Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA. Department of Earth and Planetary Science, University of California-Berkeley, Berkeley, CA 94720, USA.
Department of Earth and Planetary Science, University of California-Berkeley, Berkeley, CA 94720, USA.
Science. 2015 Oct 2;350(6256):76-8. doi: 10.1126/science.aac7549.
Bolide impact and flood volcanism compete as leading candidates for the cause of terminal-Cretaceous mass extinctions. High-precision (40)Ar/(39)Ar data indicate that these two mechanisms may be genetically related, and neither can be considered in isolation. The existing Deccan Traps magmatic system underwent a state shift approximately coincident with the Chicxulub impact and the terminal-Cretaceous mass extinctions, after which ~70% of the Traps' total volume was extruded in more massive and more episodic eruptions. Initiation of this new regime occurred within ~50,000 years of the impact, which is consistent with transient effects of impact-induced seismic energy. Postextinction recovery of marine ecosystems was probably suppressed until after the accelerated volcanism waned.
火球撞击和洪水火山作用竞争作为导致白垩纪末期大规模灭绝的主要候选因素。高精度 (40)Ar/(39)Ar 数据表明，这两种机制可能具有遗传关系，因此不能孤立地考虑任何一种。现有的德干岩套岩浆系统在与希克苏鲁伯撞击和白垩纪末期大灭绝同时发生了状态转变，之后，约 70%的岩套总体积以更大量和更频繁的喷发形式喷出。这一新阶段的开始发生在撞击后约 5 万年，与撞击引起的地震能量的瞬态效应一致。海洋生态系统的灭绝后恢复可能一直受到抑制，直到加速的火山活动减弱之后。
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