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- W2623250964 abstract "Abstract The Guadalupian mass extinction took place during the major global environmental changes during Phanerozoic time. Large-scale sea-level fluctuations and a negative shift of δ 13 C were associated with this crisis. However, the diagenetic or primary origin of the decreased δ 13 C across the Guadalupian–Lopingian (G–L) boundary and the potential causes for this biotic crisis are still being intensely debated. Integrated analyses, including detailed petrographic examination, identification of foraminifer and fusulinid genera, and analysis of carbonate δ 13 C carb and bulk δ 13 C org across the G–L boundary were therefore carried out at Tianfengping, Hubei Province, South China. Our results show that: (1) some foraminifer and most fusulinid genera disappear in the upper Maokou Formation (upper Guadalupian); (2) the negative shift of δ 13 C carb in the uppermost Maokou Formation is of diagenetic origin, but the values of δ 13 C carb in the remainder of the Maokou Formation and in the Wuchiaping Formation represent a primary signal of coeval seawater; and (3) the bulk δ 13 C org perturbation across the G–L boundary at Tianfengping is mainly controlled by organic matter (OM) source, that is, terrestrial OM contribution. We suggest that the δ 13 C carb negative shift in the lower Wuchiaping Formation (Wuchiapingian) compared to that in the lower–middle Maokou Formation (Capitanian) were probably caused by the re-oxidization of 12 C-rich OM during regression. Global regression resulted in the negative shift of δ 13 C carb at the G–L boundary in South China and led to the loss of shallow-marine benthic habitat. Large-scale global regression is probably one of the main causes for this bio-crisis." @default.
- W2623250964 created "2017-06-15" @default.
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- W2623250964 creator A5049754926 @default.
- W2623250964 creator A5079242073 @default.
- W2623250964 date "2017-06-05" @default.
- W2623250964 modified "2023-10-18" @default.
- W2623250964 title "Carbon isotope perturbations and faunal changeovers during the Guadalupian mass extinction in the middle Yangtze Platform, South China" @default.
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- W2623250964 doi "https://doi.org/10.1017/s0016756817000462" @default.
- W2623250964 hasPublicationYear "2017" @default.
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