Nature and origin of a Pleistocene-age massive ground-ice body exposed in the Chapman Lake moraine Complex, central Yukon Territory, Canada
Abstract A massive ground-ice body was found exposed in the headwall of a thaw flow developed within the Chapman Lake terminal moraine complex on the Blackstone Plateau (Ogilvie Mountains, central Yukon Territory), which is contemporaneous to the Reid glaciation. Based on visible cryostructures in t...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1016/j.yqres.2007.05.002 2024-06-16T07:40:12+00:00 Nature and origin of a Pleistocene-age massive ground-ice body exposed in the Chapman Lake moraine Complex, central Yukon Territory, Canada Lacelle, Denis Lauriol, Bernard Clark, Ian D. Cardyn, Raphaelle Zdanowicz, Christian 2007 http://dx.doi.org/10.1016/j.yqres.2007.05.002 http://api.elsevier.com/content/article/PII:S0033589407000683?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589407000683?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400014186 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 68, issue 2, page 249-260 ISSN 0033-5894 1096-0287 journal-article 2007 crcambridgeupr https://doi.org/10.1016/j.yqres.2007.05.002 2024-05-22T12:55:54Z Abstract A massive ground-ice body was found exposed in the headwall of a thaw flow developed within the Chapman Lake terminal moraine complex on the Blackstone Plateau (Ogilvie Mountains, central Yukon Territory), which is contemporaneous to the Reid glaciation. Based on visible cryostructures in the 4-m-high headwall, two units were identified: massive ground ice, overlain sharply by 2 m of icy diamicton. The nature and origin of the Chapman Lake massive ground ice was determined using cryostratigraphy, petrography, stable O–H isotopes and the molar concentration of occluded gases (CO 2 , O 2 , N 2 and Ar) entrapped in the ice, a new technique in the field of periglacial geomorphology that allows to distinguish between glacial and non-glacial intrasedimental ice. Collectively, the results indicate that the Chapman Lake massive ground ice formed by firn densification with limited melting–refreezing and underwent deformation near its margin. Given that the massive ground-ice body consists of relict glacier ice, it suggests that permafrost persisted, at least locally, on plateau areas in the central Yukon Territory since the middle Pleistocene. In addition, the d value of Chapman Lake relict glacier ice suggests that the ice covering the area during the Reid glaciation originated from a local alpine glaciation in the Ogilvie Mountains. Article in Journal/Newspaper glacier* Ice Ogilvie Mountains permafrost Yukon Cambridge University Press Yukon Canada Ogilvie ENVELOPE(-139.746,-139.746,63.563,63.563) Ogilvie Mountains ENVELOPE(-138.254,-138.254,64.583,64.583) Blackstone Plateau ENVELOPE(-138.504,-138.504,64.783,64.783) Chapman Lake ENVELOPE(162.383,162.383,-77.017,-77.017) Quaternary Research 68 2 249 260 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract A massive ground-ice body was found exposed in the headwall of a thaw flow developed within the Chapman Lake terminal moraine complex on the Blackstone Plateau (Ogilvie Mountains, central Yukon Territory), which is contemporaneous to the Reid glaciation. Based on visible cryostructures in the 4-m-high headwall, two units were identified: massive ground ice, overlain sharply by 2 m of icy diamicton. The nature and origin of the Chapman Lake massive ground ice was determined using cryostratigraphy, petrography, stable O–H isotopes and the molar concentration of occluded gases (CO 2 , O 2 , N 2 and Ar) entrapped in the ice, a new technique in the field of periglacial geomorphology that allows to distinguish between glacial and non-glacial intrasedimental ice. Collectively, the results indicate that the Chapman Lake massive ground ice formed by firn densification with limited melting–refreezing and underwent deformation near its margin. Given that the massive ground-ice body consists of relict glacier ice, it suggests that permafrost persisted, at least locally, on plateau areas in the central Yukon Territory since the middle Pleistocene. In addition, the d value of Chapman Lake relict glacier ice suggests that the ice covering the area during the Reid glaciation originated from a local alpine glaciation in the Ogilvie Mountains. |
format |
Article in Journal/Newspaper |
author |
Lacelle, Denis Lauriol, Bernard Clark, Ian D. Cardyn, Raphaelle Zdanowicz, Christian |
spellingShingle |
Lacelle, Denis Lauriol, Bernard Clark, Ian D. Cardyn, Raphaelle Zdanowicz, Christian Nature and origin of a Pleistocene-age massive ground-ice body exposed in the Chapman Lake moraine Complex, central Yukon Territory, Canada |
author_facet |
Lacelle, Denis Lauriol, Bernard Clark, Ian D. Cardyn, Raphaelle Zdanowicz, Christian |
author_sort |
Lacelle, Denis |
title |
Nature and origin of a Pleistocene-age massive ground-ice body exposed in the Chapman Lake moraine Complex, central Yukon Territory, Canada |
title_short |
Nature and origin of a Pleistocene-age massive ground-ice body exposed in the Chapman Lake moraine Complex, central Yukon Territory, Canada |
title_full |
Nature and origin of a Pleistocene-age massive ground-ice body exposed in the Chapman Lake moraine Complex, central Yukon Territory, Canada |
title_fullStr |
Nature and origin of a Pleistocene-age massive ground-ice body exposed in the Chapman Lake moraine Complex, central Yukon Territory, Canada |
title_full_unstemmed |
Nature and origin of a Pleistocene-age massive ground-ice body exposed in the Chapman Lake moraine Complex, central Yukon Territory, Canada |
title_sort |
nature and origin of a pleistocene-age massive ground-ice body exposed in the chapman lake moraine complex, central yukon territory, canada |
publisher |
Cambridge University Press (CUP) |
publishDate |
2007 |
url |
http://dx.doi.org/10.1016/j.yqres.2007.05.002 http://api.elsevier.com/content/article/PII:S0033589407000683?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589407000683?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400014186 |
long_lat |
ENVELOPE(-139.746,-139.746,63.563,63.563) ENVELOPE(-138.254,-138.254,64.583,64.583) ENVELOPE(-138.504,-138.504,64.783,64.783) ENVELOPE(162.383,162.383,-77.017,-77.017) |
geographic |
Yukon Canada Ogilvie Ogilvie Mountains Blackstone Plateau Chapman Lake |
geographic_facet |
Yukon Canada Ogilvie Ogilvie Mountains Blackstone Plateau Chapman Lake |
genre |
glacier* Ice Ogilvie Mountains permafrost Yukon |
genre_facet |
glacier* Ice Ogilvie Mountains permafrost Yukon |
op_source |
Quaternary Research volume 68, issue 2, page 249-260 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2007.05.002 |
container_title |
Quaternary Research |
container_volume |
68 |
container_issue |
2 |
container_start_page |
249 |
op_container_end_page |
260 |
_version_ |
1802007055854206976 |