Geophysical evidence on segmentation of the Tancheng-Lujiang fault and its implications on the lithosphere evolution in East China |
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| Institution: | 1. Institute of Theoretical and Applied Geophysics, School of Earth and Space Sciences, Peking University, Beijing, China;2. School of Oceanography, South University of Science and Technology of China, Shenzhen, China;1. State Key Laboratory of Continental Dynamics, Northwest University, Xi''an, Shaanxi 710069, China;2. CNOOC China Limited, Tianjin 300452, China;3. Center for Global Tectonics, State Key Lab for Geologic Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;1. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. Department of Geology, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA;3. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;4. Earthquake Administration of Guangdong Province, Guangzhou 510070, China;5. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;6. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The north–south trending Tancheng-Lujiang (Tanlu) fault belt extends from northeast China to the Dabie–Sulu orogenic belt, for a length of more than 3000 km. This fault belt probably has close links with the lithosphere evolution, seismic activity and mineral resource concentration in East China. Surface geological mapping and studies on sedimentation and basin formation have indicated segmentation at the southern, middle and northern domains of the fault. Here we employ geophysical constraints to evaluate these fault segments. Unlike previous geophysical studies focused on laterally varying crust/mantle seismic velocity structure across the fault, in this study we have integrated a variety of geophysical data sets, such as crustal P-wave velocity, earthquake occurrence and released seismic energy, seismogenic layer thickness, surface heat flow and geothermal field, to understand the deep structure and strength of the lithosphere along the Tanlu segmented fault belt. The results demonstrate remarkable crustal-scale north-to-south segmentation this major fault. The geophysical evidence and some geochemical constraints suggest that the Tanlu fault belt probably served as a channel for melt and fluid percolation, and exerted a significant control on the lithosphere evolution in East China. |
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| Keywords: | P-wave velocity Seismicity Crustal rheology Geothermal field Segmentation properties Tanlu fault |
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