Evidence for ocean water invasion into the Chicxulub crater at the Cretaceous/Tertiary boundary

Kazuhisa Goto, Ryuji Tada, Eiichi Tajika, Timothy J. Bralower, Takashi Hasegawa, Takafumi Matsui

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

The possibility of ocean water invasion into the Chicxulub crater following the impact at the Cretaceous/Tertiary boundary was investigated based on examination of an impactite between approximately 794.63 and 894.94 m in the Yaxcopoil-1 (Yax-1) core. The presence of cross lamination in the uppermost part of the impactite suggests the influence òf an oçean current at least during the sedimentation of this interval. Abundant occurrence of nannofossils of late Campanian to early Maastrichtian age in the matrices of samples from the upper part of the impactite suggests that the carbonate sediments deposited on the inner rim margin and outside the crater were eroded and transported into the crater most likely by ocean water that invaded the crater after its formation. The maximum grain size of limestone lithics and vesicular melt fragments, and grain and bulk chemical compositions show a cyclic variation in the upper part of the impactite. The upward fining grain size and the absence of erosional contact at the base of each cycle suggest that the sediments were derived from resuspension of units elsewhere in the crater, most likely by high energy currents association with ocean water invasion.

Original languageEnglish (US)
Pages (from-to)1233-1247
Number of pages15
JournalMeteoritics and Planetary Science
Volume39
Issue number7
DOIs
StatePublished - Jul 2004

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Space and Planetary Science

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