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| COEVAL AR-40/AR-39 AGES OF 65.0 MILLION YEARS AGO FROM CHICXULUB CRATER MELT ROCK AND CRETACEOUS-TERTIARY BOUNDARY TEKTITES |
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| Author(s): SWISHER CC, GRAJALESNISHIMURA JM, MONTANARI A, MARGOLIS SV, CLAEYS P, ALVAREZ W, RENNE P, CEDILLOPARDO E, MAURRASSE FJMR, CURTIS GH, SMIT J, MCWILLIAMS MO |
| Source: SCIENCE Volume: 257 Issue: 5072 Pages: 954-958 Published: AUG 14 1992 |
| Times Cited: 208 References: 41 |
| Abstract: Ar-40/Ar-39 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 Yucatan, 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 Ar-40/Ar-39 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 +/- 0.1 0 Ma (mean total fusion age for both sites). The Ar-40/Ar-39 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. |
| Document Type: Article |
| Language: English |
| Reprint Address: SWISHER, CC (reprint author), INST HUMAN ORIGINS, CTR GEOCHRONOL, 2453 RIDGE RD, BERKELEY, CA 94709 USA |
Addresses:
1. OSSERV GEOL, APIRO, ITALY
2. INST MEXICANO PETR, MEXICO CITY 07730, DF MEXICO
3. UNIV CALIF BERKELEY, DEPT GEOL & GEOPHYS, BERKELEY, CA 94720 USA
4. UNIV CALIF DAVIS, DEPT GEOL, DAVIS, CA 95616 USA
5. FLORIDA INT UNIV, DEPT GEOL, MIAMI, FL 33199 USA
6. FREE UNIV AMSTERDAM, DEPT SEDIMENTARY GEOL, 1081 HV AMSTERDAM, NETHERLANDS
7. STANFORD UNIV, DEPT GEOPHYS, STANFORD, CA 94305 USA |
| Publisher: AMER ASSOC ADVANCEMENT SCIENCE, 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 |
| Subject Category: Multidisciplinary Sciences |
| IDS Number: JH827 |
| ISSN: 0036-8075 |
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