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Coeval 40 Ar/ 39 Ar Ages of 65.0 Million Years Ago from Chicxulub Crater Melt Rock and Cretaceous-Tertiary Boundary Tektites

Swisher, Carl C., Grajales-Nishimura, José M., Montanari, Alessandro, Margolis, Stanley V., Claeys, Philippe, Alvarez, Walter, Renne, Paul, Cedillo-Pardoa, Esteban, Maurrasse, Florentin J-M. R., Curtis, Garniss H., Smit, Jan, McWilliams, Michael O.·1992·Science
DOI 10.1126/science.257.5072.954
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Abstract

40 Ar/ 39 Ar dating of drill core samples of a glassy melt rock recovered from beneath a massive impact breccia contained within the 180-kilometer subsurface Chicxulub crater in Yucatán, Mexico, has yielded well-behaved incremental heating spectra with a mean plateau age of 64.98 ± 0.05 million years ago (Ma). The glassy melt rock of andesitic composition was obtained from core 9 (1390 to 1393 meters) in the Chicxulub 1 well. The age of the melt rock is virtually indistinguishable from 40 Ar/ 39 Ar ages obtained on tektite glass from Beloc, Haiti, and Arroyo el Mimbral, northeastern Mexico, of 65.01 ± 0.08 Ma (mean plateau age for Beloc) and 65.07 ± 0.10 Ma (mean total fusion age for both sites). The 40 Ar/ 39 Ar ages, in conjunction with geochemical and petrological similarities, strengthen the recent suggestion that the Chicxulub structure is the source for the Haitian and Mexican tektites and is a viable candidate for the Cretaceous-Tertiary boundary impact site.

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Research works printed but not linked: 37

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Metadata

Authors
Swisher, C. C., Grajales-Nishimura, J. M., Montanari, A., Margolis, S. V., Claeys, P., Alvarez, W., Renne, P., Cedillo-Pardoa, E., Maurrasse, F. J.-M. R., Curtis, G. H., Smit, J., & McWilliams, M. O.
Affiliations
  • Geochronology Center, Institute of Human Origins, 2453 Ridge Road, Berkeley, CA 94709
  • Instutito Mexicano del Petróleo, Eje Central Lazaro Cardenas No. 152, 07730 México D. F., México
  • Department of Geology and Geophysics, University of California, Berkeley, CA 94720, and Osservatorio Geologico, Col di Gioco, Apiro (MC), Italy
  • Department of Geology, University of California, Davis, CA 95616
  • Department of Geology, Florida International University, Tamiami Trail and Southwest 107th Avenue, Miami, FL 33199
  • Department of Sedimentary Geology, Free University, de Boelelaan 1085, 1081 HV Amsterdam, Netherlands
  • Department of Geophysics, Stanford University, Stanford, CA 94305
Venue
Science
Publisher
American Association for the Advancement of Science (AAAS)
Published
1992-08-14
Volume
257
Issue
5072
Pages
954-958
ISSN
  • 0036-8075
  • 1095-9203
DOI
10.1126/science.257.5072.954
Cited by
281
References
0
Language
en

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