K/T boundary deposits in the Paleo-western Caribbean basin

Ryuji Tada, Manuel A. Iturralde-Vinent, Takafumi Matsui, Eiichi Tajika, Tatsuo Oji, Kazuhisa Goto, Yoichiro Nakano, Hideo Takayama, Shinji Yamamoto, Shoichi Kiyokawa, Kazuhiro Toyoda, Dora García-Delgado, Consuelo Díaz-Otero, Reinaldo Rojas-Consuegra

Research output: Contribution to journalReview articlepeer-review

6 Citations (Scopus)


A thick, calcareous, clastic megabed of late Maastrichtian age has been known for sometime in western and central Cuba. This megabed was formed in association with the bolide impact at Chicxulub, Yucatan, at the K/T boundary, and is composed of a lower gravity-flow unit and an upper homogenite unit. The lower gravity-flow unit is dominantly composed of calcirudite that was formed because of collapses of the Yucatan, Cuban, and Bahamian platform margins and subsequent accumulation in the lower slope to basin margin environment. The gravity flow probably was triggered by a seismic wave induced by the impact, although a ballistic flow may have triggered collapse in the case of proximal sites (Yucatan margin). The upper homogenite unit is composed of massive and normally graded calcarenite to calcilutite that was formed as a result of large tsunamis associated with the impact and deposited in wider areas in the deeper part of Paleo-western Caribbean basin. Slight grain-size oscillations in this unit probably reflect the influence of repeated tsunamis. The large tsunamis were generated either by the movement of water into and out of the crater cavity or by the large-scale slope failure on the eastern margin of the Yucatan platform. In upper slope to shelf environments, gravity-flow deposits and homogenite are absent, and a thin sandstone complex influenced by repeating tsunami waves was deposited.

Original languageEnglish
Pages (from-to)105-108
Number of pages4
JournalAAPG Memoir
Issue number79
Publication statusPublished - Dec 1 2005

All Science Journal Classification (ASJC) codes

  • Economic Geology


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