doi: 10.1126/science.aac7549.
State shift in Deccan volcanism at the Cretaceous-Paleogene boundary, possibly induced by impact
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- DOI: 10.1126/science.aac7549
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State shift in Deccan volcanism at the Cretaceous-Paleogene boundary, possibly induced by impact
Paul R Renne et al. Science..
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Abstract
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.
Copyright © 2015, American Association for the Advancement of Science.
Comment in
- Earth science: Deadly combination.Duncan R.Duncan R.Nature. 2015 Nov 12;527(7577):172-3. doi: 10.1038/527172a.Nature. 2015.PMID:26560294No abstract available.
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