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paleoenvironmental evolution and Organic Matter Enrichment Genesis of the Late Turonian Black Shale in the Southern Songliao Basin,NE China

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Acta Geologica Sinica(English Edition) 2024年第5期98卷 1338-1358页

作者： BAI Jing XU Xingyou LIU Weibin ZHAO Wenzhi JIANG Hang State Key Laboratory of Continental Shale Oil Beijing 100029China Key Laboratory of Unconventional Oil and Gas China Geological SurveyBeijing 100029China Oil and Gas Survey China Geological SurveyBeijing 100029China Research Institute of Petroleum Exploration Development of PetroChina Beijing 100083China Strategic Research Center of Oil and Gas Resources Ministry of Natural ResourcesBeijing 100860China

The Upper Cretaceous Qingshankou Formation black shales,deposited in the late Turonian(LTB shales),are the main source rocks of the Songliao *** origins of organic matter enrichment of the shales is a contentious subject fuelling many ongoing *** study investigates the genesis of the organic matter-rich shale by using molecular *** LTB shales can be divided into three *** SectionⅠshales were deposited in saline,stratified and anoxic water conditions,which are related to seawater incursion *** least three episodic and periodic seawater incursion events were recognized during SectionⅠshale *** SectionⅡshales deposited in brackish to fresh and deep lake-level conditions with high primary productivity,which are related to lake-level *** SectionⅢshales were deposited under fresh and slightly oxidized water conditions,which are related to lake-level *** organic matter enrichment models for the LTB shales are identified,that is,the seawater incursion model and the maximum lake-level transgression sedimentation model,which act on different shale sections,both playing significant roles in the enrichment of organic matter.

关键词： organic matter-rich shale paleoenvironmental evolution enrichment genetics late Turonian Cretaceous Songliao Basin

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Quaternary Stratigraphic Division and paleoenvironmental evolution Observed from Core LZK1 on Hengsha Island, Shanghai

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Acta Geologica Sinica(English Edition) 2020年第4期94卷 1167-1177页

作者： KE Xue XIE Jianlei ZHANG Zongyan ZOU Yarui WANG Guoquan Institute of Geological Survey China University of GeosciencesWuhan 430074China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China Shanghai Institute of Geological Survey Shanghai 200072China Wuhan Center China Geological SurveyWuhan 430205China Hubei Institute of Geosciences Wuhan 430034China Department of Earth and Atmospheric Sciences University of HoustonHoustonTX 77204USA

The Quaternary sediments in the Yangtze delta are loose and lack precise stratification marks in the lithology. Moreover, due to the limitations of dating methods, it is difficult for Quaternary cores to deliver accurate age constraints. Thus, it is a challenge to establish the Quaternary stratigraphic framework. Gravity core LZK1 was drilled on Hengsha Island, Shanghai, in the Yangtze delta, in 2012. The core was terminated at 403.83 m below the local land surface, the uppermost 291.2 m comprising a thick sequence of Quaternary sediments. This study investigated the stratigraphic subdivision and paleoenvironmental change of the Quaternary sediments. From bottom to top, the Quaternary stratigraphic sequence can be subdivided into the lower Pleistocene Anting Formation, Middle Pleistocene Jiading Formation, Upper Pleistocene Chuansha Formation and Nanhui Formation, Holocene Loutang Formation, Shanghai Formation, and Rudong Formation. According to this study, the Hengsha Island area was dominated by a freshwater lacustrine environment during the early Pleistocene, an alternation of shallow lake and shore lake environment during the Middle Pleistocene, a delta plain to lagoonal environment during the early Upper Pleistocene, a fluvial channel to floodplain environment from the LGM(Last Glacial Maximum) to the end of the Upper Pleistocene, and a delta environment during the Holocene.

关键词： chronostratigraphic framework paleoenvironmental evolution marine transgression Quaternary Yangtze delta

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paleoenvironmental records from the northern South China Sea since the Last Glacial Maximum

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Acta Oceanologica Sinica 2010年第3期29卷 46-62页

作者： GE Qian CHU Fengyou XUE Zuo LIU J Paul DU Yuansheng FANG Yinxia Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China Key Laboratory of Submarine Geosciences State Ocean Administration Hangzhou 310012 China Department of Marine Earth and Atmospheric Sciences North Carolina State University Raleigh NC 27695 USA

Core ZHS-176 contains the paleoenvironmental records from the northern South China Sea （NSCS） since the Last Glacial Maximum （LGM）. A coupled approach based on clay mineral assemblages, planktonic foraminiferal oxygen and carbon isotopes, and calcium carbonate content is used to trace the sources of the fine-grained sediment and to investigate the paleoenviornmental evolution in this area. Clay mineral assemblages are dominated by illite （average about 39%） and chlorite （about 27%）, which comes mainly from Taiwan and the East China Sea. Kaolinite, which accounts for about 13%, comes mainly from the Zhujiang （Pearl） River, and Luzon Island is the main source for smectite （about 21%）. The planktonic foraminiferal oxygen isotopic oscillations during the last glacial period are coeval with climate variations recorded in the Greenland ice core and Western Pacific sediment. These variations include the LGM, Heinrich event 1, Bφlling-Allerφd （B/A）, and Younger Dryas. For the Holocene, three periods of strong precipitation （S1-S3） and three periods of weak precipitation （W1-W3） are identified. The oxygen isotopic record exhibits corre-lation with climate records from distant regions, including the high-latitude Northern Hemisphere, providing evidence for global tele-connection among regional climate. A brief, negative planktonic foraminiferal carbon isotopic excursion during B/A reflects increased methane released from marine gas hydrate due to the rapid warming of the water. By comparing calcium carbonate content curves of the core ZHS-176 with these of other five boreholes lying above the lysocline, a remarkable low calcium carbonate event is found during the early Holocene in NSCS.

关键词： clay mineral oxygen and carbon isotopes calcium carbonate content South China Sea paleoenvironmental evolution

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