Eruption of Mount Meager, British Columbia, during the early Fraser glaciation
A new 40 Ar/ 39 Ar date from a pyroclastic density current deposit preserved on the northern slopes of the Lillooet River valley, British Columbia, indicates an explosive volcanic eruption of the Mount Meager Volcanic Complex (MMVC) at 24.3 ± 2.3 ka. The age of this pyroclastic deposit is a record o...
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crcansciencepubl:10.1139/cjes-2021-0023 2024-06-23T07:53:46+00:00 Eruption of Mount Meager, British Columbia, during the early Fraser glaciation Russell, James K. Stewart, Martin Wilson, Alex Williams-Jones, Glyn 2021 http://dx.doi.org/10.1139/cjes-2021-0023 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2021-0023 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2021-0023 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 58, issue 10, page 1146-1154 ISSN 0008-4077 1480-3313 journal-article 2021 crcansciencepubl https://doi.org/10.1139/cjes-2021-0023 2024-06-06T04:11:19Z A new 40 Ar/ 39 Ar date from a pyroclastic density current deposit preserved on the northern slopes of the Lillooet River valley, British Columbia, indicates an explosive volcanic eruption of the Mount Meager Volcanic Complex (MMVC) at 24.3 ± 2.3 ka. The age of this pyroclastic deposit is a record of the second youngest explosive volcanic event for the MMVC and indicates that Mount Meager has erupted, explosively, at least twice in the past ∼25 000 years. The age of the volcanic eruption coincides with the early phase of growth of the late Wisconsin (Fraser) Cordilleran ice sheet. The deposit constrains the distribution and timing of glacier build-up in southwestern British Columbia over the last glacial cycle and suggests that the ice sheet was absent or thin in the upper Lillooet River valley at this time. Field evidence suggests the pyroclastic density current was sourced at high elevation near present-day Plinth Peak and was deposited and preserved on the adjoining Lillooet River valley wall. Coeval, proximal valley-filling glacial ice was up to ∼120 m thick. Article in Journal/Newspaper Ice Sheet Canadian Science Publishing Canadian Journal of Earth Sciences 1 9 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
A new 40 Ar/ 39 Ar date from a pyroclastic density current deposit preserved on the northern slopes of the Lillooet River valley, British Columbia, indicates an explosive volcanic eruption of the Mount Meager Volcanic Complex (MMVC) at 24.3 ± 2.3 ka. The age of this pyroclastic deposit is a record of the second youngest explosive volcanic event for the MMVC and indicates that Mount Meager has erupted, explosively, at least twice in the past ∼25 000 years. The age of the volcanic eruption coincides with the early phase of growth of the late Wisconsin (Fraser) Cordilleran ice sheet. The deposit constrains the distribution and timing of glacier build-up in southwestern British Columbia over the last glacial cycle and suggests that the ice sheet was absent or thin in the upper Lillooet River valley at this time. Field evidence suggests the pyroclastic density current was sourced at high elevation near present-day Plinth Peak and was deposited and preserved on the adjoining Lillooet River valley wall. Coeval, proximal valley-filling glacial ice was up to ∼120 m thick. |
format |
Article in Journal/Newspaper |
author |
Russell, James K. Stewart, Martin Wilson, Alex Williams-Jones, Glyn |
spellingShingle |
Russell, James K. Stewart, Martin Wilson, Alex Williams-Jones, Glyn Eruption of Mount Meager, British Columbia, during the early Fraser glaciation |
author_facet |
Russell, James K. Stewart, Martin Wilson, Alex Williams-Jones, Glyn |
author_sort |
Russell, James K. |
title |
Eruption of Mount Meager, British Columbia, during the early Fraser glaciation |
title_short |
Eruption of Mount Meager, British Columbia, during the early Fraser glaciation |
title_full |
Eruption of Mount Meager, British Columbia, during the early Fraser glaciation |
title_fullStr |
Eruption of Mount Meager, British Columbia, during the early Fraser glaciation |
title_full_unstemmed |
Eruption of Mount Meager, British Columbia, during the early Fraser glaciation |
title_sort |
eruption of mount meager, british columbia, during the early fraser glaciation |
publisher |
Canadian Science Publishing |
publishDate |
2021 |
url |
http://dx.doi.org/10.1139/cjes-2021-0023 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2021-0023 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2021-0023 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Canadian Journal of Earth Sciences volume 58, issue 10, page 1146-1154 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2021-0023 |
container_title |
Canadian Journal of Earth Sciences |
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1 |
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9 |
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1802645595372912640 |