Massive ice of the Tuktoyaktuk area, western Arctic coast, Canada
The extensive coastal exposure of massive underground ice at Peninsula Point, southwest of Tuktoyaktuk, Northwest Territories, is believed to be intrasedimental ice. The ice grew beneath a frozen diamicton during the downward aggradation of permafrost. The water source was probably glacier meltwater...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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1992
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Online Access: | http://dx.doi.org/10.1139/e92-099 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-099 |
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crcansciencepubl:10.1139/e92-099 2024-09-09T19:25:58+00:00 Massive ice of the Tuktoyaktuk area, western Arctic coast, Canada Mackay, J. Ross Dallimore, Scott R. 1992 http://dx.doi.org/10.1139/e92-099 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-099 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 29, issue 6, page 1235-1249 ISSN 0008-4077 1480-3313 journal-article 1992 crcansciencepubl https://doi.org/10.1139/e92-099 2024-08-22T04:08:45Z The extensive coastal exposure of massive underground ice at Peninsula Point, southwest of Tuktoyaktuk, Northwest Territories, is believed to be intrasedimental ice. The ice grew beneath a frozen diamicton during the downward aggradation of permafrost. The water source was probably glacier meltwater, with low negative δ 18 O values, that flowed, under a substantial pressure, through permeable unfrozen sands. Evidence for a high water pressure is shown by ice dikes, which extend upward from the massive ice into the superincumbent diamicton. The diamicton was frozen when the dike water was injected, as proven by the chill contacts and petrofabrics. The diamicton – massive ice contact is a conformable contact with features characteristic of downward freezing. The continuity of δ 18 O and δD profiles from the top of the massive ice downward to a depth of 10 m into the underlying frozen sand demonstrates a common water source for the massive ice and interstitial ice in the underlying sand. A similar continuity of δ 18 O profiles has been determined from three drill holes at another site 15 km northeast of Tuktoyaktuk, Northwest Territories. The ages of both the diamicton and massive ice at the Peninsula Point site are uncertain, because of unexplained differences in published radiocarbon dates. Article in Journal/Newspaper Arctic glacier* Ice Northwest Territories permafrost Tuktoyaktuk Canadian Science Publishing Arctic Northwest Territories Canada Tuktoyaktuk ENVELOPE(-133.006,-133.006,69.425,69.425) Canadian Journal of Earth Sciences 29 6 1235 1249 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The extensive coastal exposure of massive underground ice at Peninsula Point, southwest of Tuktoyaktuk, Northwest Territories, is believed to be intrasedimental ice. The ice grew beneath a frozen diamicton during the downward aggradation of permafrost. The water source was probably glacier meltwater, with low negative δ 18 O values, that flowed, under a substantial pressure, through permeable unfrozen sands. Evidence for a high water pressure is shown by ice dikes, which extend upward from the massive ice into the superincumbent diamicton. The diamicton was frozen when the dike water was injected, as proven by the chill contacts and petrofabrics. The diamicton – massive ice contact is a conformable contact with features characteristic of downward freezing. The continuity of δ 18 O and δD profiles from the top of the massive ice downward to a depth of 10 m into the underlying frozen sand demonstrates a common water source for the massive ice and interstitial ice in the underlying sand. A similar continuity of δ 18 O profiles has been determined from three drill holes at another site 15 km northeast of Tuktoyaktuk, Northwest Territories. The ages of both the diamicton and massive ice at the Peninsula Point site are uncertain, because of unexplained differences in published radiocarbon dates. |
format |
Article in Journal/Newspaper |
author |
Mackay, J. Ross Dallimore, Scott R. |
spellingShingle |
Mackay, J. Ross Dallimore, Scott R. Massive ice of the Tuktoyaktuk area, western Arctic coast, Canada |
author_facet |
Mackay, J. Ross Dallimore, Scott R. |
author_sort |
Mackay, J. Ross |
title |
Massive ice of the Tuktoyaktuk area, western Arctic coast, Canada |
title_short |
Massive ice of the Tuktoyaktuk area, western Arctic coast, Canada |
title_full |
Massive ice of the Tuktoyaktuk area, western Arctic coast, Canada |
title_fullStr |
Massive ice of the Tuktoyaktuk area, western Arctic coast, Canada |
title_full_unstemmed |
Massive ice of the Tuktoyaktuk area, western Arctic coast, Canada |
title_sort |
massive ice of the tuktoyaktuk area, western arctic coast, canada |
publisher |
Canadian Science Publishing |
publishDate |
1992 |
url |
http://dx.doi.org/10.1139/e92-099 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-099 |
long_lat |
ENVELOPE(-133.006,-133.006,69.425,69.425) |
geographic |
Arctic Northwest Territories Canada Tuktoyaktuk |
geographic_facet |
Arctic Northwest Territories Canada Tuktoyaktuk |
genre |
Arctic glacier* Ice Northwest Territories permafrost Tuktoyaktuk |
genre_facet |
Arctic glacier* Ice Northwest Territories permafrost Tuktoyaktuk |
op_source |
Canadian Journal of Earth Sciences volume 29, issue 6, page 1235-1249 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e92-099 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
29 |
container_issue |
6 |
container_start_page |
1235 |
op_container_end_page |
1249 |
_version_ |
1809895693370785792 |