Was there a nonglacial episode in the western Hudson Bay Lowland during Marine Isotope Stage 3?
Abstract Establishing the timing of glacial and nonglacial intervals in the core regions of the Laurentide Ice Sheet (LIS) is essential to constrain ice-sheet configuration at times of globally reduced ice volume, such as during Marine Isotope Stage (MIS) 3 (~57–29 ka). Hudson Bay Lowland (HBL) degl...
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Cambridge University Press (CUP)
2023
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Online Access: | http://dx.doi.org/10.1017/qua.2023.35 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589423000352 |
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crcambridgeupr:10.1017/qua.2023.35 2024-09-15T18:11:02+00:00 Was there a nonglacial episode in the western Hudson Bay Lowland during Marine Isotope Stage 3? Hodder, Tyler J. Gauthier, Michelle S. Ross, Martin Lian, Olav B. 2023 http://dx.doi.org/10.1017/qua.2023.35 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589423000352 en eng Cambridge University Press (CUP) https://creativecommons.org/licenses/by/4.0/ Quaternary Research volume 116, page 148-161 ISSN 0033-5894 1096-0287 journal-article 2023 crcambridgeupr https://doi.org/10.1017/qua.2023.35 2024-07-17T04:04:24Z Abstract Establishing the timing of glacial and nonglacial intervals in the core regions of the Laurentide Ice Sheet (LIS) is essential to constrain ice-sheet configuration at times of globally reduced ice volume, such as during Marine Isotope Stage (MIS) 3 (~57–29 ka). Hudson Bay Lowland (HBL) deglaciation, at the centre of the LIS, has been inferred at MIS 3 based on near-infinite wood radiocarbon ages and limited luminescence ages. To better constrain the age of the penultimate deglaciation of the western HBL, this study initially identified the youngest intertill nonglacial sediments, based on extensive fieldwork and till characterization. Next, vetted radiocarbon ages were combined with revised stratigraphy to show that five previously identified “MIS 3” sites were likely deposited during an earlier ice-free period. Finally, new optical ages targeting the youngest intertill nonglacial bed at three localities yielded ages ranging from 166 to 146 ka; all older than MIS 3. These ages indicate that the penultimate deglaciation of the western HBL likely occurred during MIS 5e. This interpretation better explains accompanying paleobotanic data sets that indicate vegetation similar to vegetation existing under present interglacial conditions. Currently no firm evidence exists in the terrestrial stratigraphic record for the deglaciation of the western HBL during MIS 3. Article in Journal/Newspaper Hudson Bay Ice Sheet Cambridge University Press Quaternary Research 116 148 161 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Establishing the timing of glacial and nonglacial intervals in the core regions of the Laurentide Ice Sheet (LIS) is essential to constrain ice-sheet configuration at times of globally reduced ice volume, such as during Marine Isotope Stage (MIS) 3 (~57–29 ka). Hudson Bay Lowland (HBL) deglaciation, at the centre of the LIS, has been inferred at MIS 3 based on near-infinite wood radiocarbon ages and limited luminescence ages. To better constrain the age of the penultimate deglaciation of the western HBL, this study initially identified the youngest intertill nonglacial sediments, based on extensive fieldwork and till characterization. Next, vetted radiocarbon ages were combined with revised stratigraphy to show that five previously identified “MIS 3” sites were likely deposited during an earlier ice-free period. Finally, new optical ages targeting the youngest intertill nonglacial bed at three localities yielded ages ranging from 166 to 146 ka; all older than MIS 3. These ages indicate that the penultimate deglaciation of the western HBL likely occurred during MIS 5e. This interpretation better explains accompanying paleobotanic data sets that indicate vegetation similar to vegetation existing under present interglacial conditions. Currently no firm evidence exists in the terrestrial stratigraphic record for the deglaciation of the western HBL during MIS 3. |
format |
Article in Journal/Newspaper |
author |
Hodder, Tyler J. Gauthier, Michelle S. Ross, Martin Lian, Olav B. |
spellingShingle |
Hodder, Tyler J. Gauthier, Michelle S. Ross, Martin Lian, Olav B. Was there a nonglacial episode in the western Hudson Bay Lowland during Marine Isotope Stage 3? |
author_facet |
Hodder, Tyler J. Gauthier, Michelle S. Ross, Martin Lian, Olav B. |
author_sort |
Hodder, Tyler J. |
title |
Was there a nonglacial episode in the western Hudson Bay Lowland during Marine Isotope Stage 3? |
title_short |
Was there a nonglacial episode in the western Hudson Bay Lowland during Marine Isotope Stage 3? |
title_full |
Was there a nonglacial episode in the western Hudson Bay Lowland during Marine Isotope Stage 3? |
title_fullStr |
Was there a nonglacial episode in the western Hudson Bay Lowland during Marine Isotope Stage 3? |
title_full_unstemmed |
Was there a nonglacial episode in the western Hudson Bay Lowland during Marine Isotope Stage 3? |
title_sort |
was there a nonglacial episode in the western hudson bay lowland during marine isotope stage 3? |
publisher |
Cambridge University Press (CUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1017/qua.2023.35 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589423000352 |
genre |
Hudson Bay Ice Sheet |
genre_facet |
Hudson Bay Ice Sheet |
op_source |
Quaternary Research volume 116, page 148-161 ISSN 0033-5894 1096-0287 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/qua.2023.35 |
container_title |
Quaternary Research |
container_volume |
116 |
container_start_page |
148 |
op_container_end_page |
161 |
_version_ |
1810448640477495296 |