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Preliminary Estimation of Paleoproductivity via TOC and Habitat Types:Which Method Is More Reliable?—A Case Study on the ordovician-silurian transitional Black Shales of the Upper Yangtze Platform, South China

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Journal of China University of Geosciences 2008年第5期19卷 534-548页

作者：苏文博王永标 Bradley D Cramer Axel Munnecke 李志明傅力浦 School of the Earth Sciences and Resources China University of GeosciencesBeijing 100083 China Key Laboratory of Biogeology and Environmental Geology of Ministry of Education China University of GeosciencesWuhan 430074 China Faculty of Earth Sciences China University of GeosciencesWuhan 430074 China Division of Geological Sciences School of Earth Sciences The Ohio State UniversityColumbus Ohio 43210 USA GeoZentrum Nordbayern Fachgruppe Paloumwelt Universitt ErlangenErlangen D-91054 Germany Xi’an Institute of Geology and Mineral Resources Chinese Academy of Geological SciencesXi’an 710054 China

New total organic carbon （TOC） data from the two ordovician-silurian transitional graptolite-bearing black shale intervals, the Wufeng （五峰） Formation and the Longmaxi （龙马溪） Formation in Central Guizhou （贵州） and West Hubei （湖北）, respectively, as well as previously reported TOC data from the same intervals in other places on the Yangtze platform of South China, have been used to produce an initial estimate of the primary paleoproductivity via a conventional inverse method （i.e., ***）. The values of the *** are estimated to be 32 （43-21） gC/（m^2·a）（Wufeng Formation） and 21 （27-16） gC/（m^2·a）（Longmaxi Formation）. Also, simultaneously, the habitat types （i.e., HT; cf., BA： benthic assemblage） and their temporal and spatial changes have been documented from the same succession, and an initial estimate of the primary paleoproductivity has been produced using a forward method （i.e., Rpp-forward） Beingbounded mainly by the peritidal to inner-shelf environment shelly-facies or mixed-facies successions with BA1 to BA3 faunas both at the top and the base, which indicates the habitat types from HT Ⅱ to HT Ⅲ2, the biohabitat type of the two graptolite-bearing black shale intervals can be limited to HT III to HT IV, corresponding to the inner shelf to the outer shelf, with depths from roughly 60 m to 200-300 m. Based on the current data from the South China Sea and the southern part of the East China Sea, values of Rpp-forward should be about 100 to 400 gC/（m^2·a）. The difference in the results via the two methods suggests that paleoproductivity estimates from the geological strata need to be made cautiously, with particular attention paid to the paleogeographic setting, oxic-anoxic conditions, as also the preservation factor of organic carbon.

关键词： primary productivity black shale TOC habitat type (HT) ordovician-silurian transition South China.

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α-and β-diversity Change of Late ordovician Hirnantia Fauna of Changning,Sichuan,Southwest China

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Acta Geologica Sinica(English Edition) 2011年第2期85卷 330-339页

作者： ZHAN Renbin LIU Jianbo LIANG Yan LI Guipeng State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology the Chinese Academy of Sciences Nanjing 210008 China School of Earth and Space Sciences Peking University Beijing 100871 China

A continuous ordovician-silurian boundary section from the upper Wufeng Formation through the Kuanyinchiao Formation to the lower Lungmachi Formation has been carefully measured and collected at Shuanghe of Changning, southern Sichuan Province. For the first time, the temporal changes of α- and β-diversities of the Hirnantia fauna have been discussed in great detail. The general trend of brachiopod diversity change, increasing upward, is consistent with the regional trend of the Yangtze Platform, which had been controlled by both intrinsic and extrinsic factors. However, the sudden drop of diversity for a short period in the upper Kuanyinchiao Formation might have been controlled by environmental factors rather than normal faunal turnover. Synecological analysis using numerical methods recognizes two brachiopod-dominated associations of the Hirnantia fauna, the Dalmanella-Kinnella Association and the Mirorthis Association, both living in an offshore, deeper water environment corresponding to BA3-upper BA4, particularly lower BA3.

关键词： Brachiopods Kuanyinchiao Formation ordovician-silurian transition Shuanghe of Changning

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Upwelling current and its relationship to the enrichment of organic matter in the Lower silurian Longmaxi Formation,northern Chongqing-western Hubei area,southern China

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Journal of Palaeogeography 2024年第4期13卷 993-1015页

作者： Jun-Jun Shen Jia-Kai Yan Peng-Wan Wang Yu-Man Wang Lin Zhou Yu-Bing Ji Min Xu Hubei Cooperative Innovation Center of Unconventional Oil and Gas of Yangtze University Wuhan 430100Hubei ProvinceChina Hydrogeology and Engineering Geology Institute of Hubei Geological Bureau Jingzhou 434020Hubei ProvinceChina PetroChina Hangzhou Institute of Petroleum Geology Hangzhou 310023Zhejiang ProvinceChina PetroChina Research Institute of Petroleum Exploration and Development Bejing 100083China Exploration and Production Research Institute Jianghan Oifield CompanySINOPECWuhan 430100Hubei ProvinceChina Zhejiang Oilfield Company Integrated Center of Exploration and Development Hangzhou 310000Zhejiang ProvinceChina

Upwelling currents play a crucial role in the enrichment of organic matter,yet the mechanisms driving this process remain incompletely understood due to methodological and data resolution *** this paper,we employ a combination of biostratigraphic classification,qualitative methods,and quantitative methods to systematically analyze the sedimentological and geochemical characteristics of the Lower silurian Longmaxi Formation in the northern Chongqing-western Hubei area,southern *** relationship between the upwelling currents and organic matter enrichment in the shale of the Longmaxi Formation is *** indicate that the upwelling currents in the study area were primarily influenced by the foreland flexure *** the Rhuddanian(flexure-sedimentation stage)to the Aeronian(flexure-migration stage),the more intense tectonic activity led to gradual opening of the barrier between the South Qinling Ocean and the Yangtze Platform,resulting in an increase in the influx of the oceanic *** upwelling currents significantly contributed to the organic matter production,albeit without substantially affecting the preservation *** the succession of the Longmaxi Formation,the organic matter content decreased gradually from the passive continental margin to the foreland flexural stagnant basin,which was mainly due to deterioration of the preservation conditions as a result of sea level fall and increased terrigenous *** the increase in the upwelling currents,they did not decisively control the organic matter ***,during the Rhuddanian to Aeronian period,the organic matter content decreased similarly from the passive continental margin to the foreland flexural stagnant basin,influenced by reduced organic matter production caused by weakening of the upwelling currents and the worsening preservation conditions caused by sea-level *** terrigenous input had a relatively minor *** results of t

关键词： Middle-Upper Yangtze ordovician-silurian transition Black shale Passive continental margin Foreland flexural stagnant basin Sedimentary paleoenvironment

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