Ground-ice origin and age on Herschel Island (Qikiqtaruk), Yukon, Canada
Glacial legacies preserved in permafrost such as buried glacial ice of the last ice age are of increasing concern in the Western Canadian Arctic. Permafrost collapse due to melting ground ice largely follows the margins of the maximum Laurentide Ice Sheet extent and therefore predetermines the postg...
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ftdoajarticles:oai:doaj.org/article:c5f3dd395aac46c18ed7cb5303b8da65 2023-06-06T11:50:56+02:00 Ground-ice origin and age on Herschel Island (Qikiqtaruk), Yukon, Canada Sebastian Wetterich Alexander I. Kizyakov Thomas Opel Hendrik Grotheer Gesine Mollenhauer Michael Fritz 2023-04-01T00:00:00Z https://doi.org/10.1016/j.qsa.2023.100077 https://doaj.org/article/c5f3dd395aac46c18ed7cb5303b8da65 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2666033423000096 https://doaj.org/toc/2666-0334 2666-0334 doi:10.1016/j.qsa.2023.100077 https://doaj.org/article/c5f3dd395aac46c18ed7cb5303b8da65 Quaternary Science Advances, Vol 10, Iss , Pp 100077- (2023) Stable isotopes DOC Ice wedges Buried glacier ice Western Canadian Arctic Geography. Anthropology. Recreation G Archaeology CC1-960 article 2023 ftdoajarticles https://doi.org/10.1016/j.qsa.2023.100077 2023-04-16T00:39:16Z Glacial legacies preserved in permafrost such as buried glacial ice of the last ice age are of increasing concern in the Western Canadian Arctic. Permafrost collapse due to melting ground ice largely follows the margins of the maximum Laurentide Ice Sheet extent and therefore predetermines the postglacial landscape evolution in this region. Another type of ground ice, (i.e., wedge ice) of late Pleistocene and Holocene age associated with permafrost aggradation, is also widespread here. Our study on Herschel Island (Qikiqtaruk, Beaufort Sea) re-examines previous data and applies stable-isotope and dissolved organic carbon (DOC) analyses as well as radiocarbon dating on DOC and particulate plant macrofossil remains preserved in massive ground ice, wedge ice and host deposits.Newly obtained DOC ages of the massive ice span from 32 220 to 25 830 cal BP and extend the only previously available direct age determination (CO2-derived radiocarbon age of 21 290 cal BP) properly into the Last Glacial Maximum as the formation time of the massive ice. Its newly obtained isotopic composition exhibits mean values of −33.1 ± 0.6‰ in δ18O, of −257 ± 4‰ in δD and 7.6 ± 0.9‰ in deuterium excess (d) fitting into previously reported respective data ranges. The very low (negative) stable isotope composition of the massive ice, the numerous enclosed spherical air bubbles as well as the very low mean DOC content of 0.7 ± 0.1 mg L−1 provide strong evidence for an origin as glacier ice that was buried and has survived since deglaciation.The newly studied wedge ice on Herschel Island formed during the Holocene between 9220 and 3470 cal BP, and shows a distinct isotopic composition with mean values of −18.4 ± 1.1‰ in δ18O, −138 ± 9‰ in δD and a mean deuterium excess (d) of 8.8 ± 1.4‰. Such isotopic wedge-ice record as well as its mean DOC concentration of 4.3 ± 2.1 mg L−1 fall within the range of previously studied Holocene ice wedges in the region. The directly-dated stable isotope record of ice-wedge growth on Herschel Island indicates a ... Article in Journal/Newspaper Arctic Beaufort Sea glacier* Herschel Herschel Island Ice Ice Sheet permafrost wedge* Yukon Directory of Open Access Journals: DOAJ Articles Arctic Yukon Canada Herschel Island ENVELOPE(-139.089,-139.089,69.583,69.583) Quaternary Science Advances 10 100077 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Stable isotopes DOC Ice wedges Buried glacier ice Western Canadian Arctic Geography. Anthropology. Recreation G Archaeology CC1-960 |
spellingShingle |
Stable isotopes DOC Ice wedges Buried glacier ice Western Canadian Arctic Geography. Anthropology. Recreation G Archaeology CC1-960 Sebastian Wetterich Alexander I. Kizyakov Thomas Opel Hendrik Grotheer Gesine Mollenhauer Michael Fritz Ground-ice origin and age on Herschel Island (Qikiqtaruk), Yukon, Canada |
