Evidence for a 55–50 ka (early Wisconsin) glaciation of the Cordilleran ice sheet, Yukon Territory, Canada
Abstract Cosmogenic 10 Be ages on boulders of 54–51 ka ( n =4) on a penultimate Cordilleran ice sheet (CIS) drift confirm that Marine Oxygen Isotope Stage (MIS) 4 (early Wisconsin) glaciation was extensive in parts of Yukon Territory, the first confirmed evidence in the Canadian Cordillera. We name...
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crcambridgeupr:10.1016/j.yqres.2007.04.002 2024-09-15T17:36:28+00:00 Evidence for a 55–50 ka (early Wisconsin) glaciation of the Cordilleran ice sheet, Yukon Territory, Canada Ward, Brent C. Bond, Jeffrey D. Gosse, John C. 2007 http://dx.doi.org/10.1016/j.yqres.2007.04.002 http://api.elsevier.com/content/article/PII:S0033589407000634?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589407000634?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400014046 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 68, issue 1, page 141-150 ISSN 0033-5894 1096-0287 journal-article 2007 crcambridgeupr https://doi.org/10.1016/j.yqres.2007.04.002 2024-07-31T04:04:09Z Abstract Cosmogenic 10 Be ages on boulders of 54–51 ka ( n =4) on a penultimate Cordilleran ice sheet (CIS) drift confirm that Marine Oxygen Isotope Stage (MIS) 4 (early Wisconsin) glaciation was extensive in parts of Yukon Territory, the first confirmed evidence in the Canadian Cordillera. We name the glaciation inferred from the mapped and dated drift the Gladstone. These results are in apparent contrast to the MIS 6 (Illinoian) age of the penultimate Reid glaciation to the east in central Yukon but are equivalent to exposure ages on MIS 4 drift in Alaska. Contrasting penultimate ice extents in Yukon requires that different source areas of the northern CIS in Yukon responded differently to climatic forcing during glaciations. The variation in glacier extent for different source areas likely relates to variation in precipitation during glaciation, as the northern CIS was a precipitation-limited system. Causes for a variation in precipitation remain unclear but likely involve the style of precipitation delivery over the St. Elias Mountains possibly related to variations in the Aleutian low. Article in Journal/Newspaper aleutian low glacier glacier* Ice Sheet Alaska Yukon Cambridge University Press Quaternary Research 68 1 141 150 |
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Cambridge University Press |
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English |
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Abstract Cosmogenic 10 Be ages on boulders of 54–51 ka ( n =4) on a penultimate Cordilleran ice sheet (CIS) drift confirm that Marine Oxygen Isotope Stage (MIS) 4 (early Wisconsin) glaciation was extensive in parts of Yukon Territory, the first confirmed evidence in the Canadian Cordillera. We name the glaciation inferred from the mapped and dated drift the Gladstone. These results are in apparent contrast to the MIS 6 (Illinoian) age of the penultimate Reid glaciation to the east in central Yukon but are equivalent to exposure ages on MIS 4 drift in Alaska. Contrasting penultimate ice extents in Yukon requires that different source areas of the northern CIS in Yukon responded differently to climatic forcing during glaciations. The variation in glacier extent for different source areas likely relates to variation in precipitation during glaciation, as the northern CIS was a precipitation-limited system. Causes for a variation in precipitation remain unclear but likely involve the style of precipitation delivery over the St. Elias Mountains possibly related to variations in the Aleutian low. |
format |
Article in Journal/Newspaper |
author |
Ward, Brent C. Bond, Jeffrey D. Gosse, John C. |
spellingShingle |
Ward, Brent C. Bond, Jeffrey D. Gosse, John C. Evidence for a 55–50 ka (early Wisconsin) glaciation of the Cordilleran ice sheet, Yukon Territory, Canada |
author_facet |
Ward, Brent C. Bond, Jeffrey D. Gosse, John C. |
author_sort |
Ward, Brent C. |
title |
Evidence for a 55–50 ka (early Wisconsin) glaciation of the Cordilleran ice sheet, Yukon Territory, Canada |
title_short |
Evidence for a 55–50 ka (early Wisconsin) glaciation of the Cordilleran ice sheet, Yukon Territory, Canada |
title_full |
Evidence for a 55–50 ka (early Wisconsin) glaciation of the Cordilleran ice sheet, Yukon Territory, Canada |
title_fullStr |
Evidence for a 55–50 ka (early Wisconsin) glaciation of the Cordilleran ice sheet, Yukon Territory, Canada |
title_full_unstemmed |
Evidence for a 55–50 ka (early Wisconsin) glaciation of the Cordilleran ice sheet, Yukon Territory, Canada |
title_sort |
evidence for a 55–50 ka (early wisconsin) glaciation of the cordilleran ice sheet, yukon territory, canada |
publisher |
Cambridge University Press (CUP) |
publishDate |
2007 |
url |
http://dx.doi.org/10.1016/j.yqres.2007.04.002 http://api.elsevier.com/content/article/PII:S0033589407000634?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589407000634?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400014046 |
genre |
aleutian low glacier glacier* Ice Sheet Alaska Yukon |
genre_facet |
aleutian low glacier glacier* Ice Sheet Alaska Yukon |
op_source |
Quaternary Research volume 68, issue 1, page 141-150 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2007.04.002 |
container_title |
Quaternary Research |
container_volume |
68 |
container_issue |
1 |
container_start_page |
141 |
op_container_end_page |
150 |
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1810489791923355648 |