Constraining the Late Pleistocene history of the Laurentide Ice Sheet by dating the Missinaibi Formation, Hudson Bay Lowlands, Canada.
Well-dated paleorecords from periods prior to the Last Glacial Maximum (LGM) are important for validating models of ice sheet build-up and growth. However, owing to glacial erosion, most Late Pleistocene records lie outside of the previously glaciated region, which limits their ability to inform abo...
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Elsevier
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Online Access: | http://dro.dur.ac.uk/25893/ http://dro.dur.ac.uk/25893/1/25893.pdf https://doi.org/10.1016/j.quascirev.2016.06.015 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:25893 2023-05-15T16:35:25+02:00 Constraining the Late Pleistocene history of the Laurentide Ice Sheet by dating the Missinaibi Formation, Hudson Bay Lowlands, Canada. Dalton, April S. Finkelstein, Sarah A. Barnett, Peter J. Forman, Steven L. 2016-08-15 application/pdf http://dro.dur.ac.uk/25893/ http://dro.dur.ac.uk/25893/1/25893.pdf https://doi.org/10.1016/j.quascirev.2016.06.015 unknown Elsevier dro:25893 issn:0277-3791 doi:10.1016/j.quascirev.2016.06.015 http://dro.dur.ac.uk/25893/ https://doi.org/10.1016/j.quascirev.2016.06.015 http://dro.dur.ac.uk/25893/1/25893.pdf © 2016 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Quaternary science reviews, 2016, Vol.146, pp.288-299 [Peer Reviewed Journal] Article PeerReviewed 2016 ftunivdurham https://doi.org/10.1016/j.quascirev.2016.06.015 2020-06-04T22:24:55Z Well-dated paleorecords from periods prior to the Last Glacial Maximum (LGM) are important for validating models of ice sheet build-up and growth. However, owing to glacial erosion, most Late Pleistocene records lie outside of the previously glaciated region, which limits their ability to inform about the dynamics of paleo-ice sheets. Here, we evaluate new and previously published chronology data from the Missinaibi Formation, a Pleistocene-aged deposit in the Hudson Bay Lowlands (HBL), Canada, located near the geographic center of the Laurentide Ice Sheet (LIS). Available radiocarbon (AMS = 44, conventional = 36), amino acid (n = 13), uranium-thorium (U-Th, n = 14), thermoluminescence (TL, n = 15) and optically stimulated luminescence (OSL, n = 5) data suggest that an ice-free HBL may have been possible during parts of Marine Isotope Stage 7 (MIS 7; ca. 243,000 to ca. 190,000 yr BP), MIS 5 (ca. 130,000 to ca. 71,000 yr BP) and MIS 3 (ca. 29,000 to ca. 57,000). While MIS 7 and MIS 5 are well-documented interglacial periods, the development of peat, forest bed and fluvial deposits dating to MIS 3 (n = 20 radiocarbon dates; 4 TL dates, 3 OSL dates), suggests that the LIS retreated and remained beyond, or somewhere within, the boundaries of the HBL during this interstadial. Ice sheet models approximate the margin of the LIS to Southern Ontario during this time, which is 700 km south of the HBL. Therefore, if correct, our data help constrain a significantly different configuration and dynamicity for the LIS than previously modelled. We can find no chronological basis to discount the MIS 3 age assignments. However, since most data originate from radiocarbon dates lying close to the reliable limit of this geochronometer, future work on dating the Missinaibi Formation using other geochronological methods (e.g. U-Th, OSL) is necessary in order to confirm the age estimates and strengthen the boundaries of the LIS during this period. Article in Journal/Newspaper Hudson Bay Ice Sheet Durham University: Durham Research Online Canada Hudson Hudson Bay Quaternary Science Reviews 146 288 299 |
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Open Polar |
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Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
