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Coeval 40Ar/39Ar Ages of 65.0 Million Years Ago from Chicxulub Crater Melt Rock and Cretaceous-Tertiary Boundary Tektites | | Carl C Swisher
; José M Grajales-Nishimura
; Alessandro Montanari
; Stanley V Margolis
; Philippe Claeys
; Walter Alvarez
; Paul Renne
; Esteban Cedillo-Pardoa
; Florentin J-M R Maurrasse
; Garniss H Curtis
; Jan Smit
; Michael O McWilliams
; | | Date: |
14 Aug 1992 | | Journal: | Science, 257 (5072), 954-958 | | 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. | | Source: | PubMed, pmid17789640 doi: 10.1126/science.257.5072.954 | | Services: | Forum | Review | Favorites | |
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