Formation of the Zengmu and Beikang Basins,and West Baram Line in the southwestern South China Sea margin

作     者：Bing HAN Zhongxian ZHAO Xiaofang WANG Zhen SUN Fucheng LI Benduo ZHU Yongjian YAO Liqiang LIU Tianyue PENG Genyuan LONG Bing HAN;Zhongxian ZHAO;Xiaofang WANG;Zhen SUN;Fucheng LI;Benduo ZHU;Yongjian YAO;Liqiang LIU;Tianyue PENG;Genyuan LONG

作者机构：Key Laboratory of Ocean and Marginal Sea GeologySouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 511458China Key Laboratory of Marine Mineral ResourcesMinistry of Natural ResourcesGuangzhou 511458China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)Guangzhou 511458China Guangzhou Marine Geological SurveyChina Geological SurveyMinistry of Natural ResourcesGuangzhou 511458China University of Chinese Academy of SciencesBeijing 100049China Hainan Key Laboratory of Marine Geological Resources and EnvironmentHaikou 570206China 

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：592-611页

核心收录：

学科分类：081801[工学-矿产普查与勘探] 081802[工学-地球探测与信息技术] 081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：Supported by the Youth Innovation Promotion Association CAS the National Key Research and Development Program of China(No.2021YFC3100604) the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(No.GML2019ZD0205) the Guangzhou Municipal Science and Technology Program(No.201904010285) the K.C.Wong Education Foundation(No.GJTD-2018-13) the Hainan Key Laboratory of Marine Geological Resources and Environment(No.HNHYDZZYHJKF003) the China Geological Survey(No.DD20190378) the National Natural Science Foundation of China(No.42076077) 

主　　题：tectonic subsidence foreland basin West Baram Line Zengmu Basin Beikang Basin South China Sea 

摘      要：The Zengmu and Beikang basins,separated by the West Baram Line(WBL)in the southwestern South China Sea margin,display distinct geological and geophysical ***,the nature of the basins and the WBL are *** we explore this issue by conducting the stratigraphic and structural interpretation,faults and subsidence analysis,and lithospheric finite extension modelling using seismic *** show that the WBL is a trans-extensional fault zone comprising normal faults and flower structures mainly active in the Late Eocene to Early *** Zengmu Basin,to the southwest of the WBL,shows an overall synformal geometry,thick folded strata in the Late Eocene to Late Miocene(40.4-5.2 Ma),and pretty small normal faults at the basin edge,which imply that the Zengmu Basin is a foreland basin under the Luconia and Borneo collision in the Sarawak since the ***,the basin exhibits two stages of subsidence(fast in 40.4-30 Ma and slow in 30-0 Ma);but the amount of observed subsidence and heat flow are both greater than that predicted by crustal *** Beikang Basin,to the NE of the WBL,consists of the syn-rift faulted sub-basins(45-16.4 Ma)and the post-rift less deformed sequences(16.4-0 Ma).The heat flow(~60 mW/m2)is also consistent with that predicted based on crustal thinning,inferring that it is a rifted ***,the basin shows three stages of subsidence(fast in 45-30 Ma,uplift in 30-16.4 Ma,and fast in 16.4-0 Ma).In the uplift stage,the strata were partly folded in the Late Oligocene and partly eroded in the Early Miocene,which is probably caused by the flexural bulging in response to the paleo-South China Sea subduction and the subsequent Dangerous Grounds and Borneo collision in the Sabah to the east of the WBL.