The White River Ash: largest Holocene Plinian tephra
The White River Ash is a bi-lobate tephra in eastern Alaska, Yukon Territory, and western Northwest Territories. Plinian-type eruptions produced the north lobe ∼1900 years BP and the larger east lobe ∼1250 years BP ( 14 C years). Present evidence favors the vent for the east lobe to be beneath the K...
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crcansciencepubl:10.1139/e08-023 2024-04-28T08:19:45+00:00 The White River Ash: largest Holocene Plinian tephra Lerbekmo, J. F. Greenough, John 2008 http://dx.doi.org/10.1139/e08-023 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-023 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-023 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 45, issue 6, page 693-700 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2008 crcansciencepubl https://doi.org/10.1139/e08-023 2024-04-09T06:56:24Z The White River Ash is a bi-lobate tephra in eastern Alaska, Yukon Territory, and western Northwest Territories. Plinian-type eruptions produced the north lobe ∼1900 years BP and the larger east lobe ∼1250 years BP ( 14 C years). Present evidence favors the vent for the east lobe to be beneath the Klutlan Glacier. East lobe pumice is not present atop Mt. Churchill, so the pumice there must belong to the north lobe and is also likely to have come from a vent beneath the Klutlan Glacier. Isopachs of the east lobe, now known to stretch as far east as Great Bear Lake, indicate an east lobe volume of ∼47 km 3 . Thickness and grain size of the east lobe decay in exponential fashion, producing straight line plots when the thickness half-distance and clast half-distance are plotted against the square root of the isopach area, the proximal slope being steeper than the distal. The east lobe eruption is indicated to have been into a wind of about 10 m/s and to have produced an eruptive cloud height of ∼45 km. The eruption rate was at least 2.8 × 10 8 kg/s. Article in Journal/Newspaper glacier Great Bear Lake Northwest Territories Alaska Yukon Canadian Science Publishing Canadian Journal of Earth Sciences 45 6 693 700 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Lerbekmo, J. F. The White River Ash: largest Holocene Plinian tephra |
topic_facet |
General Earth and Planetary Sciences |
description |
The White River Ash is a bi-lobate tephra in eastern Alaska, Yukon Territory, and western Northwest Territories. Plinian-type eruptions produced the north lobe ∼1900 years BP and the larger east lobe ∼1250 years BP ( 14 C years). Present evidence favors the vent for the east lobe to be beneath the Klutlan Glacier. East lobe pumice is not present atop Mt. Churchill, so the pumice there must belong to the north lobe and is also likely to have come from a vent beneath the Klutlan Glacier. Isopachs of the east lobe, now known to stretch as far east as Great Bear Lake, indicate an east lobe volume of ∼47 km 3 . Thickness and grain size of the east lobe decay in exponential fashion, producing straight line plots when the thickness half-distance and clast half-distance are plotted against the square root of the isopach area, the proximal slope being steeper than the distal. The east lobe eruption is indicated to have been into a wind of about 10 m/s and to have produced an eruptive cloud height of ∼45 km. The eruption rate was at least 2.8 × 10 8 kg/s. |
author2 |
Greenough, John |
format |
Article in Journal/Newspaper |
author |
Lerbekmo, J. F. |
author_facet |
Lerbekmo, J. F. |
author_sort |
Lerbekmo, J. F. |
title |
The White River Ash: largest Holocene Plinian tephra |
title_short |
The White River Ash: largest Holocene Plinian tephra |
title_full |
The White River Ash: largest Holocene Plinian tephra |
title_fullStr |
The White River Ash: largest Holocene Plinian tephra |
title_full_unstemmed |
The White River Ash: largest Holocene Plinian tephra |
title_sort |
white river ash: largest holocene plinian tephra |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/e08-023 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-023 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-023 |
genre |
glacier Great Bear Lake Northwest Territories Alaska Yukon |
genre_facet |
glacier Great Bear Lake Northwest Territories Alaska Yukon |
op_source |
Canadian Journal of Earth Sciences volume 45, issue 6, page 693-700 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e08-023 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
45 |
container_issue |
6 |
container_start_page |
693 |
op_container_end_page |
700 |
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1797583082563305472 |