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Seismic Characteristics and Development Patterns of Miocene Carbonate Platform in the beikang basin,Southern South China Sea

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Acta Geologica Sinica(English Edition) 2020年第5期94卷 1651-1661页

作者： YAN Wei ZHANG Guangxue XIA Bin ZHANG Li YANG Zhen LEI Zhenyu YAO Huiqiang MLR Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyGuangzhou 510075China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 511458China Sun Yat-Sen University Marine InstituteGuangzhou 510075China

The beikang basin is located in the southern part of the South China Sea(SCS),which is one of most tectonically complex sea *** is a deepwater sedimentary basin that was mainly deposited during the Cenozoic *** to data restrictions,the research on carbonate platforms of this area is still in its ***-resolution seismic data are analyzed to identify the Miocene carbonate platforms and reconstruct the architecture and growth *** carbonate platforms of beikang basin began to develop in the Late Oligocene-Early Miocene,were extended in the Middle Miocene,and declined in the Late *** carbonate platform mainly developed during two periods:the Oligocene to the Early Miocene,and the Middle *** carbonate platforms that developed in the Middle Miocene were the most *** Middle Miocene carbonate platform in the beikang basin can be divided into three *** the first stage,the platforms had wide range which were *** the second stage,the platforms had a smaller range that was controlled by *** the third stage,the platforms were gradually *** platform structure developed in the Middle Miocene at the beikang basin was controlled by the rate of rising/falling of the sea level and the carbonate growth *** on an analysis of these changes and relationship,the platform can be divided into several patterns:retrogradation,submerged,aggradation,progradation,outward with up-stepping,outward with down-stepping,and down-stepping *** the top of the carbonate platforms in the beikang basin a set of carbonate wings or mushrooms usually *** were formed during a period of relative sea-level *** is believed that the Miocene carbonate platforms in the beikang basin are mainly controlled by tectonic and sedimentary environments,and are also affected by terrestrial detritus.

关键词： carbonate platform controlling factors Miocene beikang basin South China Sea

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Formation of the Zengmu and beikang basins,and West Baram Line in the southwestern South China Sea margin

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Journal of Oceanology and Limnology 2023年第2期41卷 592-611页

作者： Bing HAN Zhongxian ZHAO Xiaofang WANG Zhen SUN Fucheng LI Benduo ZHU Yongjian YAO Liqiang LIU Tianyue PENG Genyuan LONG Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 511458China Key Laboratory of Marine Mineral Resources Ministry of Natural ResourcesGuangzhou 511458China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 511458China University of Chinese Academy of Sciences Beijing 100049China Hainan Key Laboratory of Marine Geological Resources and Environment Haikou 570206China

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.

关键词： tectonic subsidence foreland basin West Baram Line Zengmu basin beikang basin South China Sea

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