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《地震学报(英文版)》 2010-06
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Tomographic structure of East Asia:Ⅱ.Stagnant slab above 660 km discontinuity and its geodynamic implications

Yongshun John Chen 1,and Shunping Pei 2,1 1 Computational Geodynamics Laboratory,Department of Geophysics,School of Earth and Space Sciences,Peking University,Beijing 100871,China 2 Key Laboratory of Continental Collision and Plateau Uplift,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100085,China  
P-wave arrival times of both regional and teleseismic earthquakes were inverted to obtain mantle structures of East Asia.No fast(slab) velocity anomalies was not find beneath the 660-km discontinuity through tomography besides a stagnant slab within the transition zone.Slow P-wave velocity anomalies are present at depths of 100-250 km below the active volcanic arc and East Asia.The western end of the flat stagnant slab is about 1 500 km west to active trench and may also be correlated with prominent surface topographic break in eastern China.We suggested that active mantle convection might be operating within this horizontally expanded "mantle wedge" above both the active subducting slabs and the stagnant flat slabs beneath much of the North China plain.Both the widespread Cenozoic volcanism and associated extensional basins in East Asia could be the manifestation of this vigorous upper mantle convection.Cold or thermal anomalies associated with the stagnant slabs above the 660-km discontinuity have not only caused a broad depression of the boundary due to its negative Clapeyron slope but also effectively shielded the asthenosphere and continental lithosphere above from any possible influence of mantle plumes in the lower mantle.
【Fund】: grants(B-11440134 S-12002006)to Dapeng Zhao from the Japan Society for the Promotion of Science;; Support for Shunping Pei came from a postdoct grant of Peking University;; supported by the National Natural Science Foundation of China(Nos.40125011 90814002 and 41074041);; the Chinese Academy of Sciences(No.KZCX2-EW-QN102)
【CateGory Index】: P315.31
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