Cenozoic Exhumation History of the Eastern Margin of the Northern Canadian Cordillera
International audience New low temperature thermochronology data from clastic sedimentary rocks in the northern Richardson Mountains, Canada, indicate significant exhumational cooling during late Eocene-early Oligocene time. Apatite (U Th Sm)/He (AHe) data were collected from 19 Proterozoic-Paleocen...
Published in: | Tectonics |
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Main Authors: | , , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Subjects: | |
Online Access: | https://insu.hal.science/insu-03661470 https://insu.hal.science/insu-03661470/document https://insu.hal.science/insu-03661470/file/Tectonics%20-%202021%20-%20McKay%20-%20Cenozoic%20Exhumation%20History%20of%20the%20Eastern%20Margin%20of%20the%20Northern%20Canadian%20Cordillera.pdf https://doi.org/10.1029/2020TC006582 |
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ftccsdartic:oai:HAL:insu-03661470v1 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
apatite (U Th)/He Canadian Cordillera North America Northwest Territories Richardson Mountains thermochronology [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
apatite (U Th)/He Canadian Cordillera North America Northwest Territories Richardson Mountains thermochronology [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Mckay, Ryan Enkelmann, Eva Hadlari, Thomas Matthews, William Mouthereau, Frédéric Cenozoic Exhumation History of the Eastern Margin of the Northern Canadian Cordillera |
topic_facet |
apatite (U Th)/He Canadian Cordillera North America Northwest Territories Richardson Mountains thermochronology [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience New low temperature thermochronology data from clastic sedimentary rocks in the northern Richardson Mountains, Canada, indicate significant exhumational cooling during late Eocene-early Oligocene time. Apatite (U Th Sm)/He (AHe) data were collected from 19 Proterozoic-Paleocene rocks across a 115 km transect. Eighty eight single grain AHe dates range from 16-300 Ma and are generally younger than stratigraphic ages, indicative of thermal resetting by burial. Additionally, zircon (U Th)/He (ZHe) dates from two Proterozoic-Cambrian rocks range from 49-123 Ma and suggest burial to >160°C. In contrast, ZHe dates from Jurassic sandstones are older than the stratigraphic age, which limits maximum burial to <160°C. Thermal history modeling reveals three phases of cooling, during the Paleocene-early Eocene (>65-50 Ma), late Eocene-early Oligocene (40-30 Ma), and late Oligocene-early Miocene (30-15 Ma). Most samples cooled during the first and second phases, whereas the third phase is less well constrained. In general, most rocks were below the sensitivity of AHe analysis since the early-middle Miocene. The results suggest a previously unrecognized phase of inferred deformation in the northern Richardson Mountains between 40-30 Ma. Our findings contribute to previous work that recognizes Late Cenozoic deformation along the eastern margin of the Northern Cordillera. We further investigated the potential mechanisms of this widespread deformation and suggest exhumation may relate to kinematic changes of the North American plate relative to structural trends along the margin of the Northern Cordillera. |
author2 |
Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Mckay, Ryan Enkelmann, Eva Hadlari, Thomas Matthews, William Mouthereau, Frédéric |
author_facet |
Mckay, Ryan Enkelmann, Eva Hadlari, Thomas Matthews, William Mouthereau, Frédéric |
author_sort |
Mckay, Ryan |
title |
Cenozoic Exhumation History of the Eastern Margin of the Northern Canadian Cordillera |
title_short |
Cenozoic Exhumation History of the Eastern Margin of the Northern Canadian Cordillera |
title_full |
Cenozoic Exhumation History of the Eastern Margin of the Northern Canadian Cordillera |
title_fullStr |
Cenozoic Exhumation History of the Eastern Margin of the Northern Canadian Cordillera |
title_full_unstemmed |
Cenozoic Exhumation History of the Eastern Margin of the Northern Canadian Cordillera |
title_sort |
cenozoic exhumation history of the eastern margin of the northern canadian cordillera |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://insu.hal.science/insu-03661470 https://insu.hal.science/insu-03661470/document https://insu.hal.science/insu-03661470/file/Tectonics%20-%202021%20-%20McKay%20-%20Cenozoic%20Exhumation%20History%20of%20the%20Eastern%20Margin%20of%20the%20Northern%20Canadian%20Cordillera.pdf https://doi.org/10.1029/2020TC006582 |
