Flow‐pattern evolution of the Laurentide and Cordilleran ice sheets across west‐central Alberta, Canada: implications for ice sheet growth, retreat and dynamics during the last glacial cycle
ABSTRACT This paper presents a reconstruction of the geometry, dynamics and flow pattern of the Laurentide and Cordilleran ice sheets along the Albertan portion of the eastern Canadian Rocky Mountains during the last glaciation. Sediment–landform associations relating to the evolution of these ice s...
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crwiley:10.1002/jqs.2901 2024-06-02T08:03:05+00:00 Flow‐pattern evolution of the Laurentide and Cordilleran ice sheets across west‐central Alberta, Canada: implications for ice sheet growth, retreat and dynamics during the last glacial cycle Atkinson, Nigel Pawley, Steven Utting, Daniel J. 2016 http://dx.doi.org/10.1002/jqs.2901 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2901 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2901 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 31, issue 7, page 753-768 ISSN 0267-8179 1099-1417 journal-article 2016 crwiley https://doi.org/10.1002/jqs.2901 2024-05-03T11:27:20Z ABSTRACT This paper presents a reconstruction of the geometry, dynamics and flow pattern of the Laurentide and Cordilleran ice sheets along the Albertan portion of the eastern Canadian Rocky Mountains during the last glaciation. Sediment–landform associations relating to the evolution of these ice sheets document their initial convergence and mutual deflection across west‐central Alberta. The continued advance of Laurentide ice locally displaced Cordilleran ice westward into the Front Ranges, and deflected trunk ice emerging from the Athabasca River valley south‐eastwards along the Foothills. These convergent flow patterns remained major features in the regional geometry of both ice sheets throughout the Last Glacial Maximum. The onset of deglaciation was characterized by the northward retreat of the Laurentide Ice Sheet, which progressively unblocked valleys along the mountain front. The configuration of buttress removal initiated the Lateglacial expansion and sequential drawdown of the eastern Cordilleran Ice Sheet along fast‐flowing outlet glaciers. Subsequent regional retreat of Laurentide and Cordilleran ice was associated with the development of large proglacial lakes which amplified deglaciation by destabilizing the margins of both ice sheets, triggering extensive readvances due to periodic changes in water level associated with the opening and closing of outlets by ice margin fluctuations. Article in Journal/Newspaper Athabasca River Ice Sheet Wiley Online Library Athabasca River Buttress ENVELOPE(-57.083,-57.083,-63.550,-63.550) Canada Journal of Quaternary Science 31 7 753 768 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
ABSTRACT This paper presents a reconstruction of the geometry, dynamics and flow pattern of the Laurentide and Cordilleran ice sheets along the Albertan portion of the eastern Canadian Rocky Mountains during the last glaciation. Sediment–landform associations relating to the evolution of these ice sheets document their initial convergence and mutual deflection across west‐central Alberta. The continued advance of Laurentide ice locally displaced Cordilleran ice westward into the Front Ranges, and deflected trunk ice emerging from the Athabasca River valley south‐eastwards along the Foothills. These convergent flow patterns remained major features in the regional geometry of both ice sheets throughout the Last Glacial Maximum. The onset of deglaciation was characterized by the northward retreat of the Laurentide Ice Sheet, which progressively unblocked valleys along the mountain front. The configuration of buttress removal initiated the Lateglacial expansion and sequential drawdown of the eastern Cordilleran Ice Sheet along fast‐flowing outlet glaciers. Subsequent regional retreat of Laurentide and Cordilleran ice was associated with the development of large proglacial lakes which amplified deglaciation by destabilizing the margins of both ice sheets, triggering extensive readvances due to periodic changes in water level associated with the opening and closing of outlets by ice margin fluctuations. |
format |
Article in Journal/Newspaper |
author |
Atkinson, Nigel Pawley, Steven Utting, Daniel J. |
spellingShingle |
Atkinson, Nigel Pawley, Steven Utting, Daniel J. Flow‐pattern evolution of the Laurentide and Cordilleran ice sheets across west‐central Alberta, Canada: implications for ice sheet growth, retreat and dynamics during the last glacial cycle |
author_facet |
Atkinson, Nigel Pawley, Steven Utting, Daniel J. |
author_sort |
Atkinson, Nigel |
title |
Flow‐pattern evolution of the Laurentide and Cordilleran ice sheets across west‐central Alberta, Canada: implications for ice sheet growth, retreat and dynamics during the last glacial cycle |
title_short |
Flow‐pattern evolution of the Laurentide and Cordilleran ice sheets across west‐central Alberta, Canada: implications for ice sheet growth, retreat and dynamics during the last glacial cycle |
title_full |
Flow‐pattern evolution of the Laurentide and Cordilleran ice sheets across west‐central Alberta, Canada: implications for ice sheet growth, retreat and dynamics during the last glacial cycle |
title_fullStr |
Flow‐pattern evolution of the Laurentide and Cordilleran ice sheets across west‐central Alberta, Canada: implications for ice sheet growth, retreat and dynamics during the last glacial cycle |
title_full_unstemmed |
Flow‐pattern evolution of the Laurentide and Cordilleran ice sheets across west‐central Alberta, Canada: implications for ice sheet growth, retreat and dynamics during the last glacial cycle |
title_sort |
flow‐pattern evolution of the laurentide and cordilleran ice sheets across west‐central alberta, canada: implications for ice sheet growth, retreat and dynamics during the last glacial cycle |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1002/jqs.2901 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2901 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2901 |
long_lat |
ENVELOPE(-57.083,-57.083,-63.550,-63.550) |
geographic |
Athabasca River Buttress Canada |
geographic_facet |
Athabasca River Buttress Canada |
genre |
Athabasca River Ice Sheet |
genre_facet |
Athabasca River Ice Sheet |
op_source |
Journal of Quaternary Science volume 31, issue 7, page 753-768 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.2901 |
container_title |
Journal of Quaternary Science |
container_volume |
31 |
container_issue |
7 |
container_start_page |
753 |
op_container_end_page |
768 |
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1800747547316191232 |