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GEOREF RECORD

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

Alan R. Hildebrand, Glen T. Penfield, David A. Kring, Mark Pilkington, Antonio Camargo Zanoguera, Stein B. Jacobsen and William V. Boynton
Chicxulub Crater; a possible Cretaceous/Tertiary boundary impact crater on the Yucatan Peninsula, Mexico
Geology (Boulder) (September 1991) 19 (9): 867-871

Abstract

We suggest that a buried 180-km-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) ejecta. A 90-m-thick K/T boundary breccia, also containing evidence of shock metamorphism, is present 50 km outside the crater's edge. This breccia probably represents the crater's ejecta blanket. The age of the crater is not precisely known, but a K/T boundary age is indicated. Because the crater is in a thick carbonate sequence, shock-produced CO (sub 2) from the impact may have caused a severe greenhouse warming.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 19
Serial Issue: 9
Title: Chicxulub Crater; a possible Cretaceous/Tertiary boundary impact crater on the Yucatan Peninsula, Mexico
Affiliation: Univ. Ariz., Dep. Planet. Sci., Tucson, AZ, United States
Pages: 867-871
Published: 199109
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 31
Accession Number: 1991-040897
Categories: Igneous and metamorphic petrologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, strat. cols., sketch maps
N21°00'00" - N21°15'00", W90°00'00" - W89°00'00"
Secondary Affiliation: Carson Serv., Perkasie, PA, USA, United StatesGeol. Surv. Can., CAN, CanadaPet. Mex., MEX, MexicoHarvard Univ., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1991
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