mineral Resources, China Geological Survey, Chengdu 610081, China;4. Department of Land and Resources of Hubei Province, Wuhan 430074, China;1. Geology and Geophysics Department, College of Science, King Saud University, Saudi Arabia;2. Geology Department, Faculty of Science, Zagazig University, Zagazig, Egypt;1. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China;2. School of Earth Science, China University of Petroleum, Beijing 102249, China;3. Key Laboratory for Hydrocarbon Accumulation of Ministry of Education, China University of Petroleum, Beijing 102249, China;4. School of Resource and Earth Science, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China;5. Tarim Oilfields Company, PetroChina, Korla 841000, Xinjiang, China |
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| Abstract: | The Tarim Basin has experienced three tectonic evolutionary phases from the Cambrian to Ordovician: (1) Regional extension from the late Neoproterozoic to Mid-Early Cambrian, (2) Relatively weak regional compression from the Late Cambrian to Mid-Early Ordovician, and (3) Regional compression during the Late Ordovician. Intra-platform tectonic and sedimentary characteristics indicate a clear linkage to the tectonic evolution of the basin margin during early Paleozoic time. During the Cambrian, small intra-platform rift-related depressions formed during an extensional setting. During the Mid-Early Ordovician, a transition from extension to compression caused formation of the Tazhong and Tabei paleo-uplifts and major unconformities T74 (base of the Late Ordovician). The evolving paleo-geomorphology led to differentiation of sedimentary facies, and numerous intra-platform shoals formed during deposition of the Early Ordovician Yingshan Formation. During the Late Ordovician, regional compression began, which changed the platform margin slopes into four slopes that surrounded the three isolated island uplifts of Tabei, Tazhong, and Tangnan in the Late Ordovician. Simultaneously, the basin margin dynamic conditions also changed the relative sea level and filling pattern of the basin. In the Early and Middle Cambrian, the Tarim Basin mainly developed a progradational ramp-type platform due to relative sea level fall. From the Late Cambrian to Early Ordovician the relative sea level began to rise, resulting in an aggradational—retrograding rimmed margins-type platform. In the Late Ordovician, along with a further rise in relative sea level, the basin mainly developed isolated platform. |
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| Keywords: | Intra-platform rift-related depression Intra-platform shoal Paleo-uplift marginal slope Tarim Basin Northwest China |
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