A note on the glacial geology and postglacial emergence of the Lake Harbour region, Baffin Island, N.W.T.
Ice-flow indicators in the Lake Harbour region of northern Hudson Strait define two flow directions affecting this area during the late Wisconsinan glaciation. A pronounced southward flow direction indicated by medium- and large-scale erosional and depositional features represents ice flow from an i...
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crcansciencepubl:10.1139/e85-197 2024-04-07T07:46:05+00:00 A note on the glacial geology and postglacial emergence of the Lake Harbour region, Baffin Island, N.W.T. Clark, Peter 1985 http://dx.doi.org/10.1139/e85-197 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-197 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 22, issue 12, page 1864-1871 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1985 crcansciencepubl https://doi.org/10.1139/e85-197 2024-03-08T00:37:41Z Ice-flow indicators in the Lake Harbour region of northern Hudson Strait define two flow directions affecting this area during the late Wisconsinan glaciation. A pronounced southward flow direction indicated by medium- and large-scale erosional and depositional features represents ice flow from an ice dome centered to the north, perhaps Foxe Basin and (or) Amadjuak Lake. Carbonate-rich till and striations represent eastward–southeastward ice flow down the axis of Hudson Strait. Convergence of ice-sheet flow with a rapidly moving ice stream has been observed and modelled for West Antarctic ice streams and involves sharp bending of flow lines at the point of convergence. A similar scenario is proposed for the Lake Harbour region to explain the two contrasting ice-flow patterns. Impingement of an ice stream in Hudson Strait onto the southern coast of Baffin Island suggests the influence of northerly flowing ice, perhaps from the Ungava plateau.Radiocarbon dates on marine shells and archeological samples are used to reconstruct the postglacial emergence of the Lake Harbour region. The marine limit (90 m aht) and deglaciation are dated by extrapolation at ca. 8300 years BP. Postglacial emergence is characterized by an initial uplift rate of 4.4 m/100 years, which decreased to 0.2 m/100 years over the last 3900 years. The initial rate (4.4 m/100 years) is nearly 50% lower than rates calculated elsewhere in the Hudson Strait region and is interpreted to reflect the influence of an ice load centered over Amadjuak Lake directly north of the Lake Harbour region. Article in Journal/Newspaper Amadjuak Lake Antarc* Antarctic Baffin Island Baffin Foxe Basin Hudson Strait Ice Sheet Canadian Science Publishing Antarctic Baffin Island Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Foxe Basin ENVELOPE(-77.918,-77.918,65.931,65.931) Lake Harbour ENVELOPE(-69.848,-69.848,62.834,62.834) Amadjuak ENVELOPE(-72.648,-72.648,64.017,64.017) Amadjuak Lake ENVELOPE(-71.133,-71.133,64.917,64.917) Canadian Journal of Earth Sciences 22 12 1864 1871 |
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Open Polar |
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Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Clark, Peter A note on the glacial geology and postglacial emergence of the Lake Harbour region, Baffin Island, N.W.T. |
topic_facet |
General Earth and Planetary Sciences |
description |
Ice-flow indicators in the Lake Harbour region of northern Hudson Strait define two flow directions affecting this area during the late Wisconsinan glaciation. A pronounced southward flow direction indicated by medium- and large-scale erosional and depositional features represents ice flow from an ice dome centered to the north, perhaps Foxe Basin and (or) Amadjuak Lake. Carbonate-rich till and striations represent eastward–southeastward ice flow down the axis of Hudson Strait. Convergence of ice-sheet flow with a rapidly moving ice stream has been observed and modelled for West Antarctic ice streams and involves sharp bending of flow lines at the point of convergence. A similar scenario is proposed for the Lake Harbour region to explain the two contrasting ice-flow patterns. Impingement of an ice stream in Hudson Strait onto the southern coast of Baffin Island suggests the influence of northerly flowing ice, perhaps from the Ungava plateau.Radiocarbon dates on marine shells and archeological samples are used to reconstruct the postglacial emergence of the Lake Harbour region. The marine limit (90 m aht) and deglaciation are dated by extrapolation at ca. 8300 years BP. Postglacial emergence is characterized by an initial uplift rate of 4.4 m/100 years, which decreased to 0.2 m/100 years over the last 3900 years. The initial rate (4.4 m/100 years) is nearly 50% lower than rates calculated elsewhere in the Hudson Strait region and is interpreted to reflect the influence of an ice load centered over Amadjuak Lake directly north of the Lake Harbour region. |
format |
Article in Journal/Newspaper |
author |
Clark, Peter |
author_facet |
Clark, Peter |
author_sort |
Clark, Peter |
title |
A note on the glacial geology and postglacial emergence of the Lake Harbour region, Baffin Island, N.W.T. |
title_short |
A note on the glacial geology and postglacial emergence of the Lake Harbour region, Baffin Island, N.W.T. |
title_full |
A note on the glacial geology and postglacial emergence of the Lake Harbour region, Baffin Island, N.W.T. |
title_fullStr |
A note on the glacial geology and postglacial emergence of the Lake Harbour region, Baffin Island, N.W.T. |
title_full_unstemmed |
A note on the glacial geology and postglacial emergence of the Lake Harbour region, Baffin Island, N.W.T. |
title_sort |
note on the glacial geology and postglacial emergence of the lake harbour region, baffin island, n.w.t. |
publisher |
Canadian Science Publishing |
publishDate |
1985 |
url |
http://dx.doi.org/10.1139/e85-197 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-197 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) ENVELOPE(-77.918,-77.918,65.931,65.931) ENVELOPE(-69.848,-69.848,62.834,62.834) ENVELOPE(-72.648,-72.648,64.017,64.017) ENVELOPE(-71.133,-71.133,64.917,64.917) |
geographic |
Antarctic Baffin Island Hudson Hudson Strait Foxe Basin Lake Harbour Amadjuak Amadjuak Lake |
geographic_facet |
Antarctic Baffin Island Hudson Hudson Strait Foxe Basin Lake Harbour Amadjuak Amadjuak Lake |
genre |
Amadjuak Lake Antarc* Antarctic Baffin Island Baffin Foxe Basin Hudson Strait Ice Sheet |
genre_facet |
Amadjuak Lake Antarc* Antarctic Baffin Island Baffin Foxe Basin Hudson Strait Ice Sheet |
op_source |
Canadian Journal of Earth Sciences volume 22, issue 12, page 1864-1871 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e85-197 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
22 |
container_issue |
12 |
container_start_page |
1864 |
op_container_end_page |
1871 |
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1795662546107105280 |