High temperature methane emissions from Large Igneous Provinces as contributors to late Permian mass extinctions.
High temperature methane emissions from Large Igneous Provinces as contributors to late Permian mass extinctions.
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来自大火成岩省份的高温甲烷排放是二叠纪巨大灭绝的贡献者。
DOI：
10.1038/s41467-022-34645-3
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发表时间：
2022-11-12
影响因子：
16.6
通讯作者：
Zhou Z
中科院分区：
文献类型：
--
作者：
Chen C;Qin S;Wang Y;Holland G;Wynn P;Zhong W;Zhou Z
大火成岩省引起的甲烷（CH 4）排放有可能导致全球环境变化，引发地球历史上的大规模灭绝。在这里，我们探讨了来自四川盆地中部，这是在峨眉山大火成岩省（ELIP）的天然气样品中的甲烷的来源。我们报告的证据表明，甲烷的形成温度很高（在249−17/+19和256−20/+22 °C之间），这些证据来自甲烷的聚集测量和稀有气体的地幔来源特征，这证实了石油裂解的CH 4和焦沥青是储层中的副产品，与热液活动和ELIP的增强加热有关。我们估计了ELIP引起的石油裂解CH 4的体积，并认为CH 4的排放量足以在二叠纪结束之前引发全球变暖。我们还建议，类似的排放量与西伯利亚圈闭大火成岩省石油裂解CH 4也可能导致二叠纪末大规模灭绝显着。保存在天然气储层中的同位素特征表明，一个大火成岩省从石油中产生并释放了大量甲烷，导致全球变暖，从而导致二叠纪末灭绝。
Methane (CH4) emissions induced by Large Igneous Provinces have the potential to contribute to global environmental changes that triggered mass extinctions in Earth’s history. Here, we explore the source of methane in gas samples from central Sichuan Basin, which is within the Emeishan Large Igneous Province (ELIP). We report evidence of high methane formation temperatures (between 249−17/+19 and 256−20/+22 °C) from clumped methane measurements and mantle-derived signatures of noble gases, which verify that oil-cracked CH4 and pyrobitumen are by-products within the reservoirs, associated with hydrothermal activity and enhanced heating by the ELIP. We estimate the volume of oil-cracked CH4 induced by the ELIP and argue that CH4 emissions would have been sufficient to initiate global warming prior to the end of the Permian. We also suggest that similar emissions from oil-cracked CH4 associated with the Siberian Traps Large Igneous Province may also have contributed to the end-Permian mass extinction significantly. Isotope signatures preserved within a natural gas reservoir reveal large quantities of methane were generated and released from oil by a Large Igneous Province, resulting in the initiation of global warming, which led to the End-Permian Extinction.
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