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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >A temporal link between the Emeishan large igneous province (SW China) and the end-Guadalupian mass extinction
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A temporal link between the Emeishan large igneous province (SW China) and the end-Guadalupian mass extinction

机译：峨眉山大火成岩省（中国西南部）与瓜达鲁普末灭绝之间的时间联系

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Previous studies have suggested that there were two mass extinction events in the Late Permian: one that occurred at the Permo-Triassic (P/T) boundary (251 Ma) and a second, smaller mass extinction that occurred 5-8 Myr earlier at the end of the Guadalupian. Many workers have argued that there is a causal relationship between large-scale volcanic activity and mass extinctions. The major mass extinction event at the P/T boundary coincides with the outpouring of huge quantities of lava that formed the Siberian flood basalt province in Russia. Courtillot et al. [Earth Planet. Sci. Lett. 166 (1999) 177-195] and Wignall [Earth Sci. Rev. 53 (2001) 1-33] suggested that the earlier Late Permian mass extinction coincided with the eruption of the lavas that formed the Emeishan flood basalt (EFB) province in SW China. However, the age of eruption of the EFB lavas is poorly constrained. Using the Sensitive High-Resolution Ion Microprobe to analyze zircons, we have established the age of the Xinjie intrusion, believed to be a feeder to the main phase of EFB volcanism, to be 259 ± 3 Ma. Hence, the formation of the EFB is coincident with a proposed extinction event at 256-259 Ma. This result supports a temporal link between the Emeishan large igneous province and the end-Guadalupian mass extinction.
机译：先前的研究表明，晚二叠纪发生了两次灭绝事件：一次发生在二叠纪-三叠纪（P / T）边界（251 Ma），另一次是较小的灭绝事件，发生于5-8 Myr。瓜达鲁皮安的尽头。许多工人争辩说，大规模的火山活动与大灭绝之间存在因果关系。在P / T边界发生的大规模生物灭绝事件与大量熔岩的涌出同时形成了俄罗斯的西伯利亚洪水玄武岩省。 Courtillot等。 [地球。科学来吧166（1999）177-195]和Wignall [地球科学。 Rev. 53（2001）1-33]提出，早二叠世的大灭绝与形成中国西南部峨眉山洪水玄武岩（EFB）省的熔岩的喷发同时发生。但是，EFB熔岩的喷发年龄受到了严格限制。使用灵敏的高分辨率离子探针分析锆石，我们确定了信捷侵入体的年龄为259±3 Ma，据信这是EFB火山作用的主要阶段。因此，EFB的形成与256-259 Ma的灭绝事件相吻合。这一结果支持了峨眉山大火成岩省和瓜达鲁普末灭绝之间的时间联系。

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