Gravity modelling of crustal architecture and heterogeneity in the Nansha Block,South China Sea

作     者：Jialing ZHANG Zhaocai WU Chun-Feng LI Hailong LI Jialing ZHANG;Zhaocai WU;Chun-Feng LI;Hailong LI

作者机构：Key Laboratory of Submarine GeoscienceSecond Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Department of Marine ScienceZhejiang UniversityZhoushan 316021China Sanya InstituteZhejiang UniversitySanya 572025China Laboratory of Marine Mineral ResourcesPilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Gas HydrateMinistry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China 

出 版 物：《Journal of Oceanology and Limnology》 (海洋湖沼学报（英文）)

年 卷 期：2023年第41卷第2期

页      面：630-643页

核心收录：

学科分类：0710[理学-生物学] 070704[理学-海洋地质] 0709[理学-地质学] 07[理学] 0707[理学-海洋科学] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.42076078,41776057,42176055) the Open Foundation of Key Laboratory of Submarine Geosciences,Ministry of Natural Resources(No.KLSG2004) 

主　　题：Nansha Block crustal architecture gravity inversion crustal boudinage 

摘      要：The stretched structure and heterogeneity of the crust of the Nansha Block,the southern continental margin of the South China Sea(SCS),are not well *** used published ocean bottom seismic(OBS)/multichannel reflection seismic(MCS)profiles across the Nansha Block to establish five two-dimensional crustal structure *** gravity modelling with magnetic anomaly inversion,we obtained the distribution of density and local magnetic susceptibility of the *** models show that the distribution of density and thickness of the upper crust in the Nansha Block is uneven,and the thick upper crust is prevalent in the regions close to the continent-ocean transition(COT)showing different *** interpreted Mesozoic granite blocks and Precambrian rigid basement reflects the heterogeneity in the material composition of the SCS continental *** on the thinning styles of different crustal layers,we suggest that the Nansha Block has a three-layer thinning *** uppermost pre-rift layer was deformed via brittle fractures,the upper crust was sheared by discrete shear zones,and the lower crust experienced ductile *** inherited pre-rift thermal regime,mechanical state,and material composition of the SCS continental margin affected the extensional structure of the crust.