Evidence for magma heterogeneity in the White River Ash (Yukon Territory)
Two Recent Plinian eruptions in the Wrangell Mountains (southeast Alaska) gave rise to two distinct ash-fall deposits that are collectively known as the White River Ash and cover much of the Yukon Territory, northwest Canada. Analysis of the pumiceous glass indicates that the magma chamber was compo...
Published in: | Canadian Journal of Earth Sciences |
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Canadian Science Publishing
1985
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Online Access: | http://dx.doi.org/10.1139/e85-096 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-096 |
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crcansciencepubl:10.1139/e85-096 2023-12-17T10:51:35+01:00 Evidence for magma heterogeneity in the White River Ash (Yukon Territory) Downes, Hilary 1985 http://dx.doi.org/10.1139/e85-096 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-096 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 22, issue 6, page 929-934 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1985 crcansciencepubl https://doi.org/10.1139/e85-096 2023-11-19T13:38:56Z Two Recent Plinian eruptions in the Wrangell Mountains (southeast Alaska) gave rise to two distinct ash-fall deposits that are collectively known as the White River Ash and cover much of the Yukon Territory, northwest Canada. Analysis of the pumiceous glass indicates that the magma chamber was compositionally inhomogeneous prior to each eruption. No compositional stratigraphy has been detected in the deposits, indicating either thorough mixing in the eruption cloud or thorough reworking after deposition. Thus each individual sample of ash represents a large part of the magma chamber, whereas larger pumice fragments are more homogeneous. Variations in temperature, 950–990 and 995–1030 °C, respectively, for the older and younger eruptions, and −log fo 2 values, 9.3–8.3 and 8.3–7.7, derived from the Fe–Ti oxides, support the conclusion that the magma chamber was inhomogeneous. Article in Journal/Newspaper Alaska Yukon Canadian Science Publishing (via Crossref) Yukon Canada Canadian Journal of Earth Sciences 22 6 929 934 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Downes, Hilary Evidence for magma heterogeneity in the White River Ash (Yukon Territory) |
topic_facet |
General Earth and Planetary Sciences |
description |
Two Recent Plinian eruptions in the Wrangell Mountains (southeast Alaska) gave rise to two distinct ash-fall deposits that are collectively known as the White River Ash and cover much of the Yukon Territory, northwest Canada. Analysis of the pumiceous glass indicates that the magma chamber was compositionally inhomogeneous prior to each eruption. No compositional stratigraphy has been detected in the deposits, indicating either thorough mixing in the eruption cloud or thorough reworking after deposition. Thus each individual sample of ash represents a large part of the magma chamber, whereas larger pumice fragments are more homogeneous. Variations in temperature, 950–990 and 995–1030 °C, respectively, for the older and younger eruptions, and −log fo 2 values, 9.3–8.3 and 8.3–7.7, derived from the Fe–Ti oxides, support the conclusion that the magma chamber was inhomogeneous. |
format |
Article in Journal/Newspaper |
author |
Downes, Hilary |
author_facet |
Downes, Hilary |
author_sort |
Downes, Hilary |
title |
Evidence for magma heterogeneity in the White River Ash (Yukon Territory) |
title_short |
Evidence for magma heterogeneity in the White River Ash (Yukon Territory) |
title_full |
Evidence for magma heterogeneity in the White River Ash (Yukon Territory) |
title_fullStr |
Evidence for magma heterogeneity in the White River Ash (Yukon Territory) |
title_full_unstemmed |
Evidence for magma heterogeneity in the White River Ash (Yukon Territory) |
title_sort |
evidence for magma heterogeneity in the white river ash (yukon territory) |
publisher |
Canadian Science Publishing |
publishDate |
1985 |
url |
http://dx.doi.org/10.1139/e85-096 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-096 |
geographic |
Yukon Canada |
geographic_facet |
Yukon Canada |
genre |
Alaska Yukon |
genre_facet |
Alaska Yukon |
op_source |
Canadian Journal of Earth Sciences volume 22, issue 6, page 929-934 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e85-096 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
22 |
container_issue |
6 |
container_start_page |
929 |
op_container_end_page |
934 |
_version_ |
1785576898578874368 |