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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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Could a Less Developed City Solve Its CO2 Emission Dilemma? Evidence from a Low Carbon Pilot City

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Chinese Journal of Urban and Environmental Studies 2015年第1期3卷 92-111页

作者： JIANG Wei Institute of World Economics and Politics Chinese Academy of Social Sciences

Facing up to the global warming, China has addressed great efforts on low carbon *** the year 2010, it has issued two batches of low carbon pilots. However, not all the pilots produced satisfactory outcomes as expected, while a less developed pilot city, guangyuan got a reassuring result which was considered as a surprise. How do we explain this surprise? Could a less developed city solve its CO2emission dilemma while pursuing the industrialization and urbanization? Using sequential game and multi-case comparison, this paper tries to examine the main drivers of guangyuan’s low carbon initiative and the determinants of its achievement. The analysis shows that guangyuan had no advantages in low carbon potential compared with its reference cities, while the low carbon surprise was due to its strong political willingness and leadership, an effective multi-level governance network and a low carbon oriented evaluation system for local officials. It demonstrates that a less developed city could solve the CO2emission dilemma while seeking its economic growth; technical level, fund, and human resources are important but not dominant; to ensure the implementation of low carbon policies, meeting low carbon objectives should be taken full consideration into the evaluation system for local officials.

关键词： Low carbon pilots multi-level governance guangyuan China

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