State shift in Deccan volcanism at the Cretaceous-Paleogene boundary, possibly induced by impact | Zendy

Paul R. Renne | Zendy; Courtney J. Sprain | Zendy; Mark A. Richards | Zendy; Stephen Self | Zendy; L. Vanderkluysen | Zendy; Kanchan Pande | Zendy

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State shift in Deccan volcanism at the Cretaceous-Paleogene boundary, possibly induced by impact

Author(s) -

Paul R. Renne,

Courtney J. Sprain,

Mark A. Richards,

Stephen Self,

L. Vanderkluysen,

Kanchan Pande

Publication year - 2015

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.aac7549

Subject(s) - volcanism , deccan traps , extinction event , cretaceous , geology , flood basalt , paleontology , paleogene , earth science , tectonics , biological dispersal , population , demography , sociology

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.

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