topic_facet |
Stable isotopes DOC Ice wedges Buried glacier ice Western Canadian Arctic Geography. Anthropology. Recreation G Archaeology CC1-960 |
description |
Glacial legacies preserved in permafrost such as buried glacial ice of the last ice age are of increasing concern in the Western Canadian Arctic. Permafrost collapse due to melting ground ice largely follows the margins of the maximum Laurentide Ice Sheet extent and therefore predetermines the postglacial landscape evolution in this region. Another type of ground ice, (i.e., wedge ice) of late Pleistocene and Holocene age associated with permafrost aggradation, is also widespread here. Our study on Herschel Island (Qikiqtaruk, Beaufort Sea) re-examines previous data and applies stable-isotope and dissolved organic carbon (DOC) analyses as well as radiocarbon dating on DOC and particulate plant macrofossil remains preserved in massive ground ice, wedge ice and host deposits.Newly obtained DOC ages of the massive ice span from 32 220 to 25 830 cal BP and extend the only previously available direct age determination (CO2-derived radiocarbon age of 21 290 cal BP) properly into the Last Glacial Maximum as the formation time of the massive ice. Its newly obtained isotopic composition exhibits mean values of −33.1 ± 0.6‰ in δ18O, of −257 ± 4‰ in δD and 7.6 ± 0.9‰ in deuterium excess (d) fitting into previously reported respective data ranges. The very low (negative) stable isotope composition of the massive ice, the numerous enclosed spherical air bubbles as well as the very low mean DOC content of 0.7 ± 0.1 mg L−1 provide strong evidence for an origin as glacier ice that was buried and has survived since deglaciation.The newly studied wedge ice on Herschel Island formed during the Holocene between 9220 and 3470 cal BP, and shows a distinct isotopic composition with mean values of −18.4 ± 1.1‰ in δ18O, −138 ± 9‰ in δD and a mean deuterium excess (d) of 8.8 ± 1.4‰. Such isotopic wedge-ice record as well as its mean DOC concentration of 4.3 ± 2.1 mg L−1 fall within the range of previously studied Holocene ice wedges in the region. The directly-dated stable isotope record of ice-wedge growth on Herschel Island indicates a ... |
format |
Article in Journal/Newspaper |
author |
Sebastian Wetterich Alexander I. Kizyakov Thomas Opel Hendrik Grotheer Gesine Mollenhauer Michael Fritz |
author_facet |
Sebastian Wetterich Alexander I. Kizyakov Thomas Opel Hendrik Grotheer Gesine Mollenhauer Michael Fritz |
author_sort |
Sebastian Wetterich |
title |
Ground-ice origin and age on Herschel Island (Qikiqtaruk), Yukon, Canada |
title_short |
Ground-ice origin and age on Herschel Island (Qikiqtaruk), Yukon, Canada |
title_full |
Ground-ice origin and age on Herschel Island (Qikiqtaruk), Yukon, Canada |
title_fullStr |
Ground-ice origin and age on Herschel Island (Qikiqtaruk), Yukon, Canada |
title_full_unstemmed |
Ground-ice origin and age on Herschel Island (Qikiqtaruk), Yukon, Canada |
title_sort |
ground-ice origin and age on herschel island (qikiqtaruk), yukon, canada |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://doi.org/10.1016/j.qsa.2023.100077 https://doaj.org/article/c5f3dd395aac46c18ed7cb5303b8da65 |
long_lat |
ENVELOPE(-139.089,-139.089,69.583,69.583) |
geographic |
Arctic Yukon Canada Herschel Island |
geographic_facet |
Arctic Yukon Canada Herschel Island |
genre |
Arctic Beaufort Sea glacier* Herschel Herschel Island Ice Ice Sheet permafrost wedge* Yukon |
genre_facet |
Arctic Beaufort Sea glacier* Herschel Herschel Island Ice Ice Sheet permafrost wedge* Yukon |
op_source |
Quaternary Science Advances, Vol 10, Iss , Pp 100077- (2023) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2666033423000096 https://doaj.org/toc/2666-0334 2666-0334 doi:10.1016/j.qsa.2023.100077 https://doaj.org/article/c5f3dd395aac46c18ed7cb5303b8da65 |
op_doi |
https://doi.org/10.1016/j.qsa.2023.100077 |
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Quaternary Science Advances |
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10 |
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100077 |
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