The Nastapoka drift belt, eastern Hudson Bay: implications of a stillstand of the QuebecLabrador ice margin in the Tyrrell Sea at 8 ka BP
During deglaciation of eastern Hudson Bay, the western margin of the QuébecLabrador sector of the Laurentide Ice Sheet came to a stillstand about 8 14 C ka BP along the Nastapoka Hills, a series of topographic highs along the bay. These hills are the northward continuation of the eastern Hudson Bay...
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crcansciencepubl:10.1139/e02-085 2024-04-07T07:53:02+00:00 The Nastapoka drift belt, eastern Hudson Bay: implications of a stillstand of the QuebecLabrador ice margin in the Tyrrell Sea at 8 ka BP Lajeunesse, Patrick Allard, Michel 2003 http://dx.doi.org/10.1139/e02-085 http://www.nrcresearchpress.com/doi/pdf/10.1139/e02-085 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 40, issue 1, page 65-76 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2003 crcansciencepubl https://doi.org/10.1139/e02-085 2024-03-08T00:37:45Z During deglaciation of eastern Hudson Bay, the western margin of the QuébecLabrador sector of the Laurentide Ice Sheet came to a stillstand about 8 14 C ka BP along the Nastapoka Hills, a series of topographic highs along the bay. These hills are the northward continuation of the eastern Hudson Bay cuesta system. It left a drift belt consisting of ice-contact submarine fans along the western slopes of the hills, small frontal moraines on hilltops, and grounding-line deposits on sills between the hills. Geomorphological, sedimentary, and radiometric evidence suggest that the stillstand responsible for deposition of the Nastapoka drift belt was either entirely or partly synchronous with the deposition of the Sakami moraine farther south. There was a period when these two morainic systems marked a continuous ice margin. These stillstands occurred due to reduction of ablation at the ice margin. In the Nastapoka Hills, ablation slowed down when the ice margin was anchored on higher relief and stood at a regional break of slope that grounded the ice margin and reduced water depth at the ice terminus, therefore, putting an end to intensive calving. In eastern James Bay and southeastern Hudson Bay, stabilization of the ice margin was caused by a reequilibrium of the ice terminus after a rapid drop of water level due to the drainage of Glacial Lake Ojibway. The new data improves the resolution of the position ice margin in eastern Hudson Bay at 8 ka BP. Article in Journal/Newspaper Hudson Bay Ice Sheet Nastapoka James Bay Canadian Science Publishing Hudson Bay Hudson Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Tyrrell ENVELOPE(-69.512,-69.512,-69.634,-69.634) Canadian Journal of Earth Sciences 40 1 65 76 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
topic |
General Earth and Planetary Sciences |
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General Earth and Planetary Sciences Lajeunesse, Patrick Allard, Michel The Nastapoka drift belt, eastern Hudson Bay: implications of a stillstand of the QuebecLabrador ice margin in the Tyrrell Sea at 8 ka BP |
topic_facet |
General Earth and Planetary Sciences |
description |
During deglaciation of eastern Hudson Bay, the western margin of the QuébecLabrador sector of the Laurentide Ice Sheet came to a stillstand about 8 14 C ka BP along the Nastapoka Hills, a series of topographic highs along the bay. These hills are the northward continuation of the eastern Hudson Bay cuesta system. It left a drift belt consisting of ice-contact submarine fans along the western slopes of the hills, small frontal moraines on hilltops, and grounding-line deposits on sills between the hills. Geomorphological, sedimentary, and radiometric evidence suggest that the stillstand responsible for deposition of the Nastapoka drift belt was either entirely or partly synchronous with the deposition of the Sakami moraine farther south. There was a period when these two morainic systems marked a continuous ice margin. These stillstands occurred due to reduction of ablation at the ice margin. In the Nastapoka Hills, ablation slowed down when the ice margin was anchored on higher relief and stood at a regional break of slope that grounded the ice margin and reduced water depth at the ice terminus, therefore, putting an end to intensive calving. In eastern James Bay and southeastern Hudson Bay, stabilization of the ice margin was caused by a reequilibrium of the ice terminus after a rapid drop of water level due to the drainage of Glacial Lake Ojibway. The new data improves the resolution of the position ice margin in eastern Hudson Bay at 8 ka BP. |
format |
Article in Journal/Newspaper |
author |
Lajeunesse, Patrick Allard, Michel |
author_facet |
Lajeunesse, Patrick Allard, Michel |
author_sort |
Lajeunesse, Patrick |
title |
The Nastapoka drift belt, eastern Hudson Bay: implications of a stillstand of the QuebecLabrador ice margin in the Tyrrell Sea at 8 ka BP |
title_short |
The Nastapoka drift belt, eastern Hudson Bay: implications of a stillstand of the QuebecLabrador ice margin in the Tyrrell Sea at 8 ka BP |
title_full |
The Nastapoka drift belt, eastern Hudson Bay: implications of a stillstand of the QuebecLabrador ice margin in the Tyrrell Sea at 8 ka BP |
title_fullStr |
The Nastapoka drift belt, eastern Hudson Bay: implications of a stillstand of the QuebecLabrador ice margin in the Tyrrell Sea at 8 ka BP |
title_full_unstemmed |
The Nastapoka drift belt, eastern Hudson Bay: implications of a stillstand of the QuebecLabrador ice margin in the Tyrrell Sea at 8 ka BP |
title_sort |
nastapoka drift belt, eastern hudson bay: implications of a stillstand of the quebeclabrador ice margin in the tyrrell sea at 8 ka bp |
publisher |
Canadian Science Publishing |
publishDate |
2003 |
url |
http://dx.doi.org/10.1139/e02-085 http://www.nrcresearchpress.com/doi/pdf/10.1139/e02-085 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) ENVELOPE(-69.512,-69.512,-69.634,-69.634) |
geographic |
Hudson Bay Hudson Glacial Lake Tyrrell |
geographic_facet |
Hudson Bay Hudson Glacial Lake Tyrrell |
genre |
Hudson Bay Ice Sheet Nastapoka James Bay |
genre_facet |
Hudson Bay Ice Sheet Nastapoka James Bay |
op_source |
Canadian Journal of Earth Sciences volume 40, issue 1, page 65-76 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e02-085 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
40 |
container_issue |
1 |
container_start_page |
65 |
op_container_end_page |
76 |
_version_ |
1795668645927452672 |