Lateral growth of NE Tibetan Plateau restricted by the Asian lithosphere: Results from a dense seismic profile |
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| Institution: | 1. School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;2. Geological Information Centre, Ministry of Land and Resource, Yanjiao 065201, China;3. Chinese Academy of Geological Sciences, Beijing 100037, China;4. Department of Geological Sciences, University of Missouri, Columbia, MO 65211, USA;5. Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, 14473 Potsdam, Germany;6. Freie Universität, Fachrichtung Geophysik, Malteserstrasse 74-100, 12249 Berlin, Germany;7. Earthquake Administration of Guangdong Province, Guangzhou 510070, China;8. Earthquake Administration of Gansu Province, Lanzhou, 730000, China;1. State Key Laboratory of Lithosphere Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China;1. Lithosphere Research Centre, Institute of Geology, CAGS, Beijing 100037, China;2. Key Laboratory of Earth Probe and Geodynamics, Ministry of Land and Resources, Beijing 100037, China;3. Key Laboratory of Continental Dynamics, Ministry of Land and Resources, Beijing 100037, China;4. Geophysical Exploration Division No. 6, Huadong Petroleum Bureau, SINOPEC, Nanjing 210007, China;5. Beijing Petrosound Geoservice Ltd., Beijing 100016, China |
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| Abstract: | We present high-resolution receiver function images along a 700-km long dense seismic array extending from northern Tibetan Plateau to the Alxa block, crossing the entire Qilian thrust belt (QTB). The dense stations, with less than ~2 km station intervals, allow the receiver functions to unveil unprecedented details of crustal structures across the northern frontier of the growing Tibetan Plateau. The migration image shows a thickened and strongly deformed QTB crust, with an uneven Moho and complex internal structures that are indicative of pure-shear shortening. The Alxa block, in contrast, has a thinner crust, a flat Moho, and little internal crustal deformation. These results suggest that the lateral growth of NE Tibetan Plateau is restricted by the strong Asian lithosphere, which shows no visible subduction beneath the Tibetan Plateau as previously suggested. |
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