| Title | Fission-track dating of Haughton Astrobleme and included biota, Devon Island, Canada |
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| Author | 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 |
| Year | 1987 |
| Alt Series | Geological Survey of Canada, Contribution Series 15287 |
| Publisher | American Association for the Advancement of Science (AAAS) |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Northwest Territories |
| Area | Devon Island |
| Subjects | extraterrestrial geology; impact structures; astroblemes; metamorphism, shock; miocene; fission tracks; apatite; fission-track dates; Haughton Astrobleme; Tertiary |
| Abstract | 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.
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| GEOSCAN ID | 121250 |
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