On impact and volcanism across the Cretaceous-Paleogene boundary
On impact and volcanism across the Cretaceous-Paleogene boundary
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DOI：
10.1126/science.aay5055
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发表时间：
2020-01-17
期刊：
影响因子：
56.9
通讯作者：
Zachos, James C.
中科院分区：
文献类型：
--
作者：
Hull, Pincelli M.;Bomemann, Andre;Zachos, James C.
由于边界附近发生了非常大的火山岩撞击和溢流玄武岩火山作用，白垩纪末期大规模灭绝的原因受到了激烈的争论。由于关于杀死机制和火山成因放气、影响和灭绝的相对时间的不确定性，弄清它们的相对重要性是复杂的。我们使用碳循环模型和古温度记录来限制火山成因放气的时间。我们发现，主要的放气在撞击前明显开始和结束，只有撞击与大规模灭绝和生物放大的碳循环变化重合。我们的模型表明，这些与灭绝相关的碳循环变化将允许海洋吸收大量二氧化碳，从而限制了灭绝后火山活动原本预期的全球变暖。
The cause of the end-Cretaceous mass extinction is vigorously debated, owing to the occurrence of a very large bolide impact and flood basalt volcanism near the boundary. Disentangling their relative importance is complicated by uncertainty regarding kill mechanisms and the relative timing of volcanogenic outgassing, impact, and extinction We used carbon cycle modeling and paleotemperature records to constrain the timing of volcanogenic outgassing. We found support for major outgassing beginning and ending distinctly before the impact, with only the impact coinciding with mass extinction and biologically amplified carbon cycle change Our models show that these extinction-related carbon cycle changes would have allowed the ocean to absorb massive amounts of carbon dioxide, thus limiting the global warming otherwise expected from postextinction volcanism.