Reconstructing the advance and retreat dynamics of the central sector of the last Cordilleran Ice Sheet
The advance of the Cordilleran Ice Sheet (CIS) towards its Last Glacial Maximum (LGM) configuration and its subsequent retreat remain poorly understood. We use the glacial landform record to determine ice dynamics for the central sector of the CIS in northern British Columbia, Canada, beneath the LG...
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2022
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Online Access: | https://research.manchester.ac.uk/en/publications/03dc6155-7b49-436b-8ac8-014ac05c5328 https://doi.org/10.1016/j.quascirev.2022.107465 |
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ftumanchesterpub:oai:pure.atira.dk:publications/03dc6155-7b49-436b-8ac8-014ac05c5328 2023-11-12T04:18:44+01:00 Reconstructing the advance and retreat dynamics of the central sector of the last Cordilleran Ice Sheet Dulfer, Helen E. Margold, Martin Darvill, Christopher Stroeven, Arjen P. 2022-05-15 https://research.manchester.ac.uk/en/publications/03dc6155-7b49-436b-8ac8-014ac05c5328 https://doi.org/10.1016/j.quascirev.2022.107465 eng eng info:eu-repo/semantics/openAccess Dulfer , H E , Margold , M , Darvill , C & Stroeven , A P 2022 , ' Reconstructing the advance and retreat dynamics of the central sector of the last Cordilleran Ice Sheet ' , Quaternary Science Reviews , vol. 284 , 107465 . https://doi.org/10.1016/j.quascirev.2022.107465 Pleistocene Paleoglaciology North America Glacial geomorphology article 2022 ftumanchesterpub https://doi.org/10.1016/j.quascirev.2022.107465 2023-10-30T09:13:00Z The advance of the Cordilleran Ice Sheet (CIS) towards its Last Glacial Maximum (LGM) configuration and its subsequent retreat remain poorly understood. We use the glacial landform record to determine ice dynamics for the central sector of the CIS in northern British Columbia, Canada, beneath the LGM ice divide. We classify seventy ice-flow indicator flowsets based on morphology, elevation, orientation and cross-cutting relationships into one of three stages, whereby stage 1 is oldest and stage 3 youngest. Combined with ice-contact geomorphology, our reconstruction highlights complex changes in ice flow over time as a result of ice divide migrations through the LGM and deglacial phases. The orientation and distribution of landforms indicates active post-LGM ice retreat westward through the Cassiar and Omineca mountains. We map the regional distribution of independent mountain glaciers, ice caps, and ice fields that regrew during a cooling event in the Late Glacial and show that some of these readvance glaciers were subsequently overrun by advancing outlet glaciers of the CIS. We use the cross-cutting relationship between readvance glaciers and CIS outlet glaciers and available chronological data to reconstruct the eastern CIS margin during the Late Glacial for the first time. Key words: Pleistocene, paleoglaciology, North America, glacial geomorphology. Article in Journal/Newspaper Ice Sheet The University of Manchester: Research Explorer Quaternary Science Reviews 284 107465 |
institution |
Open Polar |
collection |
The University of Manchester: Research Explorer |
op_collection_id |
ftumanchesterpub |
language |
English |
topic |
Pleistocene Paleoglaciology North America Glacial geomorphology |
spellingShingle |
Pleistocene Paleoglaciology North America Glacial geomorphology Dulfer, Helen E. Margold, Martin Darvill, Christopher Stroeven, Arjen P. Reconstructing the advance and retreat dynamics of the central sector of the last Cordilleran Ice Sheet |
topic_facet |
Pleistocene Paleoglaciology North America Glacial geomorphology |
description |
The advance of the Cordilleran Ice Sheet (CIS) towards its Last Glacial Maximum (LGM) configuration and its subsequent retreat remain poorly understood. We use the glacial landform record to determine ice dynamics for the central sector of the CIS in northern British Columbia, Canada, beneath the LGM ice divide. We classify seventy ice-flow indicator flowsets based on morphology, elevation, orientation and cross-cutting relationships into one of three stages, whereby stage 1 is oldest and stage 3 youngest. Combined with ice-contact geomorphology, our reconstruction highlights complex changes in ice flow over time as a result of ice divide migrations through the LGM and deglacial phases. The orientation and distribution of landforms indicates active post-LGM ice retreat westward through the Cassiar and Omineca mountains. We map the regional distribution of independent mountain glaciers, ice caps, and ice fields that regrew during a cooling event in the Late Glacial and show that some of these readvance glaciers were subsequently overrun by advancing outlet glaciers of the CIS. We use the cross-cutting relationship between readvance glaciers and CIS outlet glaciers and available chronological data to reconstruct the eastern CIS margin during the Late Glacial for the first time. Key words: Pleistocene, paleoglaciology, North America, glacial geomorphology. |
format |
Article in Journal/Newspaper |
author |
Dulfer, Helen E. Margold, Martin Darvill, Christopher Stroeven, Arjen P. |
author_facet |
Dulfer, Helen E. Margold, Martin Darvill, Christopher Stroeven, Arjen P. |
author_sort |
Dulfer, Helen E. |
title |
Reconstructing the advance and retreat dynamics of the central sector of the last Cordilleran Ice Sheet |
title_short |
Reconstructing the advance and retreat dynamics of the central sector of the last Cordilleran Ice Sheet |
title_full |
Reconstructing the advance and retreat dynamics of the central sector of the last Cordilleran Ice Sheet |
title_fullStr |
Reconstructing the advance and retreat dynamics of the central sector of the last Cordilleran Ice Sheet |
title_full_unstemmed |
Reconstructing the advance and retreat dynamics of the central sector of the last Cordilleran Ice Sheet |
title_sort |
reconstructing the advance and retreat dynamics of the central sector of the last cordilleran ice sheet |
publishDate |
2022 |
url |
https://research.manchester.ac.uk/en/publications/03dc6155-7b49-436b-8ac8-014ac05c5328 https://doi.org/10.1016/j.quascirev.2022.107465 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Dulfer , H E , Margold , M , Darvill , C & Stroeven , A P 2022 , ' Reconstructing the advance and retreat dynamics of the central sector of the last Cordilleran Ice Sheet ' , Quaternary Science Reviews , vol. 284 , 107465 . https://doi.org/10.1016/j.quascirev.2022.107465 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2022.107465 |
container_title |
Quaternary Science Reviews |
container_volume |
284 |
container_start_page |
107465 |
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1782335318883565568 |