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devonian-carboniferous Hangenberg Crisis in South China:Variations in Trace Elements,Strontium and Carbon Isotope Chemostratigraphy in the Nanbiancun Carbonate Section

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Acta Geologica Sinica(English Edition) 2022年第4期96卷 1166-1180页

作者： DENG Faliang LIU Xijun YU Hongxia YAO Ye ZHANG Zhiguo WEI Weilie LI Rui Guangxi Key Laboratory of Hidden Metallic Ore Deposit Exploration College of Earth SciencesGuilin University of TechnologyGuilin 541004China Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources Guilin University of TechnologyGuilin 541004China Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China

The global Hangenberg Crisis or Hangenberg Extinction is a mass extinction near the devonian-carboniferous *** research of petrology and geochemistry on the devonian-carboniferous boundary,as exposed in the Nanbiancun auxiliary stratotype section,South China,elucidates paleoenvironmental changes and controls on marine strontium(^(87)Sr/^(86)Sr)and carbonate carbon(δ^(13)C_(carb))isotopes during the Hangenberg *** new^(87)Sr/^(86)Sr data reveal a regression in the Middle Siphonodella praesulcata Zone,while the Hangenberg Extinction was occurring in South ***,theδ^(13)C_(carb)data records a negative excursion near the base of the Middle Siphonodella praesulcata Zone that may have been connected with the Hangenberg Extinction.A positiveδ^(13)C_(carb)excursion,corresponding with the Upper Siphonodella praesulcata Zone,may reflect the effects of a vigorous biological *** magnitude of the Hangenberg Carbon Isotopic Excursion in peakδ^(13)carb values andδ^(13)C_(carb)gradient in carbonate devonian-carboniferous boundary sections of the South China Craton during the Hangenberg Crisis,are a function of depositional water depth and distance from the *** carbon cycling during the Hangenberg Carbon Isotopic Excursion had a much stronger impact on oceanic surface waters than on the deep ocean and theδ^(13)C_(carb)gradient of local seawater was likely caused by enhanced marine productivity,associated with biological recovery in platform sediments during the Hangenberg Crisis.

关键词： strontium and carbon isotopes Nanbiancun auxiliary stratotype section Hangenberg Crisis devonian-carboniferous boundary South China

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