Ar-40-Ar-39 dating of the Haughton impact structure

Details Ar-40-Ar-39 dating of the Haughton impact structure Ar-40-Ar-39 dating of the Haughton impact structure

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988metic..23..233j&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 23, Sept. 1988, p. 233, 234.

Biology

30

Argon Isotopes, Hypervelocity Impact, Meteorite Craters, Meteoritic Damage, Radioactive Age Determination, Canada, Extinction, Geochronology, Gneiss, Paleobiology

Scientific paper

This paper presents the results on Ar-40/Ar-39 dating of a very strongly shocked banded biotite gneiss collected from the Haughton impact structure near the center of the central crater basin (Anomaly Hill). The results of the Ar-40/Ar-36 vs Ar-39/Ar-36 plot indicate an excess of Ar-40 in the melt samples of the gneiss. The age of the shocked gneiss, and hence of the impact structure, was estimated as 23.4 + or - 1.0 Ma.

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