Geophysical signature of the Tunnunik impact structure, Northwest Territories, Canada
International audience In 2011, the discovery of shatter cones confirmed the 28 km-diameter Tunnunik complex impact structure, Northwest Territories, Canada. This study presents the first results of ground-based electromagnetic, gravimetric and magnetic surveys over this impact structure. Its centra...
Published in: | Meteoritics & Planetary Science |
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Main Authors: | , , , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Online Access: | https://insu.hal.science/insu-02484453 https://insu.hal.science/insu-02484453v2/document https://insu.hal.science/insu-02484453v2/file/Quesnel_et_al_Tunnunik_MAPS_withFigures_accepted.pdf https://doi.org/10.1111/maps.13447 |
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[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
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[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Quesnel, Yoann Zylberman, W. Rochette, P. Uehara, Minoru Gattacceca, Jérôme Osinski, G, R Dussouillez, P. Lepaulard, C. Champollion, C. Geophysical signature of the Tunnunik impact structure, Northwest Territories, Canada |
topic_facet |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience In 2011, the discovery of shatter cones confirmed the 28 km-diameter Tunnunik complex impact structure, Northwest Territories, Canada. This study presents the first results of ground-based electromagnetic, gravimetric and magnetic surveys over this impact structure. Its central area ischaracterized by a ~10 km wide negative gravity anomaly of about 3 mGal amplitude, roughly corresponding to the area of shatter cones, and associated with a positive magnetic field anomaly of ~120 nT amplitude and 3 km wavelength. The latter correlates well with the location of thedeepest uplifted strata, an impact-tilted Proterozoic dolomite layer of the Shaler Supergroup exposed near the center of the structure and intruded by dolerite dykes. Locally, electromagnetic field data unveil a conductive superficial formation which corresponds to an 80-100 m thick sandlayer covering the impact structure. Based on measurements of magnetic properties of rock samples, we model the source of the magnetic anomaly as the magnetic sediments of the Shaler Supergroup combined with a core of uplifted crystalline basement with enhanced magnetization. More classically, the low gravity signature is attributed to a reduction in density measured on the brecciated target rocks and to the isolated sand formations. However, the present-day fractured zone does not extend deeper than ~1 km in our model, indicating a possible 1.5 km of erosionsince the time of impact, about 430 Ma ago. |
author2 |
Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) University of Western Ontario (UWO) Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) IPEV1139French National Research Agency (ANR)ANR-11-IDEX-0001-02MITACSCampus FranceProgramme National de Planetologie (PNP) of INSU-CNRSCentre National D'etudes SpatialesCNRS Projet International de Cooperation Scientifique (PICS)263407 - GEOCRATNatural Sciences and Engineering Research Council of Canada (NSERC)CGIAR |
format |
Article in Journal/Newspaper |
author |
Quesnel, Yoann Zylberman, W. Rochette, P. Uehara, Minoru Gattacceca, Jérôme Osinski, G, R Dussouillez, P. Lepaulard, C. Champollion, C. |
author_facet |
Quesnel, Yoann Zylberman, W. Rochette, P. Uehara, Minoru Gattacceca, Jérôme Osinski, G, R Dussouillez, P. Lepaulard, C. Champollion, C. |
author_sort |
Quesnel, Yoann |
title |
Geophysical signature of the Tunnunik impact structure, Northwest Territories, Canada |
title_short |
Geophysical signature of the Tunnunik impact structure, Northwest Territories, Canada |
title_full |
Geophysical signature of the Tunnunik impact structure, Northwest Territories, Canada |
title_fullStr |
Geophysical signature of the Tunnunik impact structure, Northwest Territories, Canada |
title_full_unstemmed |
Geophysical signature of the Tunnunik impact structure, Northwest Territories, Canada |
title_sort |
geophysical signature of the tunnunik impact structure, northwest territories, canada |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://insu.hal.science/insu-02484453 https://insu.hal.science/insu-02484453v2/document https://insu.hal.science/insu-02484453v2/file/Quesnel_et_al_Tunnunik_MAPS_withFigures_accepted.pdf https://doi.org/10.1111/maps.13447 |
