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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

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Acta Oceanologica Sinica 2021年第2期40卷 13-28页

作者： Weilin Zhu Yuchi Cui Lei Shao Peijun Qiao Peng Yu Jianxiang Pei Xinyu Liu Hao Zhang State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China The Institute for Geoscience Research(TIGeR) School of Earth and Planetary SciencesCurtin UniversityPerth 6845Australia Hainan Energy Co. Ltd.CNOOCHaikou 570145China

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

关键词： South China Sea pre-cenozoic basement U-Pb geochronology Paleo-Pacific subduction intracontinental collision metamorphic belt

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basement of the South China Sea Area:Tracing the Tethyan Realm

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Acta Geologica Sinica(English Edition) 2011年第3期85卷 637-655页

作者： LIU Hailing ZHENG Hongbo WANG Yanlin LIN Qiujin WU Chaohua ZHAO Meisong DU Yunkong Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

The basement of the South China Sea（SCS）and adjacent areas can be divided into six divisions（regions）-Paleozoic Erathem graben-faulted basement division in Beibu Gulf,Paleozoic Erathem strike-slip pull-apart in Yinggehai waters,Paleozoic Erathem faulted-depression in eastern Hainan,Paleozoic Erathem rifted in northern Xisha（Paracel）,Paleozoic Erathem strike-slip extending in southern Xisha,and Paleozoic-Mesozoic Erathem extending in Nansha Islands（Spratly）*** pre-cenozoic basement in the SCS and Yunkai continental area are coeval within the Tethyan tectonic domain in the pre-cenozoic *** are formed on the background of the Paleo-Tethyan tectonic domain,and are important components of the Eastern Tethyan multi-island-ocean *** branches of the Eastern Paleo-Tethys tectonic domain,North Yunkai,North Hainan,and South Hainan sea basins,have evolved into the North Yunkai,North Hainan,and South Hainan suture zones, *** shows a distinctive feature of localization for the pre-cenozoic *** Qiongnan（*** Hainan）Suture Zone on the northern margin of the South China Sea can be considered the vestige of the principal ocean basin of Paleo-Tethys,and connected with the suture zone of the Longmucuo-Shuanghu belt-Bitu belt-Changning-Menglian-Bentong-Raub belt,the south extension of Bitu-Changning-Menglian-Ching Mai belt-Chanthaburi-Raub-Bentong belt on the west of South China Sea,and with the Lianhua-Taidong suture zone（a fault along the east side of Longitudinal Valley in Taiwan）-Hida LP/HT（low pressure-high temperature）metamorphic belt-Hida -marginal HP/LT metamorphic belt in southwestern Honshu of Japan,on the east of the South China *** Qiongbei（North Hainan）suture zone may eastwards extended along the Wangwu-Wenjiao fault zone,and connects with the Lufeng-Dapu-Zhenghe-Shangyu（Lianhuashan）deep fault zone through the Pearl River Mouth *** Meso-Tethys developed on the south of the South China *** Nansha Trough may be

关键词： pre-cenozoic basement East Tethys tectonic domain Tethyan sutures tectonic framework tectonic evolution South China Sea

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