long_lat |
ENVELOPE(-136.171,-136.171,67.000,67.000) |
geographic |
Canada Northwest Territories Richardson Mountains |
geographic_facet |
Canada Northwest Territories Richardson Mountains |
genre |
Northwest Territories |
genre_facet |
Northwest Territories |
op_source |
ISSN: 0278-7407 EISSN: 1944-9194 Tectonics https://insu.hal.science/insu-03661470 Tectonics, 2021, 40, ⟨10.1029/2020TC006582⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020TC006582 insu-03661470 https://insu.hal.science/insu-03661470 https://insu.hal.science/insu-03661470/document https://insu.hal.science/insu-03661470/file/Tectonics%20-%202021%20-%20McKay%20-%20Cenozoic%20Exhumation%20History%20of%20the%20Eastern%20Margin%20of%20the%20Northern%20Canadian%20Cordillera.pdf BIBCODE: 2021Tecto.4006582M doi:10.1029/2020TC006582 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2020TC006582 |
container_title |
Tectonics |
container_volume |
40 |
container_issue |
4 |
_version_ |
1786197881486573568 |
spelling |
ftccsdartic:oai:HAL:insu-03661470v1 2023-12-24T10:23:43+01:00 Cenozoic Exhumation History of the Eastern Margin of the Northern Canadian Cordillera Mckay, Ryan Enkelmann, Eva Hadlari, Thomas Matthews, William Mouthereau, Frédéric Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) 2021 https://insu.hal.science/insu-03661470 https://insu.hal.science/insu-03661470/document https://insu.hal.science/insu-03661470/file/Tectonics%20-%202021%20-%20McKay%20-%20Cenozoic%20Exhumation%20History%20of%20the%20Eastern%20Margin%20of%20the%20Northern%20Canadian%20Cordillera.pdf https://doi.org/10.1029/2020TC006582 en eng HAL CCSD American Geophysical Union (AGU) info:eu-repo/semantics/altIdentifier/doi/10.1029/2020TC006582 insu-03661470 https://insu.hal.science/insu-03661470 https://insu.hal.science/insu-03661470/document https://insu.hal.science/insu-03661470/file/Tectonics%20-%202021%20-%20McKay%20-%20Cenozoic%20Exhumation%20History%20of%20the%20Eastern%20Margin%20of%20the%20Northern%20Canadian%20Cordillera.pdf BIBCODE: 2021Tecto.4006582M doi:10.1029/2020TC006582 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0278-7407 EISSN: 1944-9194 Tectonics https://insu.hal.science/insu-03661470 Tectonics, 2021, 40, ⟨10.1029/2020TC006582⟩ apatite (U Th)/He Canadian Cordillera North America Northwest Territories Richardson Mountains thermochronology [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1029/2020TC006582 2023-11-26T00:05:45Z International audience New low temperature thermochronology data from clastic sedimentary rocks in the northern Richardson Mountains, Canada, indicate significant exhumational cooling during late Eocene-early Oligocene time. Apatite (U Th Sm)/He (AHe) data were collected from 19 Proterozoic-Paleocene rocks across a 115 km transect. Eighty eight single grain AHe dates range from 16-300 Ma and are generally younger than stratigraphic ages, indicative of thermal resetting by burial. Additionally, zircon (U Th)/He (ZHe) dates from two Proterozoic-Cambrian rocks range from 49-123 Ma and suggest burial to >160°C. In contrast, ZHe dates from Jurassic sandstones are older than the stratigraphic age, which limits maximum burial to <160°C. Thermal history modeling reveals three phases of cooling, during the Paleocene-early Eocene (>65-50 Ma), late Eocene-early Oligocene (40-30 Ma), and late Oligocene-early Miocene (30-15 Ma). Most samples cooled during the first and second phases, whereas the third phase is less well constrained. In general, most rocks were below the sensitivity of AHe analysis since the early-middle Miocene. The results suggest a previously unrecognized phase of inferred deformation in the northern Richardson Mountains between 40-30 Ma. Our findings contribute to previous work that recognizes Late Cenozoic deformation along the eastern margin of the Northern Cordillera. We further investigated the potential mechanisms of this widespread deformation and suggest exhumation may relate to kinematic changes of the North American plate relative to structural trends along the margin of the Northern Cordillera. Article in Journal/Newspaper Northwest Territories Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Canada Northwest Territories Richardson Mountains ENVELOPE(-136.171,-136.171,67.000,67.000) Tectonics 40 4 |