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Characteristics of Paleontological Communities in Surface Sediments of the southern south china sea and Their Paleoclimatic and Paleoenvironmental Significance

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Journal of Earth Science 2024年第1期35卷 144-154页

作者： Jing Zhao Li Zhang Xiaoyan Wang Jinglian Ge Min Xu Wei Chen Mao Luo Qianyong Liang Qiuhua Yu Shuaibing Luo Wenkun Qie Key Laboratory of Marine Mineral Resoures Ministry of Natural ResourcesGuangzhou Marine Geological SurveyChina Geological SurveyGuangzhou 511458China National Engineering Research Center for Gas Hydrate Exploration and Development Guangzhou 511458China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China

Understanding the spatial and temporal distribution of different paleontological communities in the southern south china sea(SCS)is fundamental to explore its paleoclimatic and paleoenvironmental *** this study,foraminifera,pollen and diatoms from 100 surface sediment samples covering 40000 km^(2) of sea floor in the southern SCS were comprehensively investigated in terms of their assemblage and *** results showed the existence of abundant foraminifera and pollen in most of the samples,although diatom communities were relatively *** were dominated by ***,***,***,while diatoms were characterized by ***,*** and ***,indicating a typical tropical marine *** pollen assemblages showed a better reflection of montane rainforest,tropical rainforest and *** spatial differences among foraminifera assemblages may indicate the effect of water depth and a warmer environment in the southeast part of the study area,while the spatial patterns of diatom and pollen assemblages imply the influence of coastal *** study also noted that the compositions of paleontological communities in the SCS can vary significantly in a short distance,and synthesized studies on multiple biological groups are needed to reconstruct the Quaternary climate and the oceanographic environment.

关键词： southern south china sea sediments foraminifera diatom pollen

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Late Eocene–early Miocene provenance evolution of the Crocker Fan in the southern south china sea

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Acta Oceanologica Sinica 2023年第3期42卷 215-226页

作者： Yuchi Cui Lei Shao Wu Tang Peijun Qiao Goh Thian Lai Yongjian Yao State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China Earth Dynamics Research Group The Institute for Geoscience Research(TIGeR)School of Earth and Planetary SciencesCurtin UniversityGPO Box U1987Australia china National Offshore Oil Corporation(CNOOC)Research Institute Co. Ltd.Beijing 100028China Department of Earth Sciences and Environment Faculty of Science and TechnologyUniversity Kebangsaan MalaysiaBangi 43600SelangorMalaysia Guangzhou Marine Geological Survey Ministry of Natural ResourcesGuangzhou 510075China

There are many large-scale Cenozoic sedimentary basins with plentiful river deltas,deep-water fans and carbonate platforms in the southern south china *** Crocker Fan was deposited as a typical submarine fan during the late Eocene–early Miocene,and stretches extensively across the entire Sarawak–Sabah of the northern Borneo ***,systematic analyses are still lacking regarding its sediment composition and potential source *** consensus has been reached yet on the provenance evolution and sedimentary infilling processes,which seriously impeded the oil-and-gas exploration *** combining with sedimentaryfacies identification,heavy mineral assemblages,elemental geochemistry and detrital zircon U-Pb dating,this paper aims to generalize an integrated analysis on the potential provenance terranes and restore source-to-sink pathways of the Crocker *** general,the Crocker Fan was initially formed over the Cretaceous–lower/middle Eocene Rajang Group by an angular Rajang *** continual southward subduction of the protosouth china sea resulted in magmatic activities and subsequent regional deformation and thrusting along the Lupar Line in the northern *** lowermost Crocker sequence is featured by a thick conglomerate layer sourced from in-situ or adjacent *** the late Eocene to the early Miocene,the Crocker Fan was constantly delivered with voluminous detritus from the Malay Peninsula of the western *** Zengmu Basin was widely deposited with delta plain and neritic facies sediments,while the Brunei-Sabah Basin,to the farther east,was ubiquitously characterized by turbiditic *** Crocker Fan successions are overall thick layers of modest-grained sandstones,which formed high-quality reservoirs in the southern south china sea region.

关键词： source-to-sink analysis zircon U-Pb age submarine fan Malay Peninsula southern south china sea

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Observations of upper layer turbulent mixing in the southern south china sea

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Acta Oceanologica Sinica 2015年第11期34卷 6-13页

作者： SHANG Xiaodong QI Yongfeng CHEN Guiying LIANG Changrong State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences

A turbulent microstructure experiment was undertaken at a low latitude of 10°N in the south china sea in late August 2012. The characteristics of the eddy diffusivity above 650 m were analyzed, which is one order of magnitude larger than that in the open ocean at that low latitude. Enhanced eddy diffusivities by strong shears and sharp changes in topography were observed. The strongest eddy diffusivity occurred in the mixed layer, and it reached O（10^-2 m^2/s）. Strong stratification in the thermocline inhibited the penetration of surface eddy diffusivities through the thermocline, where the mixing was weakest. Below the thermocline, where the background eddy diffusivity was approximately O（10^-6 m^2/s）, the eddy diffusivity increased with depth, and its largest value was O（10^-3 m^2/s）.

