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

被引：275

作者：

Renne, Paul R. ^{[1
,2
]}

Sprain, Courtney J. ^{[1
,2
]}

Richards, Mark A. ^{[2
]}

Self, Stephen ^{[2
]}

Vanderkluysen, Loc ^{[3
]}

Pande, Kanchan ^{[4
]}

机构：

[1] Berkeley Geochronol Ctr, Berkeley, CA 94709 USA

[2] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA

[3] Drexel Univ, Dept Biodivers Earth & Environm Sci, Philadelphia, PA 19104 USA

[4] Indian Inst Technol, Dept Earth Sci, Bombay 400076, Maharashtra, India

来源：

SCIENCE | 2015年 / 350卷 / 6256期

关键词：

TIME SCALES; TRAP LAVAS; PROVINCE; FLOWS; GEOCHRONOLOGY; GEOCHEMISTRY; ERUPTIONS; RECOVERY; DURATION; BASALTS;

D O I：

10.1126/science.aac7549

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

070301 [无机化学]; 070403 [天体物理学]; 070507 [自然资源与国土空间规划学]; 090105 [作物生产系统与生态工程];

摘要：

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 similar to 70% of the Traps' total volume was extruded in more massive and more episodic eruptions. Initiation of this new regime occurred within similar to 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.

引用

页码：76 / 78

页数：3

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