The Nadir Crater offshore West Africa: A candidate Cretaceous-Paleogene impact structure

Uisdean Nicholson, Veronica J. Bray, Sean P. S. Gulick, Benedict Aduomahor

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Abstract

Evidence of marine target impacts, binary impact craters, or impact clusters are rare on Earth. Seismic reflection data from the Guinea Plateau, West Africa, reveal a ≥8.5-km-wide structure buried below ~300 to 400 m of Paleogene sediment with characteristics consistent with a complex impact crater. These include an elevated rim above a terraced crater floor, a pronounced central uplift, and extensive subsurface deformation. Numerical simulations of crater formation indicate a marine target (~800-m water depth) impact of a ≥400-m asteroid, resulting in a train of large tsunami waves and the potential release of substantial quantities of greenhouse gases from shallow buried black shale deposits. Our stratigraphic framework suggests that the crater formed at or near the Cretaceous-Paleogene boundary (~66 million years ago), approximately the same age as the Chicxulub impact crater. We hypothesize that this formed as part of a closely timed impact cluster or by breakup of a common parent asteroid.
Original languageEnglish
Article numbereabn3096
JournalScience Advances
Volume8
Issue number33
DOIs
Publication statusPublished - 17 Aug 2022

ASJC Scopus subject areas

  • General

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