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TitleFission-track dating of Haughton Astrobleme and included biota, Devon Island, Canada
AuthorOmar, G; Johnson, K R; Hickey, L J; Robertson, P B; Dawson, M R; Barnosky, C W
SourceScience vol. 237, 1987 p. 1603-1605,
Alt SeriesGeological Survey of Canada, Contribution Series 15287
PublisherAmerican Association for the Advancement of Science (AAAS)
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories
AreaDevon Island
Subjectsextraterrestrial geology; impact structures; astroblemes; metamorphism, shock; miocene; fission tracks; apatite; fission-track dates; Haughton Astrobleme; Tertiary
AbstractHaughton 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 ± 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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