Intracontinental orogenic transition: Insights from structures of the eastern Junggar Basin between the Altay and Tianshan orogens |
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| Institution: | 1. College of Marine Geosciences, Ocean University of China, Qingdao 266100, PR China;2. The Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, PR China;3. Dagang Oil-Gas Company, CNPC, Tianjin 300280, PR China;1. Chinese Academy of Geological Sciences, Beijing 100037, China;2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;3. Laboratory of Geological Formations, K. Satpaev Institute of Geological Sciences, Almaty 050010, Kazakhstan;4. China University of Geosciences, Beijing 100083, China;1. College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;2. Key Lab of Submarine Geosciences and Exploration Techniques, Ministry of Education, Qingdao 266100, China;3. UCD School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland;1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;2. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210023, China;3. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing, China;1. Key Lab of Submarine Geosciences and Prospecting Technique, Ministry of Education, Qingdao 266100, China;2. College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;3. UCD School of Geological Sciences, University College Dublin, Belfield 4, Dublin, Ireland;1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China;2. Research Institute of Petroleum Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;2. Key Laboratory of Reservoir Characterization, China National Petroleum Corporation, Lanzhou 730020, China;3. Research Institute of Petroleum Exploration & Development-Northwest, PetroChina, Lanzhou 730020, China;4. Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, Urumqi, Xinjiang 830000, China;5. BGP Inc., China National Petroleum Corporation, Dunhuang 736203, China;6. School of Geography and Ocean Science, MOE Key Laboratory of Coast and Island Development, Nanjing University, Nanjing 210023, China |
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| Abstract: | Detailed subsurface structure of the eastern Junggar Basin is investigated using a large number of high-resolution two-dimensional reflection seismic profiles and well data. Our results reveal thrust faults, some of which are with strike-slip component, and fault-related folds dominating the subsurface structure of the study area. The thrust faults mainly show a divergent pattern towards the west and convergence towards the east. We divide these thrust faults and folds into three structural systems. The north thrust system, located in the north of the study area, is characterized by top-to-the southwest imbricate thrusts initiated from late Paleozoic. The central transpression system, dominating the central study area, mainly consists of thrust faults with visible strike-slip component, active from early Mesozoic until Cretaceous. The South thrust system includes top-to-the southeast thrusts in the southern part of the study area. The existence of these structural systems indicates that the eastern Junggar Basin underwent obvious intracontinental deformation in Mesozoic, probably due to the continuous convergence between the Altay and the Tianshan orogens after the main collision-accretion processes of the Central Asian Orogenic Belt. |
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| Keywords: | Thrusts Intracontinental deformation Junggar Basin Altay Orogen Tianshan Orogen The Central Asian Orogenic Belt Mesozoic |
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