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Intracontinental subduction and Palaeozoic inheritance of the lithosphere suggested by a teleseismic experiment across the Chinese Tien Shan
Authors:G Poupinet  J-Ph Avouac  M Jiang  S Wei  E Kissling  G Herquel  J Guilbert  A Paul  G Wittlinger  H Su  & J-C Thomas
Institution:LGIT-CNRS, Observatoire, BP 53, 38041 Grenoble –France,;LDG-CEA, BP 12, 91680 Bruyères le Châtel –France,;Chinese Academy of Geological Sciences, Baiwanzhuang Road, 100037 Beijing, China,;ETH, Institute of Geophysics, CH-8092 Zurich, Switzerland,;EOPG-CNRS, 5 rue Descartes, 67084 Strasbourg, France
Abstract:Teleseismic tomography across the Chinese Tien Shan shows that seismic wave speeds in the lithosphere beneath central Tien Shan are high and therefore the lithosphere is not weaker than that beneath the adjacent undeformed Tarim and Junggar basins. There is evidence for significant velocity contrasts within the lithosphere that are presumably inherited from the Palaeozoic collision history. The high-velocity, thick Yili block observed underneath the northern Tien Shan is a clue for shortening by a intracontinental subduction. The observed geometry is consistent with a simple model of intracontinental subduction and suggests that, during orogeny, the lithosphere has remained heterogeneous and has deformed along existing planes of weakness rather than by homogeneous thickening of a particularly weak lithosphere.
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