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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 >Early Wuchiapingian cooling linked to Emeishan basaltic weathering?
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Early Wuchiapingian cooling linked to Emeishan basaltic weathering?

机译：武家平的早期冷却与峨眉山玄武岩风化有关？

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摘要

The last glaciation during the late Paleozoic ice age commenced at around the Guadalupian-Lopingian (G-L) boundary and is synchronous with the emplacement of the Emeishan large igneous province. Using CA-TIMS zircon U-Pb dating, we obtained an age of 259.51 +/- 0.21 Ma for the uppermost tuff from the Puan volcanic sequence in the eastern Emeishan large igneous province, constraining the timing of Emeishan volcanism and providing another candidate age for the G-L boundary. In addition, we determined an age of 259.69 +/- 0.72 Ma for a basal claystone in the immediately overlying Longtan Formation from a drill core section in southwest South China. These ages, along with source weathering trends of mudstones from the lower Longtan Formation, and compiled paleotemperature records, indicate an earliest Wuchiapingian cooling coinciding with the onset of the last Permian glaciation. This global cooling is associated with positive shifts in both organic and carbonate carbon isotopic records and likely a decrease in atmospheric pCO(2). A hypothesised causal linkage is proposed in which the rapid post eruptive basaltic weathering of the Emeishan province in an equatorial humid belt may accelerate the atmospheric CO2 consumption and lead to climate cooling. Our work supports the long-term climate cooling effects of large igneous provinces. (C) 2018 Elsevier B.V. All rights reserved.
机译：古代古生代冰河期间的最后一次冰川在瓜达卢普 - 洛普滨（G-L）边界周围开始，并与峨眉山大火火省的施加同步。使用CA-TIMS ZIRCON U-PB约会，我们获得了从峨眉山东部的PUAN火山序列的最高凝乳的年龄为259.51 +/- 0.21 mA，限制了峨眉山火山的时机，为另一位候选人提供了GL边界。此外，我们在立即覆盖了南方华南地区的钻孔核心部分的立即覆盖的龙潭地层中，我们确定了259.69 +/- 0.72 mA的年龄。这些年龄段以及来自较低的龙天地层的Mudstones的源风化趋势，并编制了古色景记录，表明了最早的武器平台冷却与最后一次二叠纪冰川的发作恰逢。这种全局冷却与有机和碳酸碳同位素记录中的正偏移有关，并且可能降低大气PCO（2）。提出了一个假设的因果关系，其中赤道湿带中峨眉山省的快速爆发玄武岩风化可以加速大气的二氧化碳消耗并导致气候冷却。我们的作品支持大火火病省份的长期气候冷却效果。 （c）2018年elestvier b.v.保留所有权利。

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