Two large meteorite impacts at the Cretaceous-Paleogene boundary
Two large meteorite impacts at the Cretaceous-Paleogene boundary
复制标题
白垩纪-古近纪边界的两次大型陨石撞击
作者:
Jolley D
The end-Cretaceous mass extinction has been attributed by most to a single asteroid impact at Chicxulub on the Yucatán Peninsula, Mexico. The discovery of a second smaller crater with a similar age at Boltysh in the Ukraine has raised the possibility that a shower of asteroids or comets impacted Earth close to the Cretaceous-Paleogene (K-Pg) boundary. Here we present palynological and δ13C evidence from crater-fill sediments in the Boltysh impact crater. Our analyses demonstrate that a post-impact flora, formed on the ejecta layer, was in turn devastated by the K-Pg event. The sequence of floral recovery from the K-Pg event is directly comparable with that in middle North America. We conclude that the Boltysh crater predated Chicxulub by ∼2–5 k.y., a time scale that constrains the likely origin of the bodies that formed the two known K-Pg craters.
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影响因子:
56.9
作者:
ALVAREZ, LW;ALVAREZ, W;MICHEL, HV
通讯作者:
MICHEL, HV
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
G. Keller;T. Adatte;W. Stinnesbeck;D. Stüben;Z. Berner;U. Kramar;Markus Harting
通讯作者:
Markus Harting
影响因子:
56.9
作者:
W. Álvarez;F. Asaro;A. Montanari
通讯作者:
A. Montanari
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
J. Fritz;R. Tagle;N. Artemieva
通讯作者:
N. Artemieva
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
A. Schimmelmann;M. J. Deniro
通讯作者:
M. J. Deniro