Geomorphic origin of a lithalsa in the Great Slave Lowlands, Northwest Territories, Canada
Lithalsas, mineral-based permafrost mounds with segregated ice in their cores, are found in the Great Slave Lowlands, Northwest Territories. They are formed in (glacio)lacustrine deposits of Glacial Lake McConnell and ancestral Great Slave Lake left as water levels receded during the Holocene to the...
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ftcarletonuniv:oai:curve.carleton.ca:18907 2023-05-15T16:23:05+02:00 Geomorphic origin of a lithalsa in the Great Slave Lowlands, Northwest Territories, Canada Gaanderse, Adrian 2015 https://curve.carleton.ca/34740a71-45a3-4862-9f4c-eabeb883cac6 https://catalogue.library.carleton.ca/record=b3787533 https://doi.org/10.22215/etd/2015-10857 unknown https://curve.carleton.ca/34740a71-45a3-4862-9f4c-eabeb883cac6 https://catalogue.library.carleton.ca/record=b3787533 https://doi.org/10.22215/etd/2015-10857 Thesis/Dissertation 2015 ftcarletonuniv https://doi.org/10.22215/etd/2015-10857 2022-01-23T08:21:48Z Lithalsas, mineral-based permafrost mounds with segregated ice in their cores, are found in the Great Slave Lowlands, Northwest Territories. They are formed in (glacio)lacustrine deposits of Glacial Lake McConnell and ancestral Great Slave Lake left as water levels receded during the Holocene to the present level of Great Slave Lake. Ground ice conditions were examined in one 700-m long lithalsa adjacent to Highway 3, 30 km west of Yellowknife. Samples obtained to depths of 8.4 m from 17 boreholes revealed domed layers of silts, sands, and clays in the lithalsa, with related layers appearing horizontally beneath an adjacent peatland. Segregated ice lenses over 0.1 m thick occurred in clays below 4 m depth. δ18O values of lithalsa ice indicate modern water sources for the ground ice. The ages of organic material recovered from the lithalsa imply permafrost aggradation initiated growth of the feature within the last 700 to 400 years. Thesis Great Slave Lake Ice Northwest Territories permafrost Yellowknife CURVE - Carleton University Research Virtual Environment Northwest Territories Yellowknife Canada Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Great Slave Lake ENVELOPE(-114.001,-114.001,61.500,61.500) |
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Open Polar |
collection |
CURVE - Carleton University Research Virtual Environment |
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ftcarletonuniv |
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unknown |
description |
Lithalsas, mineral-based permafrost mounds with segregated ice in their cores, are found in the Great Slave Lowlands, Northwest Territories. They are formed in (glacio)lacustrine deposits of Glacial Lake McConnell and ancestral Great Slave Lake left as water levels receded during the Holocene to the present level of Great Slave Lake. Ground ice conditions were examined in one 700-m long lithalsa adjacent to Highway 3, 30 km west of Yellowknife. Samples obtained to depths of 8.4 m from 17 boreholes revealed domed layers of silts, sands, and clays in the lithalsa, with related layers appearing horizontally beneath an adjacent peatland. Segregated ice lenses over 0.1 m thick occurred in clays below 4 m depth. δ18O values of lithalsa ice indicate modern water sources for the ground ice. The ages of organic material recovered from the lithalsa imply permafrost aggradation initiated growth of the feature within the last 700 to 400 years. |
format |
Thesis |
author |
Gaanderse, Adrian |
spellingShingle |
Gaanderse, Adrian Geomorphic origin of a lithalsa in the Great Slave Lowlands, Northwest Territories, Canada |
author_facet |
Gaanderse, Adrian |
author_sort |
Gaanderse, Adrian |
title |
Geomorphic origin of a lithalsa in the Great Slave Lowlands, Northwest Territories, Canada |
title_short |
Geomorphic origin of a lithalsa in the Great Slave Lowlands, Northwest Territories, Canada |
title_full |
Geomorphic origin of a lithalsa in the Great Slave Lowlands, Northwest Territories, Canada |
title_fullStr |
Geomorphic origin of a lithalsa in the Great Slave Lowlands, Northwest Territories, Canada |
title_full_unstemmed |
Geomorphic origin of a lithalsa in the Great Slave Lowlands, Northwest Territories, Canada |
title_sort |
geomorphic origin of a lithalsa in the great slave lowlands, northwest territories, canada |
publishDate |
2015 |
url |
https://curve.carleton.ca/34740a71-45a3-4862-9f4c-eabeb883cac6 https://catalogue.library.carleton.ca/record=b3787533 https://doi.org/10.22215/etd/2015-10857 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) ENVELOPE(-114.001,-114.001,61.500,61.500) |
geographic |
Northwest Territories Yellowknife Canada Glacial Lake Great Slave Lake |
geographic_facet |
Northwest Territories Yellowknife Canada Glacial Lake Great Slave Lake |
genre |
Great Slave Lake Ice Northwest Territories permafrost Yellowknife |
genre_facet |
Great Slave Lake Ice Northwest Territories permafrost Yellowknife |
op_relation |
https://curve.carleton.ca/34740a71-45a3-4862-9f4c-eabeb883cac6 https://catalogue.library.carleton.ca/record=b3787533 https://doi.org/10.22215/etd/2015-10857 |
op_doi |
https://doi.org/10.22215/etd/2015-10857 |
_version_ |
1766011261739335680 |