Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..161b&link_type=abstract
In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 161-162 (SEE N94-12015 01-91)
Physics
Argon Isotopes, Cretaceous-Tertiary Boundary, Geochronology, Meteorite Craters, Breccia, Glass, Meteorite Collisions, Mineralogy, Rocks, Siberia
Scientific paper
The Popigai impact structure of central Siberia is the largest known impact crater in the Commonwealth of Independent States with an original diameter of some 100 km. The age of the crater is constrained by the existing stratigraphy to a period between 5-65 Ma. Attempts to date the impact event using conventional K-Ar on whole rock samples and fission track dating on glasses yield a spread of ages between 30 and 45 Ma. Argon step-heating analyses of several whole-rock samples performed with the Argon Laserprobe at the University of Toronto indicated an age of impact of about 36 Ma. However, a more recently reported Ar-40 - Ar-49 result on glass separated from a suevite sample gave a 65 Ma age and raised the possibility that Popigai was involved with the K/T boundary event. We have pursued further analyses at the University of Toronto on a broader spectrum of Popigai samples. These results confirm an age of about 36 Ma for the formation of this crater, and indicate that Popigai was not associated with the K/T boundary event.
Bottomley Richard J.
Grieve Richard A. F.
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