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K-Pg asteroid impact set off pulse of Deccan volcanism in 1-2 punch



Ben Creisler
bcreisler@gmail.com


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
DOI: 10.1126/science.aac7549
http://www.sciencemag.org/content/350/6256/76.abstract

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.


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News

http://news.berkeley.edu/2015/10/01/asteroid-impact-volcanism-were-one-two-punch-for-dinosaurs/

http://phys.org/news/2015-10-asteroid-impact-volcanism-one-two-dinosaurs.html

https://www.newscientist.com/article/dn28275-volcanoes-plus-asteroid-might-have-finished-off-dinosaurs/

http://www.sfgate.com/science/article/Scientists-refine-the-timing-of-events-that-6541725.php

http://www.theguardian.com/science/2015/oct/01/asteroid-that-killed-dinosaurs-also-intensified-volcanic-eruptions-study

http://www.latimes.com/science/sciencenow/la-sci-sn-volcanoes-asteroid-mass-extinction-20151001-story.html
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