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K-Pg asteroid impact set off pulse of Deccan volcanism in 1-2 punch
A new paper:
Paul R. Renne, Courtney J. Sprain, Mark A. Richards, Stephen Self,
Loÿc Vanderkluysen, and Kanchan Pande (2015)
State shift in Deccan volcanism at the Cretaceous-Paleogene boundary,
possibly induced by impact.
Science 350 (6256): 76-78
Bolide impact and flood volcanism compete as leading candidates for
the cause of terminal-Cretaceous mass extinctions. High-precision
40Ar/39Ar 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.