Chicxulub crater: a possible Cretaceous/Tertiary boundary impact crater on the Yucatan Peninsula, Mexico

A. R. Hildebrand, Glen T. Penfield, David A. Kring, M. Pilkington, Camargo Z. Antonio, William V. Boynton

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Abstract

We suggest that a buried 180km-diameter circular structure on the Yucatan Peninsula, Mexico, is an impact crater. Its size and shape are revealed by magnetic and gravity-field anomalies, as well as by oil wells drilled inside and near the structure. The stratigraphy of the crater includes a sequence of andesitic igneous rocks and glass interbedded with, and overlain by, breccias that contain evidence of shock metamorphism. The andesitic rocks have chemical and isotopic compositions similar to those of tektites found in Cretaceous/Tertiary (K/T) ejects. A 90m-thick K/T boundary breccia, also containing evidence of shock metamorphism, is present 50km outside the crater's edge. -from Authors

Original languageEnglish (US)
Pages (from-to)867-871
Number of pages5
JournalGeology
Volume19
Issue number9
DOIs
StatePublished - Jan 1 1991

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ASJC Scopus subject areas

  • Geology

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