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Science 14 August 1992:
Vol. 257. no. 5072, pp. 954 - 958
DOI: 10.1126/science.257.5072.954
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Articles
Coeval 40Ar/39Ar Ages of 65.0 Million Years Ago from Chicxulub Crater Melt Rock and Cretaceous-Tertiary Boundary Tektites
Carl C. Swisher III 1,
José M. Grajales-Nishimura 2,
Alessandro Montanari 3,
Stanley V. Margolis 4,
Philippe Claeys 4,
Walter Alvarez 3,
Paul Renne 1,
Esteban Cedillo-Pardoa 2,
Florentin J-M. R. Maurrasse 5,
Garniss H. Curtis 1,
Jan Smit 6, and
Michael O. McWilliams 7
1 Geochronology Center, Institute of Human Origins, 2453 Ridge Road, Berkeley, CA 94709
2 Instutito Mexicano del Petróleo, Eje Central Lazaro Cardenas No. 152, 07730 México D. F., México
3 Department of Geology and Geophysics, University of California, Berkeley, CA 94720, and Osservatorio Geologico, Col di Gioco, Apiro (MC), Italy
4 Department of Geology, University of California, Davis, CA 95616
5 Department of Geology, Florida International University, Tamiami Trail and Southwest 107th Avenue, Miami, FL 33199
6 Department of Sedimentary Geology, Free University, de Boelelaan 1085, 1081 HV Amsterdam, Netherlands
7 Department of Geophysics, Stanford University, Stanford, CA 94305
40Ar/39Ar 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 40Ar/39Ar 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 40Ar/39Ar 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.
Submitted on June 10, 1992
Accepted on July 1, 1992
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