geographic |
Canada Northwest Territories |
geographic_facet |
Canada Northwest Territories |
genre |
Northwest Territories |
genre_facet |
Northwest Territories |
op_source |
ISSN: 1086-9379 EISSN: 1945-5100 Meteoritics and Planetary Science https://insu.hal.science/insu-02484453 Meteoritics and Planetary Science, 2020, 55 (3), pp.480-495. ⟨10.1111/maps.13447⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/maps.13447 insu-02484453 https://insu.hal.science/insu-02484453 https://insu.hal.science/insu-02484453v2/document https://insu.hal.science/insu-02484453v2/file/Quesnel_et_al_Tunnunik_MAPS_withFigures_accepted.pdf doi:10.1111/maps.13447 WOS: 000513882900001 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1111/maps.13447 |
container_title |
Meteoritics & Planetary Science |
container_volume |
55 |
container_issue |
3 |
container_start_page |
480 |
op_container_end_page |
495 |
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1788700010881220608 |
spelling |
ftccsdartic:oai:HAL:insu-02484453v2 2024-01-21T10:09:06+01:00 Geophysical signature of the Tunnunik impact structure, Northwest Territories, Canada Quesnel, Yoann Zylberman, W. Rochette, P. Uehara, Minoru Gattacceca, Jérôme Osinski, G, R Dussouillez, P. Lepaulard, C. Champollion, C. Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) University of Western Ontario (UWO) Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) IPEV1139French National Research Agency (ANR)ANR-11-IDEX-0001-02MITACSCampus FranceProgramme National de Planetologie (PNP) of INSU-CNRSCentre National D'etudes SpatialesCNRS Projet International de Cooperation Scientifique (PICS)263407 - GEOCRATNatural Sciences and Engineering Research Council of Canada (NSERC)CGIAR 2020 https://insu.hal.science/insu-02484453 https://insu.hal.science/insu-02484453v2/document https://insu.hal.science/insu-02484453v2/file/Quesnel_et_al_Tunnunik_MAPS_withFigures_accepted.pdf https://doi.org/10.1111/maps.13447 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/maps.13447 insu-02484453 https://insu.hal.science/insu-02484453 https://insu.hal.science/insu-02484453v2/document https://insu.hal.science/insu-02484453v2/file/Quesnel_et_al_Tunnunik_MAPS_withFigures_accepted.pdf doi:10.1111/maps.13447 WOS: 000513882900001 http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess ISSN: 1086-9379 EISSN: 1945-5100 Meteoritics and Planetary Science https://insu.hal.science/insu-02484453 Meteoritics and Planetary Science, 2020, 55 (3), pp.480-495. ⟨10.1111/maps.13447⟩ [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.1111/maps.13447 2023-12-23T23:31:33Z International audience In 2011, the discovery of shatter cones confirmed the 28 km-diameter Tunnunik complex impact structure, Northwest Territories, Canada. This study presents the first results of ground-based electromagnetic, gravimetric and magnetic surveys over this impact structure. Its central area ischaracterized by a ~10 km wide negative gravity anomaly of about 3 mGal amplitude, roughly corresponding to the area of shatter cones, and associated with a positive magnetic field anomaly of ~120 nT amplitude and 3 km wavelength. The latter correlates well with the location of thedeepest uplifted strata, an impact-tilted Proterozoic dolomite layer of the Shaler Supergroup exposed near the center of the structure and intruded by dolerite dykes. Locally, electromagnetic field data unveil a conductive superficial formation which corresponds to an 80-100 m thick sandlayer covering the impact structure. Based on measurements of magnetic properties of rock samples, we model the source of the magnetic anomaly as the magnetic sediments of the Shaler Supergroup combined with a core of uplifted crystalline basement with enhanced magnetization. More classically, the low gravity signature is attributed to a reduction in density measured on the brecciated target rocks and to the isolated sand formations. However, the present-day fractured zone does not extend deeper than ~1 km in our model, indicating a possible 1.5 km of erosionsince the time of impact, about 430 Ma ago. Article in Journal/Newspaper Northwest Territories Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Canada Northwest Territories Meteoritics & Planetary Science 55 3 480 495 |