| Titre | Fission-track dating of Haughton Astrobleme and included biota, Devon Island, Canada |
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| Auteur | Omar, G; Johnson, K R; Hickey, L J; Robertson, P B; Dawson, M R; Barnosky, C W |
| Source | Science vol. 237, 1987 p. 1603-1605, https://doi.org/10.1126/science.237.4822.1603 |
| Année | 1987 |
| Séries alt. | Commission géologique du Canada, Contributions aux publications extérieures 15287 |
| Éditeur | American Association for the Advancement of Science (AAAS) |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1126/science.237.4822.1603 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Territoires du Nord-Ouest |
| Région | Devon Island |
| Sujets | astroblèmes; métamorphisme, choc; Miocène; traces de fission; apatite; datations par traces de fission; géologie extraterrestre; Tertiaire |
| Diffusé | 1987 09 25 |
| Résumé | (disponible en anglais seulement)
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 ± 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. |
| GEOSCAN ID | 121250 |
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