Newly identified “Tunnunik” impact structure, Prince Albert Peninsula, northwestern Victoria Island, Arctic Canada
Abstract Regional geological mapping of the glaciated surface of northwestern Victoria Island in the western Canadian Arctic revealed an anomalous structure in otherwise flat‐lying Neoproterozoic and lower Paleozoic carbonate rocks, located south of Richard Collinson Inlet. The feature is roughly ci...
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crwiley:10.1111/maps.12052 2024-09-15T18:31:33+00:00 Newly identified “Tunnunik” impact structure, Prince Albert Peninsula, northwestern Victoria Island, Arctic Canada DEWING, Keith PRATT, Brian R. HADLARI, Thomas BRENT, Tom BÉDARD, Jean RAINBIRD, Robert H. Geo-mapping for Energy and Minerals Program of the Geological Survey of Canada 2013 http://dx.doi.org/10.1111/maps.12052 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.12052 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.12052 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 48, issue 2, page 211-223 ISSN 1086-9379 1945-5100 journal-article 2013 crwiley https://doi.org/10.1111/maps.12052 2024-08-01T04:23:31Z Abstract Regional geological mapping of the glaciated surface of northwestern Victoria Island in the western Canadian Arctic revealed an anomalous structure in otherwise flat‐lying Neoproterozoic and lower Paleozoic carbonate rocks, located south of Richard Collinson Inlet. The feature is roughly circular in plan view, approximately 25 km in diameter, and characterized by quaquaversal dips of approximately 45°, decreasing laterally. The core of the feature also exhibits local vertical dips, low‐angle reverse faults, and drag folds. Although brecciation was not observed, shatter cones are pervasive in all lithologies in the central area, including 723 Ma old dikes that penetrate Neoproterozoic limestones. Their abundance decreases distally, and none was observed in surrounding, horizontally bedded strata. This circular structure is interpreted as a deeply eroded meteorite impact crater of the complex type, and the dipping strata as the remnants of the central uplift. The variation in orientation and shape of shatter cones point to variably oriented stresses with the passage of the shock wave, possibly related to the presence of pore water in the target strata as well as rock type and lithological heterogeneities, especially bed thickness. Timing of impact is poorly constrained. The youngest rocks affected are Late Ordovician (approximately 450 Ma) and the impact structure is mantled by undisturbed postglacial sediments. Regional, hydrothermal dolomitization of the Ordovician limestones, possibly in the Late Devonian (approximately 360 Ma), took place before the impact, and widespread WSW – ENE ‐trending normal faults of probable Early Cretaceous age (approximately 130 Ma) apparently cross‐cut the impact structure. Article in Journal/Newspaper Prince Albert Peninsula Richard Collinson Inlet Victoria Island victoria island Wiley Online Library Meteoritics & Planetary Science 48 2 211 223 |
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Wiley Online Library |
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English |
description |
Abstract Regional geological mapping of the glaciated surface of northwestern Victoria Island in the western Canadian Arctic revealed an anomalous structure in otherwise flat‐lying Neoproterozoic and lower Paleozoic carbonate rocks, located south of Richard Collinson Inlet. The feature is roughly circular in plan view, approximately 25 km in diameter, and characterized by quaquaversal dips of approximately 45°, decreasing laterally. The core of the feature also exhibits local vertical dips, low‐angle reverse faults, and drag folds. Although brecciation was not observed, shatter cones are pervasive in all lithologies in the central area, including 723 Ma old dikes that penetrate Neoproterozoic limestones. Their abundance decreases distally, and none was observed in surrounding, horizontally bedded strata. This circular structure is interpreted as a deeply eroded meteorite impact crater of the complex type, and the dipping strata as the remnants of the central uplift. The variation in orientation and shape of shatter cones point to variably oriented stresses with the passage of the shock wave, possibly related to the presence of pore water in the target strata as well as rock type and lithological heterogeneities, especially bed thickness. Timing of impact is poorly constrained. The youngest rocks affected are Late Ordovician (approximately 450 Ma) and the impact structure is mantled by undisturbed postglacial sediments. Regional, hydrothermal dolomitization of the Ordovician limestones, possibly in the Late Devonian (approximately 360 Ma), took place before the impact, and widespread WSW – ENE ‐trending normal faults of probable Early Cretaceous age (approximately 130 Ma) apparently cross‐cut the impact structure. |
author2 |
Geo-mapping for Energy and Minerals Program of the Geological Survey of Canada |
format |
Article in Journal/Newspaper |
author |
DEWING, Keith PRATT, Brian R. HADLARI, Thomas BRENT, Tom BÉDARD, Jean RAINBIRD, Robert H. |
spellingShingle |
DEWING, Keith PRATT, Brian R. HADLARI, Thomas BRENT, Tom BÉDARD, Jean RAINBIRD, Robert H. Newly identified “Tunnunik” impact structure, Prince Albert Peninsula, northwestern Victoria Island, Arctic Canada |
author_facet |
DEWING, Keith PRATT, Brian R. HADLARI, Thomas BRENT, Tom BÉDARD, Jean RAINBIRD, Robert H. |
author_sort |
DEWING, Keith |
title |
Newly identified “Tunnunik” impact structure, Prince Albert Peninsula, northwestern Victoria Island, Arctic Canada |
title_short |
Newly identified “Tunnunik” impact structure, Prince Albert Peninsula, northwestern Victoria Island, Arctic Canada |
title_full |
Newly identified “Tunnunik” impact structure, Prince Albert Peninsula, northwestern Victoria Island, Arctic Canada |
title_fullStr |
Newly identified “Tunnunik” impact structure, Prince Albert Peninsula, northwestern Victoria Island, Arctic Canada |
title_full_unstemmed |
Newly identified “Tunnunik” impact structure, Prince Albert Peninsula, northwestern Victoria Island, Arctic Canada |
title_sort |
newly identified “tunnunik” impact structure, prince albert peninsula, northwestern victoria island, arctic canada |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1111/maps.12052 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.12052 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.12052 |
genre |
Prince Albert Peninsula Richard Collinson Inlet Victoria Island victoria island |
genre_facet |
Prince Albert Peninsula Richard Collinson Inlet Victoria Island victoria island |
op_source |
Meteoritics & Planetary Science volume 48, issue 2, page 211-223 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/maps.12052 |
container_title |
Meteoritics & Planetary Science |
container_volume |
48 |
container_issue |
2 |
container_start_page |
211 |
op_container_end_page |
223 |
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1810473256347500544 |