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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 >Age of the Emeishan flood magmatism and relations to Permian-Triassic boundary events
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Age of the Emeishan flood magmatism and relations to Permian-Triassic boundary events

机译：峨眉山洪水岩浆时代与二叠纪-三叠纪边界事件的关系

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摘要

The Permian-Triassic (P-T) mass extinction, the greatest biological mortality event in the Earth's history, was probably caused by dramatic and global forcing mechanisms such as the Siberian flood volcanism. Here we present the first set of high-precision ~(40)Ar/~(39)Ar dating results of volcanic and intrusive rocks from the Emeishan Traps, South China, which define a main stage of the flood magmatism at ～251-253 Ma and a subordinate precursory activity at ～255 Ma. This time span is generally coeval with, or slightly older than, the age of the P-T boundary estimated by the ash beds in the Meishan stratotype section and the main eruption of the Siberian Traps. Our data reinforces the notion that the eruption of the Emeishan Traps, rather than eruption of the Siberian Traps, accounted for the formation of the P-T boundary ash beds in South China. The Emeishan flood magmatism, which occurred in the continental margin comprising thick marine limestone formations, moreover, may have triggered rapid release of large volumes of methane and carbon dioxide that could have been responsible for the global δ~(13)C excursion and associated environmental crisis leading to the mass extinction at the P-T boundary.
机译：二叠纪-三叠纪（P-T）大规模灭绝是地球历史上最大的生物死亡事件，可能是由诸如西伯利亚洪水火山爆发这样的戏剧性和全球性强迫机制造成的。在这里，我们介绍了第一组高精度的〜（40）Ar /〜（39）Ar测年结果，这些结果来自华南峨眉山圈闭的火山岩和侵入岩，定义了〜251-253年洪水岩浆作用的主要阶段。 Ma和从属活动在〜255 Ma。此时间跨度通常与眉山平流型剖面中的灰烬床和西伯利亚圈闭的主要喷发所估计的P-T边界年龄相同或稍早。我们的数据强化了这样一种观念，即峨眉山圈闭的喷发而不是西伯利亚圈闭的喷发是华南P-T边界灰床形成的原因。此外，发生在大陆边缘的峨眉山洪水岩浆活动包括厚厚的海洋石灰岩地层，可能触发了大量甲烷和二氧化碳的快速释放，这可能是造成全球δ〜（13）C偏移和相关环境的原因。危机导致PT边界大规模灭绝。

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