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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ftzenodo:oai:zenodo.org:10144009 2024-09-15T17:58:50+00:00 Ground-ice origin and age on Herschel Island (Qikiqtaruk), Yukon, Canada Wetterich, Sebastian Kizyakov, Alexander I. Opel, Thomas Grotheer, Hendrik Mollenhauer, Gesine Fritz, Michael 2023-04 https://doi.org/10.1016/j.qsa.2023.100077 https://www.sciencedirect.com/science/article/pii/S2666033423000096 unknown Zenodo https://zenodo.org/communities/nunataryuk https://zenodo.org/communities/eu https://doi.org/10.1016/j.qsa.2023.100077 oai:zenodo.org:10144009 https://www.sciencedirect.com/science/article/pii/S2666033423000096 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode Quaternary Science Advances, 10, (2023-04) info:eu-repo/semantics/article 2023 ftzenodo https://doi.org/10.1016/j.qsa.2023.100077 2024-07-27T04:41:51Z 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 ... Article in Journal/Newspaper Beaufort Sea glacier* Herschel Herschel Island Ice Ice Sheet permafrost wedge* Yukon Zenodo Quaternary Science Advances 10 100077 |
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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 ... |
format |
Article in Journal/Newspaper |
author |
Wetterich, Sebastian Kizyakov, Alexander I. Opel, Thomas Grotheer, Hendrik Mollenhauer, Gesine Fritz, Michael |
spellingShingle |
Wetterich, Sebastian Kizyakov, Alexander I. Opel, Thomas Grotheer, Hendrik Mollenhauer, Gesine Fritz, Michael Ground-ice origin and age on Herschel Island (Qikiqtaruk), Yukon, Canada |
author_facet |
Wetterich, Sebastian Kizyakov, Alexander I. Opel, Thomas Grotheer, Hendrik Mollenhauer, Gesine Fritz, Michael |
author_sort |
Wetterich, Sebastian |
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 |
Zenodo |
publishDate |
2023 |
url |
https://doi.org/10.1016/j.qsa.2023.100077 https://www.sciencedirect.com/science/article/pii/S2666033423000096 |
genre |
Beaufort Sea glacier* Herschel Herschel Island Ice Ice Sheet permafrost wedge* Yukon |
genre_facet |
Beaufort Sea glacier* Herschel Herschel Island Ice Ice Sheet permafrost wedge* Yukon |
op_source |
Quaternary Science Advances, 10, (2023-04) |
op_relation |
https://zenodo.org/communities/nunataryuk https://zenodo.org/communities/eu https://doi.org/10.1016/j.qsa.2023.100077 oai:zenodo.org:10144009 https://www.sciencedirect.com/science/article/pii/S2666033423000096 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.1016/j.qsa.2023.100077 |
container_title |
Quaternary Science Advances |
container_volume |
10 |
container_start_page |
100077 |
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1810435803277426688 |