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The Moho Depth of South China Revealed by Seismic Probing

XIONG Xiao-song,GAO Rui,LI Qiu-sheng,LU Zhan-wu,WANG Hai-yan,LI Wen-hui,GUAN Ye Lithosphere Research Center,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037;Key Laboratory of Earthprobe and Geodynamics,Chinese Academy of Geological Sciences,Beijing 100037  
Since the 1970s,lots of research work on seismic detection has been performed in South China.In this paper,the authors have summarized the results of deep seismic sounding,deep seismic profiling and broadband seismic observation and dealt with the variation features of the Moho depth.It is shown that the Moho depth has changed a lot in South China:the depth has on the whole become shallower from the west to the east;the deepest Moho appears in northern Panzhihua-Xichang area in South China continent,and the shallowest Moho lies in Quzhou basin,Zhejiang Province,with the Moho difference between them being 35 km;the Moho offset is existent beneath the marginal fault of South China;the South China Caledonian orogen is shallower than the newest Taiwan orogenic belt;the Moho depth of the East China Sea is quite different from that of the northern South China Sea.These features suggest that different regions have undergone different tectonic evolutions:the relatively great Moho depth in Panzhihua-Xichang area might be related to the eastward mass flow of Qinghai-Tibet plateau,whereas the crustal thinning in South China orogen was caused by the subsequent extension process.The Moho depth difference between the East China Sea and the northern margin of the South China Sea implies that they are located in different continental margins:the former is in an active continental margin,while the latter is in a passive continental margin.
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