Episodicity of stress state in an overriding plate: Evidence from the Yalu River Fault Zone,East China |
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| Institution: | 1. Geology Department, Faculty of Science, Beni-Suef University, Beni-Suef 62521, Egypt;2. Geology Department, Faculty of Science, Helwan University, 11790 Cairo, Egypt;3. Geology Department, Faculty of Science, Cairo University, Giza 12613, Egypt;4. Economic Geology Research Unit (EGRU), Department of Earth and Oceans, James Cook University, Townsville, 4011, QLD, Australia;5. Department of Economic Geology and Petrology, Institute of Mineralogy, Technische University Bergakademie, Freiberg, Brennhausgasse 14, 09596 Freiberg/Sachsen, Germany;1. Chengdu Centre, China Geological Survey, Chengdu, Sichuan 610081, China;2. Key Laboratory of Tectonic Controls on Mineralisation and Hydrocarbon Accumulation of Ministry of Land and Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China;3. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;4. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;5. Centre of Exploration Targeting, The University of Western Australia, 35 Stirling Highway, CRAWLEY, WA 6009, Australia;1. Urweltmuseum GEOSKOP/Burg Lichtenberg (Pfalz), Burgstrasse 19, 66871 Thallichtenberg, Germany;2. Saurierwelt Paläontologisches Museum, Alte Richt 7, D-92318 Neumarkt, Germany;3. Museum für Naturkunde Magdeburg, Otto-von-Guericke-Str. 68-73, 39104 Magdeburg, Germany;4. Department of Earth and Environmental Sciences, University of Pavia, Via Ferrata 1, I-27100 Pavia, Italy;5. Evolutionary Studies Institute, School for Geosciences, University of the Witwatersrand, Private Bag 3 Wits, Johannesburg 2050, South Africa;6. Iziko South African Museum of Cape Town, P.O. Box 61, Cape Town 8000, South Africa;7. Department of Earth Sciences, Albany Museum, Rhodes University, Grahamstown 6139, South Africa;8. Department of Geology, University of Johannesburg, Kingsway Ave, Auckland Park, Johannesburg 2092, South Africa;9. PO Box 360, Clarens 9707, South Africa;1. School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China;2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;3. Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China;4. Tianjin Branch, China Petroleum Logging CO. LTD., Tianjin 300457, China;5. School of Ocean and Earth Science, Tongji University, Shanghai 200092, China;6. Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Development Research Institute, SINOPEC, Wuxi 214126, China;7. Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Urumqi 830013, China;1. Programa de Pós-graduação em Geologia, Universidade Federal do Paraná, Av. Coronel Francisco Heráclito dos Santos 210, 81531-970 Curitiba, Brazil;2. Géosciences Montpellier, CNRS and Université de Montpellier, Place Eugène Bataillon, 34090 Montpellier, France;3. Instituto de Geociências, Universidade de São Paulo, Rua do Lago 562, 05508-080 São Paulo, Brazil |
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| Abstract: | The ca. 700-km-long Yalu River Fault Zone (YRFZ) in East China, adjacent to the Pacific Ocean, underwent a polyphase evolution during the Cretaceous when it controlled the development of rift basins interrupted by several shortening events. The East China continent lies in an overriding plate with respect to the subducting Paleo-Pacific Plate during the Cretaceous. The YRFZ is ideal for studying the episodicity of stress state in the overriding plate. To constrain the polyphase evolution of the YRFZ, structural observations, fault-slip data measurements and LA–ICP–MS zircon U–Pb dating on Cretaceous volcanic rocks and sandstones were undertaken in this study. The first deformation (D1) is characterized by sinistral strike-slip shear in the earliest Cretaceous. The D2 event is featured by normal faulting deformation along the fault zone, which led to development of rift basins during the rest of the Early Cretaceous. Sinistral faulting (D3) developed again in the earliest Late Cretaceous, followed by dextral normal faulting (D4) and rift basin development during the rest of the Late Cretaceous, and finally reverse dextral faulting (D5) at the end of the Cretaceous. The fault-slip data show that compressional directions during D1, D3 and D5 faulting events are N–S, N–S and E–W respectively. Extensional directions during D2 and D4 faulting events are NW–SE and N–S. The zircon U–Pb ages indicate that the Early Cretaceous basins (D2 event) controlled by the YRFZ were active between 131 and 100 Ma, and the Late Cretaceous basins (D4 event) were active between 97 and 70 Ma. These U–Pb ages, together with previous geochronological data, show that the D1 and D3 episodes of compression each lasted 3 Ma, D2 extension lasted 31 Ma, and D4 extension 27 Ma. These data indicate an episodicity in the stress state with longer periods of extension and shorter periods of compression. A slab-driven model with relatively long periods of low-velocity subduction alternating with shorter periods of high-velocity subduction could account for the episodicity of stress state in the overriding plate from D1 to D5. |
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