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Journal of Oceanology and Limnology 2020年第6期38卷 1746-1754页

作者： XIU Chun DU Ming ZHANG Xu HUO Suxia North China Sea Environmental Monitoring Center of Ministry of Natural Resources Qingdao 266033China East Sea marine Environmental Investigating and Surveying Center of Ministry of Natural Resources Shanghai 200137China

Changes in the marine productivity and sedimentary environment since the last deglaciation in the Ross Sea are presented in this *** has replaced calcium carbonate as the major biogenic component and has a significantly positive correlation with total organic carbon(TOC),which indicates that siliceous phytoplankton controlled the absorption and release of carbon by the biological pump and was the main producer of marine organic *** the AMS 14C age framework,foraminiferal fossils and redox sensitive elements(RSEs),we found that both the sedimentary environment and marine productivity changed clearly in^11 cal ka BP,which is more likely related with the melting and retreat of the Ross Ice *** addition,the increase of marine productivity promoted the sinking of more organic-matter to the seabed.A large proportion of oxygen in the bottom water body was consumed and more carbon dioxide was produced during the decomposition of organic matter,making the bottom water body more soluble to calcium carbonate.

关键词： biogenic components marine productivity redox environment ice shelf retreat the Ross Sea

Biogenic silica concentration as a marine primary productivity proxy in the Holsteinsborg Dyb, West Greenland, during the last millennium

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Acta Oceanologica Sinica 2020年第9期39卷 78-85页

作者： Longbin Sha Dongling Li Yanguang Liu Bin Wu Yanni Wu Karen Luise Knudsen Zhongqiao Li Hao Xu Department of Geography and Spatial Information Techniques Ningbo UniversityNingbo 315211China Laboratory for marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200062China Key Laboratory of marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Key Laboratory of marine Ecosystem and Biogeochemistry Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Centre for Past Climate Studies and Arctic Research Centre Department of GeoscienceAarhus UniversityAarhus C DK-8000Denmark

We analyzed the biogenic silica(BSi)content and produced a diatom-based summer sea-surface temperature(SST)reconstruction for sediment core GC4 from the Holsteinsborg Dyb,West *** aim was to reconstruct marine productivity and climatic fluctuations during the last *** BSi content and diatom abundance suggest relatively high marine productively during the interval of AD 1000–1400,corresponding in time to the Medieval Warm Period(MWP).The summer SST reconstruction indicates relatively warm conditions during AD 900–1100,followed by cooling after AD *** extended cooling period during AD 1400–1900 is characterized by prolonged low in reconstructed SST and high sea-ice *** BSi values fluctuated during this period,suggesting varying marine productivity during the Little Ice Age(LIA).There is no significant correlation between the BSi content and SST during the last millennium,suggesting that the summer SST has little influence on marine productively in the Holsteinsborg Dyb.A good correspondence between the BSi content and the element Ti counts in core GC4 suggests that silicate-rich meltwater from the Greenland ice sheet was likely responsible for changes in marine productively in the Holsteinsborg Dyb.

关键词： biogenic silica marine productivity sea-surface temperature sea-ice concentration

Sedimentary paleoenvironment and its control on organic matter enrichment in the Mesoproterozoic hydrocarbon source rocks in the Ordos Basin,southern margin of the North China Craton

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Petroleum Science 2024年第4期21卷 2257-2272页

作者： Zhi-Chen Wu Ju-Ye Shi Tai-Liang Fan Ming Jiang School of Energy Resources China University of Geosciences(Beijing)Beijing100083China Key Laboratory of marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism Ministry of EducationChina University of Geosciences(Beijing)Beijing100083China

The black shale of the Mesoproterozoic Cuizhuang Formation in the Changcheng System in Yongji city,North China Craton,is a potential source *** the organic matter enrichment mechanism is crucial for evaluating source rock resources and understanding oil and gas accumulation *** this study,we evaluated the sedimentary paleoenvironment and organic matter enrichment mechanisms of shale using thin section observations,mineral composition analysis,organic geochemistry,and elemental *** found significant differences in the sedimentary paleoenvironment and organic matter enrichment mechanisms between the lower Cuizhuang Formation and the Beidajian Formation *** Cuizhuang Formation was deposited in a late-stage,restricted basin environment during the rift phase,and elemental and geochemical indicators showed that the Cuizhuang Formation was in a suboxic-anoxic water environment,that was influenced by a warm and humid paleoclimate and submarine hydrothermal activities,which promoted the accumulation of organic ***,the enrichment of organic matter in the Cuizhuang Formation was mainly controlled by redox *** formation of suboxic-anoxic water environments may be closely related to the warm and humid paleoclimate and submarine hydrothermal *** conditions promote continental weathering and increase marine productivity,thereby consuming oxygen in the bottom ***,acidic hydrothermal activity also helps to establish an anoxic *** results reveal the effects controlling various coupled mechanisms dominated by redox conditions,which may explain the development of source rocks in the Cuizhuang Formation.

关键词： Cuizhuang formation Paleoproterozoic source rocks marine productivity Paleoenvironments Submarine hydrothermal activity Organic matter enrichment

Microfossil Assemblages and Indication of the Source and Preservation Pattern of Organic Matter from the Early Cambrian in South China

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Journal of Earth Science 2022年第3期33卷 802-819页

作者： Shucan Zheng Qinglai Feng Sebastiaan van de Velde Shan Chang Lei Zhang Bo Gao School of Architectural Engineering Huanggang Normal UniversityHuanggang 438000China State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China Department of Earth and Planetary Sciences University of CaliforniaRiversideCA 92521USA Petroleum Exploration and Production Research Institute SINOPECBeijing 100083China

The beginning of the Phanerozoic was marked by abundant phytoplankton,the occurrence of animals and a newly established ecosystem structure,which in turn,resulted in different modes of organic matter(OM)cycling and *** this study,we present an integrated paleontological and geochemical study of the Lower Cambrian Yanjiahe and Shuijingtuo formations in the Three Gorges area,South *** samples were analyzed for major and trace elements,in order to evaluate the marine *** samples were recovered using palynological methods,destructive analytical techniques,SEM analysis and thin section *** organic-walled microfossils in the investigated sections include marine microphytoplankton,linings of sponge spicules,small shelly fossils and some unnamed sheet-like and net-like microfossils(animal parts).Additionally,fecal structures and coprolites fossils were *** intervals in the Luojiacun Section were proposed to discuss the links among microfossil assemblages and their influence on OM cycling and *** found that the marine microphytoplankton was the main source of OM in the investigated *** appearance of fecal structures groups and massive appearance of animals in the pelagic zone indicate a higher transfer efficiency of OM aggregates through the water *** conditions in the water-column would have led to a moderate to low preservation of OM,an effect which would have been further enhanced by the potential presence of ***,our study reveals the contribution of various organisms to the sedimentary OM and highlights the links and feedbacks among microfossil assemblages,OM recycling efficiency and OM preservation in the tipping point of the Phanerozoic“new world”.

关键词： phytoplankton marine productivity animals fecal structures redox conditions OM recycling efficiency