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The sedimentary record of the Sanshui Basin:Implication to the Late Cretaceous tectonic evolution in the northern margin of South China Sea

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Journal of Oceanology and Limnology 2023年第2期41卷 532-549页

作者： Zhe ZHANG Nianqiao FANG Zhen SUN Key Laboratory of Ocean and marginal Sea Geology Innovation Academy of South China Sea Ecology and Environmental EngineeringSouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 511458China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China University of Chinese Academy of Sciences Beijing 100049China School of Ocean Sciences China University of GeosciencesBeijing 100083China

Whether the South China continental margin had shifted from active subduction to passive extension in the Late Cretaceous remains controversial.Located in the northernmost of the South China Sea continental margin,Sanshui Basin developed continuous stratigraphy from Lower Cretaceous to Eocene and provides precious outcrops to study the regional tectonic evolution during the Cretaceous.Therefore,we conducted field observations,petrology,clay mineralogy,geochemistry,and detrital zircon chronology analyses of sedimentary rocks from the Upper Cretaceous Sanshui Formation in Sanshui Basin.Results suggest that the Sanshui Basin is characterized as an intermoutane basin with multiple provenances,strong hydrodynamic environment,and proximal accumulation in the Late Cretaceous.An angular unconformity at the boundary between the Lower and Upper Cretaceous was observed in the basin.The sedimentary facies of the northern basin changed from lacustrine sedimentary environment in the Early Cretaceous to alluvial facies in the Late Cretaceous.The zircon U-Pb ages of granitic gravelly sandstone from Sanshui Formation prominently range from 100 Ma to 300 Ma,which is close to the deposition age of Sanshui Formation.The major and trace elements of the Late Cretaceous sedimentary samples show characteristics of active continental margin,and are different from the Paleogene rifting sequences.Hence,we propose that the northern South China Sea margin underwent an intense tectonic uplift at the turn of the Early and Late Cretaceous(around 100 Ma).Afterward,the northern South China Sea margin entered a wide extension stage in the Late Cretaceous(~100 to~80 Ma).This extensional phase is related to the back-arc extension in the active continental margin environment,which is different from the later passive rifting in the Cenozoic.The transition from active subduction to passive extension in the northern South China Sea may occur between the late Late Cretaceous and the Paleogene.

关键词： continental margin South China Sea Sanshui Basin Late Cretaceous tectonic transition

Differences in the Tectonic Evolution of Basins in the CentralSouthern South China Sea and their Hydrocarbon Accumulation Conditions

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Acta Geologica Sinica(English Edition) 2021年第1期95卷 30-40页

作者： TANG Wu ZHAO Zhigang SONG Shuang WANG Yibo XIE Xiaojun LIU Shixiang CNOOC Research Institute Co. Ltd.Beijing 100028China

To reveal the causes of differences in the hydrocarbon accumulation in continental marginal basins in the centralsouthern South China Sea,we used gravity-magnetic,seismic,drilling,and outcrop data to investigate the tectonic histories of the basins and explore how these tectonic events controlled the hydrocarbon accumulation conditions in these basins.During the subduction of the Cenozoic proto-South China Sea and the expansion of the new South China Sea,the continental margin basins in the central-southern South China Sea could be classified as one of three types of epicontinental basins:southern extensional-foreland basins,western extensional-strike slip basins,and central extensional-drift basins.Because these basins have different tectonic and sedimentary histories,they also differ in their accumulated hydrocarbon resources.During the Cenozoic,the basin groups in the southern South China Sea generally progressed through three stages:faulting and subsidence from the late Eocene to the early Miocene,inversion and uplift in the middle Miocene,and subsidence since the late Miocene.Hydrocarbon source rocks with marine-continental transitional facies dominated byⅡ-Ⅲkerogen largely developed in extremely thick Miocene sedimentary series with the filling characteristics being mainly deep-water deposits in the early stage and shallow water deposits in the late stage.With well-developed sandstone and carbonate reservoirs,this stratum has a strong hydrocarbon generation potential.During the Cenozoic,the basin groups in the western South China Sea also progressed through the three developmental stages discussed previously.Hydrocarbon source rocks with lacustrine facies,marine-continental transitional facies,and terrigenous marine facies dominated byⅡ2-Ⅲkerogen largely developed in the relatively thick stratum with the filling characteristics being mainly lacustrine deposits in the early stage and marine deposits in the late stage.As a reservoir comprised of self-generated and self-stored sandstone,this unit also has a hi

关键词： tectonic evolution hydrocarbon accumulation continental margin central-southern South China Sea proto-South China Sea

Links among Slope Morphology, Canyon Types and Tectonics on Passive and Active margins in the Northernmost South China Sea

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Journal of China University of Geosciences 2009年第1期20卷 77-84页

作者： Ho-Shing Yu Emmy T Y Chang Institute of Oceanography National Taiwan UniversityTaipei

We examine slope profile types and variations in slope gradient and slope refief with depth for both passive and active margins in the northern most South China Sea. The passive South China margin is characterized by an exponential slope profile, mainly associated with clustered slope-confined canyons. The active Taiwan margin shows a linear-like shape with great variations along the lower slope. Fewer canyons occur on the Taiwan margin, and hence the influence of canyon incision on slope morphology is relatively less significant. Quantitative analyses of slope curvature, slope gradient and square root of relief variance are useful statistical parameters to explain characteristics and variability of morphology of the slope of the South China margin, but not for the Kaoping slope on the Taiwan side. On the active Taiwan margin, tectonic activities are dominant over sediment deposition and surface erosion, producing a slope profile quite different from those of passive margins of the Middle Atlantic, KwaZulu-Natal, South Africa where failure on slope and accompanying canyon incision are the dominant processes shaping the slope morphology.

关键词： slope morphology canyon statistical analysis continental margin South China Sea.

BREAKUP-MAGMATIC TECTONICS MODEL OF SOUTHEAST CHINA CONTINENT

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华东地质 1994年第3期 8-12页

作者： xie Douke(IGMR, Nanjing, 210016)

Mesozoic tectonic evolution model in the southeast margin of Eurasia continent ischaracterized by NNE-SN trend spread-breakup, eastward accretion and continentization ofoceanic crust. During spread-break up process, newly tectonic-magmatic terrane is formed. Alower-velveity layer and a middle-velucity layer occur in the middle crust, and a high-velocitylayer in the lower crust.

关键词： continental margin breakup belts magmatic tectonic terrane

Early Mesozoic tectono-magmatic activity and mineralization in Northeast China:evidence from Re-Os to U-Pb studies of the Taipingchuan porphyry Cu-Mo deposit in the Derbugan metallogenic belt

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Early Mesozoic tectono-magmatic activity and mineralization ...