Well-dated paleorecords from periods prior to the Last Glacial Maximum (LGM) are important for validating models of ice sheet build-up and growth. However, owing to glacial erosion, most Late Pleistocene records lie outside of the previously glaciated region, which limits their ability to inform about the dynamics of paleo-ice sheets. Here, we evaluate new and previously published chronology data from the Missinaibi Formation, a Pleistocene-aged deposit in the Hudson Bay Lowlands (HBL), Canada, located near the geographic center of the Laurentide Ice Sheet (LIS). Available radiocarbon (AMS = 44, conventional = 36), amino acid (n = 13), uranium-thorium (U-Th, n = 14), thermoluminescence (TL, n = 15) and optically stimulated luminescence (OSL, n = 5) data suggest that an ice-free HBL may have been possible during parts of Marine Isotope Stage 7 (MIS 7; ca. 243,000 to ca. 190,000 yr BP), MIS 5 (ca. 130,000 to ca. 71,000 yr BP) and MIS 3 (ca. 29,000 to ca. 57,000). While MIS 7 and MIS 5 are well-documented interglacial periods, the development of peat, forest bed and fluvial deposits dating to MIS 3 (n = 20 radiocarbon dates; 4 TL dates, 3 OSL dates), suggests that the LIS retreated and remained beyond, or somewhere within, the boundaries of the HBL during this interstadial. Ice sheet models approximate the margin of the LIS to Southern Ontario during this time, which is 700 km south of the HBL. Therefore, if correct, our data help constrain a significantly different configuration and dynamicity for the LIS than previously modelled. We can find no chronological basis to discount the MIS 3 age assignments. However, since most data originate from radiocarbon dates lying close to the reliable limit of this geochronometer, future work on dating the Missinaibi Formation using other geochronological methods (e.g. U-Th, OSL) is necessary in order to confirm the age estimates and strengthen the boundaries of the LIS during this period. |
format |
Article in Journal/Newspaper |
author |
Dalton, April S. Finkelstein, Sarah A. Barnett, Peter J. Forman, Steven L. |
spellingShingle |
Dalton, April S. Finkelstein, Sarah A. Barnett, Peter J. Forman, Steven L. Constraining the Late Pleistocene history of the Laurentide Ice Sheet by dating the Missinaibi Formation, Hudson Bay Lowlands, Canada. |
author_facet |
Dalton, April S. Finkelstein, Sarah A. Barnett, Peter J. Forman, Steven L. |
author_sort |
Dalton, April S. |
title |
Constraining the Late Pleistocene history of the Laurentide Ice Sheet by dating the Missinaibi Formation, Hudson Bay Lowlands, Canada. |
title_short |
Constraining the Late Pleistocene history of the Laurentide Ice Sheet by dating the Missinaibi Formation, Hudson Bay Lowlands, Canada. |
title_full |
Constraining the Late Pleistocene history of the Laurentide Ice Sheet by dating the Missinaibi Formation, Hudson Bay Lowlands, Canada. |
title_fullStr |
Constraining the Late Pleistocene history of the Laurentide Ice Sheet by dating the Missinaibi Formation, Hudson Bay Lowlands, Canada. |
title_full_unstemmed |
Constraining the Late Pleistocene history of the Laurentide Ice Sheet by dating the Missinaibi Formation, Hudson Bay Lowlands, Canada. |
title_sort |
constraining the late pleistocene history of the laurentide ice sheet by dating the missinaibi formation, hudson bay lowlands, canada. |
publisher |
Elsevier |
publishDate |
2016 |
url |
http://dro.dur.ac.uk/25893/ http://dro.dur.ac.uk/25893/1/25893.pdf https://doi.org/10.1016/j.quascirev.2016.06.015 |
geographic |
Canada Hudson Hudson Bay |
geographic_facet |
Canada Hudson Hudson Bay |
genre |
Hudson Bay Ice Sheet |
genre_facet |
Hudson Bay Ice Sheet |
op_source |
Quaternary science reviews, 2016, Vol.146, pp.288-299 [Peer Reviewed Journal] |
op_relation |
dro:25893 issn:0277-3791 doi:10.1016/j.quascirev.2016.06.015 http://dro.dur.ac.uk/25893/ https://doi.org/10.1016/j.quascirev.2016.06.015 http://dro.dur.ac.uk/25893/1/25893.pdf |
op_rights |
© 2016 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.quascirev.2016.06.015 |
container_title |
Quaternary Science Reviews |
container_volume |
146 |
container_start_page |
288 |
op_container_end_page |
299 |
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1766025635325542400 |