Crustal thickness and composition in the South China Block:Constraints from earthquake receiver function

作     者：Changxin CHEN Qingtian LÜ Ling CHEN Danian SHI Jiayong YAN Yinshuang AI Changxin CHEN;Qingtian Lü;Ling CHEN;Danian SHI;Jiayong YAN;Yinshuang AI

作者机构：Chinese Academy of Geological SciencesBeijing 100037China Chinese MNR Laboratory of Deep Earth Sciences and TechnologyBeijing 100094China Key Laboratory of Deep-Earth Dynamics of Ministry of Natural ResourcesInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037China State Key Laboratory of Lithospheric EvolutionInstitute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CAS Center for Excellence in Deep Earth ScienceGuangzhou 510640China University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Earth and Planetary PhysicsInstitute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2022年第65卷第4期

页      面：698-713页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41630320,92062108) the China Geological Survey Project(Grant No.DD20190012) open fund from the Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resource,Institute of Geology,Chinese Academy of Geological Sciences(Grant No.J1901-16) 

主　　题：P wave receiver function The South China Block Crustal thickness Crustal composition Block boundary 

摘      要：Crustal thickness and composition are closely related to geology and tectonic evolution of the *** the differences in the crustal thickness and composition of the South China Block(SCB)is important to gain a comprehensive understanding of multi-phase amalgamation,breakup,reworking,and regional geodynamic *** this study,teleseismic data from 135 high-density portable broadband stations from Sino Probe were processed using Common Conversion Point(CCP)stacking and H-κstacking *** Moho depth and P-wave and S-wave velocity ratio(V_(p)/V_(s))were *** results revealed several insights about the tectonic processes in the ***,the crustal structure and V_(p)/V_(s)ratios of the Cathaysia Block,Jiangnan Orogenic Belt,and Yangtze Block were significantly *** average depth of the Moho in the Cathaysia Block was approximately 31 km,and the V_(p)/V_(s)ratios increased from the inland area(1.66)to the coastal area(1.78),indicating the oceanward increase of mafic proportion in the lower crust,which is related to the influence of the Paleo-Pacific Plate westward ***,the crustal thickness of Jiangnan Orogenic Belt deepens from east ca.31 to the west ca.42 km and the V_(p)/V_(s)ratios varied from 1.75 to 1.64,illustrating a relatively felsic crust,which could have been related to the Mesozoic upper crustal thickening under compression followed by the lower crust removal under the extensional ***,the average crustal thickness of the Yangtze Block was 42 km,and the V_(p)/V_(s)ratios ranged from 1.64 to 1.84,presenting a positive correlation between the Moho depth and the V_(p)/V_(s)ratio,which is explained by the relatively thick mafic lower *** on the variations in the crustal structure and V_(p)/V_(s)ratios of the profile,we inferred that the central part of the Jiangnan Orogenic Belt was bounded by the Jiangshan-Shaoxing-Hengyang in the east and the Jiujiang-Shitai-Jishou in the *** small-scale