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End-Guadalupian mass extinction and negative carbon isotope excursion at Xiaojiaba,Guangyuan,Sichuan

Science China Earth Sciences 2012年第9期55卷 1480-1488页

作者： WEI HengYe CHEN DaiZhao YU Hao WANG JianGuo Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of ScienceBeijing 100029China Graduate University of Chinese Academy of Sciences Beijing 100049China

The end-Paleozoic biotic crisis is characterized by two-phase mass extinctions;the first strike,resulting in a large decline of sessile benthos in shallow marine environments,occurred at the end-Guadalupian *** order to explore the mechanism of organisms' demise,detailed analyses of depositional facies,fossil record,and carbonate carbon isotopic variations were carried out on a Maokou-Wujiaping boundary succession in northwestern Sichuan,SW *** data reveal a negative carbon isotopic excursion across the boundary;the gradual excursion with relatively low amplitude(2.15‰) favors a long-term influx of isotopically light 12 C sourced by the emeishan basalt trap,rather than by rapid releasing of gas *** temporal coincidence of the beginning of accelerated negative carbon isotopic excursion with onsets of sea-level fall and massive biotic demise suggests a cause-effect link between *** volcanic activity of the emeishan trap and sea-level fall could have resulted in detrimental environmental stresses and habitat loss for organisms,particularly for those benthic dwellers,leading to their subsequent massive extinction.

关键词： mass extinction emeishan trap sea-level fall carbon cycle end-Guadalupian Guangyuan SW China

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End-Guadalupian mass extinction and negative carbon isotope excursion at Xiaojiaba,Guangyuan,Sichuan

End-Guadalupian mass extinction and negative carbon isotope ...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： WEI HengYe CHEN DaiZhao YU Hao WANG JianGuo Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of Science Graduate University of Chinese Academy of Sciences

The end-Paleozoic biotic crisis is characterized by two-phase mass extinctions;the first strike,resulting in a large decline of sessile benthos in shallow marine environments,occurred at the end-Guadalupian *** order to explore the mechanism of organisms’ demise,detailed analyses of depositional facies,fossil record,and carbonate carbon isotopic variations were carried out on a Maokou-Wujiapmg boundary succession in northwestern Sichuan,SW *** data reveal a negative carbon isotopic excursion across the boundary,the gradual excursion with relatively low amplitude(2.15‰) favors a long-term influx of isotopically light C sourced by the emeishan basalt trap,rather than by rapid releasing of gas *** temporal coincidence of the beginning of accelerated negative carbon isotopic excursion with onsets of sea-level fall and massive biotic demise suggests a cause-effect link between *** volcanic activity of the emeishan trap and sea-level fall could have resulted in detrimental environmental stresses and habitat loss for organisms,particularly for those benthic dwellers,leading to their subsequent massive extinction.

关键词： mass extinction emeishan trap sea-level fall carbon cycle end-Guadalupian Guangyuan SW China

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