Basal-flow conditions at the northeastern margin of the Laurentide Ice Sheet, Lancaster Sound
A major moraine system developed by outlet glaciers of the Laurentide Ice Sheet on coastal mountains of Bylot Island provides a basis for reconstructing paleoglacier surfaces and estimating basal shear stresses within the ice. The system, named Eclipse moraine, lies between elevations of 100 and 500...
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Language: | English |
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Canadian Science Publishing
1988
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Online Access: | http://dx.doi.org/10.1139/e88-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/e88-165 |
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crcansciencepubl:10.1139/e88-165 2024-09-15T17:56:58+00:00 Basal-flow conditions at the northeastern margin of the Laurentide Ice Sheet, Lancaster Sound Klassen, R. A. Fisher, D. A. 1988 http://dx.doi.org/10.1139/e88-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/e88-165 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 25, issue 11, page 1740-1750 ISSN 0008-4077 1480-3313 journal-article 1988 crcansciencepubl https://doi.org/10.1139/e88-165 2024-07-25T04:10:03Z A major moraine system developed by outlet glaciers of the Laurentide Ice Sheet on coastal mountains of Bylot Island provides a basis for reconstructing paleoglacier surfaces and estimating basal shear stresses within the ice. The system, named Eclipse moraine, lies between elevations of 100 and 500 m asl and can be traced almost continuously over distances of 50–70 km. Where the glaciers flowed inland within valleys, the outline of the moraine on valley walls is used to portray the profile of the glacier along the valley median. If ideal plastic flow is assumed, ice thicknesses and surface slopes derived from the reconstructed profiles indicate yield stresses of about 125 ± 46 kPa. Reconstructed profiles of the main outlet glaciers entering Baffin Bay from Lancaster Sound and Pond Inlet indicate lesser yield stresses of about 55–80 kPa, respectively, within the channels; estimates are 35–60 kPa if isostatic depression is assumed. Calculations indicate mat basal shear stresses in the channels were near the low end of the range characteristic of modern ice sheets and ice caps. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Bylot Island Ice Sheet Lancaster Sound Pond Inlet Canadian Science Publishing Canadian Journal of Earth Sciences 25 11 1740 1750 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
A major moraine system developed by outlet glaciers of the Laurentide Ice Sheet on coastal mountains of Bylot Island provides a basis for reconstructing paleoglacier surfaces and estimating basal shear stresses within the ice. The system, named Eclipse moraine, lies between elevations of 100 and 500 m asl and can be traced almost continuously over distances of 50–70 km. Where the glaciers flowed inland within valleys, the outline of the moraine on valley walls is used to portray the profile of the glacier along the valley median. If ideal plastic flow is assumed, ice thicknesses and surface slopes derived from the reconstructed profiles indicate yield stresses of about 125 ± 46 kPa. Reconstructed profiles of the main outlet glaciers entering Baffin Bay from Lancaster Sound and Pond Inlet indicate lesser yield stresses of about 55–80 kPa, respectively, within the channels; estimates are 35–60 kPa if isostatic depression is assumed. Calculations indicate mat basal shear stresses in the channels were near the low end of the range characteristic of modern ice sheets and ice caps. |
format |
Article in Journal/Newspaper |
author |
Klassen, R. A. Fisher, D. A. |
spellingShingle |
Klassen, R. A. Fisher, D. A. Basal-flow conditions at the northeastern margin of the Laurentide Ice Sheet, Lancaster Sound |
author_facet |
Klassen, R. A. Fisher, D. A. |
author_sort |
Klassen, R. A. |
title |
Basal-flow conditions at the northeastern margin of the Laurentide Ice Sheet, Lancaster Sound |
title_short |
Basal-flow conditions at the northeastern margin of the Laurentide Ice Sheet, Lancaster Sound |
title_full |
Basal-flow conditions at the northeastern margin of the Laurentide Ice Sheet, Lancaster Sound |
title_fullStr |
Basal-flow conditions at the northeastern margin of the Laurentide Ice Sheet, Lancaster Sound |
title_full_unstemmed |
Basal-flow conditions at the northeastern margin of the Laurentide Ice Sheet, Lancaster Sound |
title_sort |
basal-flow conditions at the northeastern margin of the laurentide ice sheet, lancaster sound |
publisher |
Canadian Science Publishing |
publishDate |
1988 |
url |
http://dx.doi.org/10.1139/e88-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/e88-165 |
genre |
Baffin Bay Baffin Bay Baffin Bylot Island Ice Sheet Lancaster Sound Pond Inlet |
genre_facet |
Baffin Bay Baffin Bay Baffin Bylot Island Ice Sheet Lancaster Sound Pond Inlet |
op_source |
Canadian Journal of Earth Sciences volume 25, issue 11, page 1740-1750 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e88-165 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
25 |
container_issue |
11 |
container_start_page |
1740 |
op_container_end_page |
1750 |
_version_ |
1810433181656023040 |