Reinterpretation of the northern South China Sea pre-Cenozoic basement and geodynamic implications of the South China continent: constraints from combined geological and geophysical records

作     者：Weilin Zhu Yuchi Cui Lei Shao Peijun Qiao Peng Yu Jianxiang Pei Xinyu Liu Hao Zhang Weilin Zhu;Yuchi Cui;Lei Shao;Peijun Qiao;Peng Yu;Jianxiang Pei;Xinyu Liu;Hao Zhang

作者机构：State Key Laboratory of Marine GeologyTongji UniversityShanghai 200092China The Institute for Geoscience Research(TIGeR)School of Earth and Planetary SciencesCurtin UniversityPerth 6845Australia Hainan Energy Co.Ltd.CNOOCHaikou 570145China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2021年第40卷第2期

页      面：13-28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] 0908[农学-水产] 07[理学] 0707[理学-海洋科学] 

基　　金：The National Natural Science Foundation of China under contract Nos 42076066,92055203 and 41874076 the National Science and Technology Major Project under contract Nos 2016ZX05026004-002 and 2017ZX05026005-005 the Fund of China Association for Science and Technology under contract No.2018CASRQNJL18 

主　　题：South China Sea pre-Cenozoic basement U-Pb geochronology Paleo-Pacific subduction intracontinental collision metamorphic belt 

摘      要：The pre-Cenozoic northern South China Sea(SCS)Basin basement was supposed to exist as a complex of heterogeneous segments,divided by dozens of N-S ***,only the Hainan Island and the northeastern SCS region were modestly dated while the extensive basement remains roughly postulated by limited geophysical *** study presents a systematic analysis including U-Pb geochronology,elemental geochemistry and petrographic identification on granite and meta-clastic borehole samples from several key *** from gravity-magnetic joint inversion,this interpretation will be of great significance revealing the tectono-magmatic evolution along the southeastern margin of the Eurasian *** the thick Cenozoic sediments,the northern SCS is composed of a uniform Mesozoic basement while the Precambrian rocks are only constricted along the Red River Fault *** eastern part of the northern SCS below the Cenozoic succession was widely intruded by granites with Jurassic-to-early Cretaceous *** western part,on the other hand,is represented by meta-sedimentary rocks with relatively sporadic granite *** be noted,the western areas derived higher-degree and wider metamorphic zones,which is in contrast with the lowerdegree and narrower metamorphic belt developed in the eastern *** collisions between the Indochina Block and South China continent took place since at least late Triassic,resulting in large-scale suturing and deformation *** the westernmost part of the northern SCS,the intracontinental amalgamation with closure of the Meso-Tethys has caused fairly stronger and broader *** metamorphic biotite granite is located on the suturing belt and yields a Precambrian U-Pb *** likely represents the relict from the ancient Gondwana supercontinent or its ***-continental collision between the Paleo-Pacific and the southeast China Block,on the other hand,results in a relatively narrow NE–SW tren