The potassium-argon age of the Kara craters and their relation to the Cretaceous-Paleogene impact event

Details The potassium-argon age of the Kara craters and their relation to the Cretaceous-Paleogene impact event The potassium-argon age of the Kara craters and their relation to the Cretaceous-Paleogene impact event

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990geokh......495k&link_type=abstract

Geokhimiia (ISSN 0016-7525), April 1990, p. 495-505. In Russian.

Mathematics

Logic

Argon Isotopes, Cretaceous Period, Meteorite Craters, Potassium, Radioactive Age Determination, Impact Damage, Mesozoic Era

Scientific paper

Results are presented of the potassium-argon dating of glass and rock samples from the Kara and the Us't'-Kara craters (believed to be connected with the catastrophic collision of the earth with a gigantic meteorite, believed by some to have caused a major biological catastrophe in the late Mesozoic period), showing that the ages obtained depend upon the structure of samples and, thus, can be inaccurate. No difference was found for the times of origin estimated for the Kara and the Us't'-Kara craters. Their isochrone age is about 66.1 + or - 0.8 years, corresponding to the present estimates of the boundary between the Cretaceous and Paleogene periods.

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