关键词： southern south china sea turbulent mixing dissipation rate topography

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Late Neogene radiolarian absence event in the southern south china sea and its paleoceanographic implication

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Progress in Natural Science:Materials International 2008年第3期18卷 281-287页

作者： Lili Zhanga,b, Muhong Chena, Lanlan Zhanga,b, Jun Lua, Rong Xianga a Key Laboratory of Marginal sea Geology, south china sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, china b Graduate University of Chinese Academy of Sciences, Beijing 100039, china Key Laboratory of Marginal sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

Down-core variations of radiolarians at ODP Site 1143 in the southern south china sea (SCS) are presented for the last 12 Myr. The fluctuations of radiolarian abundances since the Late Miocene can be divided into three stages: a high abundance stage at 12-5.96 Myr, a radiolarian absent stage at 5.96-3.30 Myr and a gradual increasing stage after 3.30 Myr. The three stages correspond to the forming and vicissitudes of the Western Pacific Warm Pool (WPWP) and the Eastern Asian Summer Monsoon (EASM). The radiolarian absence event (RAE) was also absent of diatom and occurred nearly simultaneously with the closures of the Panama Isthmus and the Indonesian seaway, which probably caused the reorganization of oceanic circulation systems. Accompanied this circulation reorganization was the weakening of the WPWP and the EASM, which probably led to a weakened upwelling in the southern SCS. In addition dissolved silica (Dsi) content in surface seawater might be very low during 5.96-3.30 Myr due to the ’’biogenic bloom" event, which consumed a large amount of Dsi in the surface seawater. All these factors together might lead to a great decrease of siliceous production in the southern SCS and consequently caused the RAE. Moreover, the dissolution of siliceous skeletons might also influence the abundance of radiolarians.

关键词： southern south china sea Late Neogene Radiolarian absence event

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Diagnosis of the ENSO modulation of tropical cyclogenesis over the southern south china sea using a genesis potential index

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Acta Oceanologica Sinica 2012年第5期31卷 54-68页

作者： WANG Lei ZHANG Qiongwan LI Weibiao State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China State Key Laboratory of Satellite Ocean Environmental Dynamics Second Institute of OceanographyState Oceanic AdministrationHangzhou 310012China Department of Atmospheric Sciences School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China Institute of Tropical and Marine Meteorology China Meteorological AdministrationGuangzhou 510058China

The modulation of tropical cyclogenesis over the southern south china sea （SSCS） by the El Nin o- southern Oscillation （ENSO） is examined in October–December （OND）, when tropical cyclone （TC） activities are most active in this region. The results reveal that there were more TCs formed over the SSCS during La Nin a years and less TCs during El Nin o years. How different environmental factors （including low-level vorticity, mid-level relative humidity, vertical wind shear, and potential intensity） contribute to this influence is investigated, using a genesis potential （GP） index developed by Emanuel and Nolan. Composite anomalies of the GP index are produced for El Nin o and La Nin a years separately, which could account for the changes of TC frequency over the SSCS in different ENSO phases. The degree of contribution by each factor is determined quantitatively by producing composites of modified indices in which only one of the contributing factors varies, with the others set to climatology. The results show that the mid-level relative humidity makes the largest contribution to the ENSO modulation of tropical cyclogenesis over the SSCS. Although warmer sea surface temperatures （SSTs） and larger amount of evaporation from the ocean surface were observed over the SSCS during El Nin o years, anomalous descending motions due to the anomalous Walker circulations inhibited the upward transports of water vapor and led to less moisture contents in the middle troposphere, which suppressed TC formations.

关键词： tropical cyclone southern south china sea ENSO genesis potential index

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The gradual subduction-collision evolution model of Proto-south china sea and its control on oil and gas

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Acta Oceanologica Sinica 2023年第3期42卷 123-137页

作者： Xiaojun Xie Wu Tang Gongcheng Zhang Zhigang Zhao Shuang Song Shixiang Liu Yibo Wang Jia Guo china National Offshore Oil Corporation(CNOOC)Research Institute Co. Ltd.Beijing 100028China

This study involved outcrop,drilling,seismic,gravity,and magnetic data to systematically document the geological records of the subduction process of Proto-south china sea(PSCS)and establish its evolution *** results indicate that a series of arc-shaped ophiolite belts and calcalkaline magmatic rocks are developed in northern Borneo,both of which have the characteristics of gradually changing younger from west to east,and are direct signs of subduction and collision of *** the same time,the subduction of PSCS led to the formation of three accretion zones from the south to the north in Borneo,the Kuching belt,Sibu belt,and Miri *** sedimentary formation of northern Borneo is characterized by a three-layer structure,with the oceanic basement at the bottom,overlying the deep-sea flysch deposits of the Rajang–Crocker group,and the molasse sedimentary sequence that is dominated by river-delta and shallow marine facies at the top,recording the whole subduction–collision–orogeny process of ***,seismic reflection and tomography also confirmed the subduction and collision of *** on the geological records of the subduction and collision of PSCS,combined with the comprehensive analysis of segmented expansion and key tectonic events in the south china sea,we establish the“gradual”subduction-collision evolution model of *** the late Eocene to middle Miocene,the Zengmu,Nansha,and Liyue–Palawan blocks were separated by West Baram Line and Balabac Fault,which collided with the Borneo block and Kagayan Ridge successively from the west to the east,forming several foreland basin systems,and PSCS subducted and closed from the west to the *** subduction and extinction of PSCS controlled the oil and gas distribution pattern of southern south china sea(SSCS)mainly in three ***,the“gradual”closure process of PSCS led to the continuous development of many large deltas in ***,the deltas formed during the subduction–collision of PS

关键词： Proto-south china sea gradual subduction-collision evolution model oil and gas distribution southern south china sea Borneo

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