Using 10 Be dating to determine when the Cordilleran Ice Sheet stopped flowing over the Canadian Rocky Mountains
International audience Abstract During the last glacial maximum the Cordilleran and Laurentide ice sheets coalesced east of the Rocky Mountains and geomorphological evidence indicates ice flowed over the main ridge of the Rocky Mountains between ~54–56°N. However, this ice flow has thus far remained...
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Online Access: | https://hal.archives-ouvertes.fr/hal-03266715 https://doi.org/10.1017/qua.2020.122 |
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ftccsdartic:oai:HAL:hal-03266715v1 2023-05-15T16:40:33+02:00 Using 10 Be dating to determine when the Cordilleran Ice Sheet stopped flowing over the Canadian Rocky Mountains Dulfer, Helen Margold, Martin Engel, Zbynĕk Braucher, Régis Team, Aster Charles University Prague (CU) Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD) 2021 https://hal.archives-ouvertes.fr/hal-03266715 https://doi.org/10.1017/qua.2020.122 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1017/qua.2020.122 hal-03266715 https://hal.archives-ouvertes.fr/hal-03266715 doi:10.1017/qua.2020.122 ISSN: 0033-5894 EISSN: 1096-0287 Quaternary Research https://hal.archives-ouvertes.fr/hal-03266715 Quaternary Research, Elsevier, In press, pp.1-12. ⟨10.1017/qua.2020.122⟩ [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDE.MCG]Environmental Sciences/Global Changes [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1017/qua.2020.122 2021-11-13T23:46:46Z International audience Abstract During the last glacial maximum the Cordilleran and Laurentide ice sheets coalesced east of the Rocky Mountains and geomorphological evidence indicates ice flowed over the main ridge of the Rocky Mountains between ~54–56°N. However, this ice flow has thus far remained unconstrained in time. Here we use in situ produced cosmogenic 10 Be dating to determine when Cordilleran ice stopped flowing over the mountain range. We dated eight samples from two sites: one on the western side (Mount Morfee) and one on the eastern side (Mount Spieker) of the Rocky Mountains. At Mount Spieker, one sample is rejected as an outlier and the remaining three give an apparent weighted mean exposure age of 15.6 ± 0.6 ka. The four samples at Mount Morfee are well clustered in time and give an apparent weighted mean exposure age of 12.2 ± 0.4 ka. These ages indicate that Mount Spieker became ice free before the Bølling warming and that the western front of the Rocky Mountains (Mount Morfee) remained in contact with the Cordilleran Ice Sheet until the Younger Dryas. Article in Journal/Newspaper Ice Sheet Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Quaternary Research 1 12 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDE.MCG]Environmental Sciences/Global Changes [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDE.MCG]Environmental Sciences/Global Changes [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Dulfer, Helen Margold, Martin Engel, Zbynĕk Braucher, Régis Team, Aster Using 10 Be dating to determine when the Cordilleran Ice Sheet stopped flowing over the Canadian Rocky Mountains |
topic_facet |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDE.MCG]Environmental Sciences/Global Changes [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Abstract During the last glacial maximum the Cordilleran and Laurentide ice sheets coalesced east of the Rocky Mountains and geomorphological evidence indicates ice flowed over the main ridge of the Rocky Mountains between ~54–56°N. However, this ice flow has thus far remained unconstrained in time. Here we use in situ produced cosmogenic 10 Be dating to determine when Cordilleran ice stopped flowing over the mountain range. We dated eight samples from two sites: one on the western side (Mount Morfee) and one on the eastern side (Mount Spieker) of the Rocky Mountains. At Mount Spieker, one sample is rejected as an outlier and the remaining three give an apparent weighted mean exposure age of 15.6 ± 0.6 ka. The four samples at Mount Morfee are well clustered in time and give an apparent weighted mean exposure age of 12.2 ± 0.4 ka. These ages indicate that Mount Spieker became ice free before the Bølling warming and that the western front of the Rocky Mountains (Mount Morfee) remained in contact with the Cordilleran Ice Sheet until the Younger Dryas. |
author2 |
Charles University Prague (CU) Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD) |
format |
Article in Journal/Newspaper |
author |
Dulfer, Helen Margold, Martin Engel, Zbynĕk Braucher, Régis Team, Aster |
author_facet |
Dulfer, Helen Margold, Martin Engel, Zbynĕk Braucher, Régis Team, Aster |
author_sort |
Dulfer, Helen |
title |
Using 10 Be dating to determine when the Cordilleran Ice Sheet stopped flowing over the Canadian Rocky Mountains |
title_short |
Using 10 Be dating to determine when the Cordilleran Ice Sheet stopped flowing over the Canadian Rocky Mountains |
title_full |
Using 10 Be dating to determine when the Cordilleran Ice Sheet stopped flowing over the Canadian Rocky Mountains |
title_fullStr |
Using 10 Be dating to determine when the Cordilleran Ice Sheet stopped flowing over the Canadian Rocky Mountains |
title_full_unstemmed |
Using 10 Be dating to determine when the Cordilleran Ice Sheet stopped flowing over the Canadian Rocky Mountains |
title_sort |
using 10 be dating to determine when the cordilleran ice sheet stopped flowing over the canadian rocky mountains |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.archives-ouvertes.fr/hal-03266715 https://doi.org/10.1017/qua.2020.122 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
ISSN: 0033-5894 EISSN: 1096-0287 Quaternary Research https://hal.archives-ouvertes.fr/hal-03266715 Quaternary Research, Elsevier, In press, pp.1-12. ⟨10.1017/qua.2020.122⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/qua.2020.122 hal-03266715 https://hal.archives-ouvertes.fr/hal-03266715 doi:10.1017/qua.2020.122 |
op_doi |
https://doi.org/10.1017/qua.2020.122 |
container_title |
Quaternary Research |
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1 |
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12 |
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1766030950124224512 |