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《Chinese Journal of Geophysics》 2018-03
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The crust-mantle transition structures beneath eastern China

SUN WeiJia;FU LiYun;WEI Wei;LIN Yi;TANG QingYa;Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics, Chinese Academy of Sciences;Institutions of Earth Science,Chinese Academy of Sciences;School of Geosciences,China University of Petroleum(East China);Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics, Chinese Academy of Sciences;  
The Moho is a discontinuity separating the crust from the mantle.However,the Moho cannot be simply represented by a sharp discontinuity but a transition with thickness ranging from several kilometers to tens of kilometers.The transition could reveal the interactions between the crust and the mantle.Combining the results of deep seismic sounding,wide-angle seismic refractions and high-temperature high-pressure experiments,the paper determines the range of P wave speed of the crust-mantle transition to be 6.8~7.5 km·s-1.The mean thickness of the crust-mantle transition is 5~10 km beneath eastern China.The thinnest crust-mantle transition occurs beneath Sichuan Basin,the core of Yangtze Craton.The crust-mantle transition beneath Trans-North China Orogen(TNCO)is as thick as ~30 km.With geochemical evidences,the thick crust-mantle transition might be attributed to underplating and accumulation of mantle magma.
【Fund】: 国家自然科学基金项目(41720104006 41630210);; 中国科学院青年创新促进会(2017094)联合资助
【CateGory Index】: P315.2
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