Fission-track dating of Haughton Astrobleme and included biota, Devon Island, Canada

Details Fission-track dating of Haughton Astrobleme and included biota, Devon Island, Canada Fission-track dating of Haughton Astrobleme and included biota, Devon Island, Canada

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sci...237.1603o&link_type=abstract

Science (ISSN 0036-8075), vol. 237, Sept. 25, 1987, p. 1603-1605. Research supported by the National Geographic Society and Depa

Mathematics

Logic

19

Chronology, Impact Damage, Meteorite Craters, Mineralogy, Breccia, Northwest Territories, Nuclear Fission, Particle Tracks

Scientific paper

Haughton Astrobleme is a major extraterrestrial impact structure located on Devon Island in the Canadian Arctic Archipelago, Northwest Territories. Apatite grains separated from shocked Precambrian gneiss contained in a polymict breccia from the center of the astrobleme yielded a fission-track date of 22.4 million + or - 1.4 million years before the present or early Miocene (Aquitanian). This provides a date for the impact event and an upper limit on the age of crater-filling lake sediments and a flora and vertebrate fauna occurring in them. A geologically precise date for these fossils provides an important biostratigraphic reference point for interpreting the biotic evolution of the Arctic.

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