Late Wisconsinan erosion and eolian deposition, Summer Island area, Pleistocene Mackenzie Delta, Northwest Territories: optical dating and implications for glacial chronology
The Summer Island area of the Pleistocene Mackenzie Delta, western Canadian Arctic, is thought to have been last glaciated during the Early Wisconsinan (>35 ka), with a suggested Late Wisconsinan (~13 ka) glacial limit located ~80–100 km to the south. Cryostratigraphic observations in the Summer...
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Canadian Science Publishing
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crcansciencepubl:10.1139/e17-015 2024-09-09T19:25:34+00:00 Late Wisconsinan erosion and eolian deposition, Summer Island area, Pleistocene Mackenzie Delta, Northwest Territories: optical dating and implications for glacial chronology Murton, Julian B. French, Hugh M. Lamothe, Michel 1997 http://dx.doi.org/10.1139/e17-015 http://www.nrcresearchpress.com/doi/pdf/10.1139/e17-015 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 34, issue 2, page 190-199 ISSN 0008-4077 1480-3313 journal-article 1997 crcansciencepubl https://doi.org/10.1139/e17-015 2024-07-04T04:10:00Z The Summer Island area of the Pleistocene Mackenzie Delta, western Canadian Arctic, is thought to have been last glaciated during the Early Wisconsinan (>35 ka), with a suggested Late Wisconsinan (~13 ka) glacial limit located ~80–100 km to the south. Cryostratigraphic observations in the Summer Island area identify eolian and fluvial sediments overlying an erosion surface. On Summer Island, eolian sand occurs within sand wedges, the tops of which are contiguous with an eolian sand sheet deposited on a formerly bare ice surface. This paleo-ice surface is attributed to fluvial erosion, and that in turn is attributed to proglacial meltwater activity. The age of erosion is inferred to be shortly before ~14 ka, determined by optical dating (using infrared stimulation of luminescence from feldspar) of the eolian sand wedges. This ~14 ka meltwater erosion is significantly north of the generally accepted limit of Late Wisconsinan glaciation in this coastal area, suggesting that ice last covered the whole of Richards Island near the end of the Late Wisconsinan, rather than in the Early Wisconsinan, as previously thought. Article in Journal/Newspaper Arctic Mackenzie Delta Northwest Territories Richards Island Canadian Science Publishing Arctic Northwest Territories Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Summer Island ENVELOPE(-133.906,-133.906,69.583,69.583) Canadian Journal of Earth Sciences 34 2 190 199 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The Summer Island area of the Pleistocene Mackenzie Delta, western Canadian Arctic, is thought to have been last glaciated during the Early Wisconsinan (>35 ka), with a suggested Late Wisconsinan (~13 ka) glacial limit located ~80–100 km to the south. Cryostratigraphic observations in the Summer Island area identify eolian and fluvial sediments overlying an erosion surface. On Summer Island, eolian sand occurs within sand wedges, the tops of which are contiguous with an eolian sand sheet deposited on a formerly bare ice surface. This paleo-ice surface is attributed to fluvial erosion, and that in turn is attributed to proglacial meltwater activity. The age of erosion is inferred to be shortly before ~14 ka, determined by optical dating (using infrared stimulation of luminescence from feldspar) of the eolian sand wedges. This ~14 ka meltwater erosion is significantly north of the generally accepted limit of Late Wisconsinan glaciation in this coastal area, suggesting that ice last covered the whole of Richards Island near the end of the Late Wisconsinan, rather than in the Early Wisconsinan, as previously thought. |
format |
Article in Journal/Newspaper |
author |
Murton, Julian B. French, Hugh M. Lamothe, Michel |
spellingShingle |
Murton, Julian B. French, Hugh M. Lamothe, Michel Late Wisconsinan erosion and eolian deposition, Summer Island area, Pleistocene Mackenzie Delta, Northwest Territories: optical dating and implications for glacial chronology |
author_facet |
Murton, Julian B. French, Hugh M. Lamothe, Michel |
author_sort |
Murton, Julian B. |
title |
Late Wisconsinan erosion and eolian deposition, Summer Island area, Pleistocene Mackenzie Delta, Northwest Territories: optical dating and implications for glacial chronology |
title_short |
Late Wisconsinan erosion and eolian deposition, Summer Island area, Pleistocene Mackenzie Delta, Northwest Territories: optical dating and implications for glacial chronology |
title_full |
Late Wisconsinan erosion and eolian deposition, Summer Island area, Pleistocene Mackenzie Delta, Northwest Territories: optical dating and implications for glacial chronology |
title_fullStr |
Late Wisconsinan erosion and eolian deposition, Summer Island area, Pleistocene Mackenzie Delta, Northwest Territories: optical dating and implications for glacial chronology |
title_full_unstemmed |
Late Wisconsinan erosion and eolian deposition, Summer Island area, Pleistocene Mackenzie Delta, Northwest Territories: optical dating and implications for glacial chronology |
title_sort |
late wisconsinan erosion and eolian deposition, summer island area, pleistocene mackenzie delta, northwest territories: optical dating and implications for glacial chronology |
publisher |
Canadian Science Publishing |
publishDate |
1997 |
url |
http://dx.doi.org/10.1139/e17-015 http://www.nrcresearchpress.com/doi/pdf/10.1139/e17-015 |
long_lat |
ENVELOPE(-136.672,-136.672,68.833,68.833) ENVELOPE(-133.906,-133.906,69.583,69.583) |
geographic |
Arctic Northwest Territories Mackenzie Delta Summer Island |
geographic_facet |
Arctic Northwest Territories Mackenzie Delta Summer Island |
genre |
Arctic Mackenzie Delta Northwest Territories Richards Island |
genre_facet |
Arctic Mackenzie Delta Northwest Territories Richards Island |
op_source |
Canadian Journal of Earth Sciences volume 34, issue 2, page 190-199 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e17-015 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
34 |
container_issue |
2 |
container_start_page |
190 |
op_container_end_page |
199 |
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1809895334454755328 |