Rapid short-term cooling following the Chicxulub impact at the Cretaceous-Paleogene boundary

被引:137
|
作者
Vellekoop, Johan [1 ]
Sluijs, Appy [1 ]
Smit, Jan [2 ]
Schouten, Stefan [3 ,4 ]
Weijers, Johan W. H. [3 ]
Damste, Jaap S. Sinninghe [3 ,4 ]
Brinkhuis, Henk [1 ]
机构
[1] Univ Utrecht, Fac Geosci, Dept Earth Sci, Lab Palaeobot & Palynol, NL-3584 CD Utrecht, Netherlands
[2] Vrije Univ Amsterdam, Fac Earth & Life Sci, NL-1081 HV Amsterdam, Netherlands
[3] Univ Utrecht, Fac Geosci, Dept Earth Sci, NL-3584 CD Utrecht, Netherlands
[4] NIOZ Royal Netherlands Inst Sea Res, Dept Marine Organ Biogeochem, NL-1790 AB Den Burg, Texel, Netherlands
基金
欧洲研究理事会;
关键词
K-Pg boundary; bolide impact; Climate change; organic paleothermometry; SURFACE TEMPERATURE RECONSTRUCTIONS; TETRAETHER MEMBRANE-LIPIDS; K-P BOUNDARY; TERTIARY BOUNDARY; ASTEROID IMPACT; EXTINCTION; TEXAS; EVENTS; RECOVERY; SEQUENCE;
D O I
10.1073/pnas.1319253111
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
07 ; 0710 ; 09 ;
摘要
The mass extinction at the Cretaceous-Paleogene boundary, similar to 66 Ma, is thought to be caused by the impact of an asteroid at Chicxulub, present-day Mexico. Although the precise mechanisms that led to this mass extinction remain enigmatic, most postulated scenarios involve a short-lived global cooling, a so-called "impact winter" phase. Here we document a major decline in sea surface temperature during the first months to decades following the impact event, using TEX86 paleothermometry of sediments from the Brazos River section, Texas. We interpret this cold spell to reflect, to our knowledge, the first direct evidence for the effects of the formation of dust and aerosols by the impact and their injection in the stratosphere, blocking incoming solar radiation. This impact winter was likely a major driver of mass extinction because of the resulting global decimation of marine and continental photosynthesis.
引用
收藏
页码:7537 / 7541
页数:5
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