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Inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour

During explosive eruption of low viscosity magmas, pyroclasts are cooled predominantly by forced convection. Depending on the cooling efficiency relative to other timescales, a spectrum of deposits can be formed. Deposition of hot clasts, above their glass transition temperature, can form spatter mo...

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Autores principales: Jones, Thomas J., Le Moigne, Yannick, Russell, James K., Williams-Jones, Glyn, Giordano, Daniele, Dingwell, Donald B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9122929/
https://www.ncbi.nlm.nih.gov/pubmed/35595774
http://dx.doi.org/10.1038/s41467-022-30501-6
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author Jones, Thomas J.
Le Moigne, Yannick
Russell, James K.
Williams-Jones, Glyn
Giordano, Daniele
Dingwell, Donald B.
author_facet Jones, Thomas J.
Le Moigne, Yannick
Russell, James K.
Williams-Jones, Glyn
Giordano, Daniele
Dingwell, Donald B.
author_sort Jones, Thomas J.
collection PubMed
description During explosive eruption of low viscosity magmas, pyroclasts are cooled predominantly by forced convection. Depending on the cooling efficiency relative to other timescales, a spectrum of deposits can be formed. Deposition of hot clasts, above their glass transition temperature, can form spatter mounds, ramparts and clastogenic lava flows. Clasts may also be deposited cold, producing tephra cones and blankets. Thus, the deposit and pyroclast type can provide information about eruption dynamics and magma properties. Here we examine pyroclasts from Tseax volcano, British Columbia, Canada. These newly identified inflated pyroclasts, are fluidal in form, have undergone post-depositional expansion, and are found juxtaposed with scoria. Detailed field, chemical and textural observations, coupled with high temperature rheometry and thermal modelling, reveal that abrupt transitions in eruptive behaviour — from lava fountaining to low-energy bubble bursts — created these pyroclastic deposits. These findings should help identify transitions in eruptive behaviour at other mafic volcanoes worldwide.
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spelling pubmed-91229292022-05-22 Inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour Jones, Thomas J. Le Moigne, Yannick Russell, James K. Williams-Jones, Glyn Giordano, Daniele Dingwell, Donald B. Nat Commun Article During explosive eruption of low viscosity magmas, pyroclasts are cooled predominantly by forced convection. Depending on the cooling efficiency relative to other timescales, a spectrum of deposits can be formed. Deposition of hot clasts, above their glass transition temperature, can form spatter mounds, ramparts and clastogenic lava flows. Clasts may also be deposited cold, producing tephra cones and blankets. Thus, the deposit and pyroclast type can provide information about eruption dynamics and magma properties. Here we examine pyroclasts from Tseax volcano, British Columbia, Canada. These newly identified inflated pyroclasts, are fluidal in form, have undergone post-depositional expansion, and are found juxtaposed with scoria. Detailed field, chemical and textural observations, coupled with high temperature rheometry and thermal modelling, reveal that abrupt transitions in eruptive behaviour — from lava fountaining to low-energy bubble bursts — created these pyroclastic deposits. These findings should help identify transitions in eruptive behaviour at other mafic volcanoes worldwide. Nature Publishing Group UK 2022-05-20 /pmc/articles/PMC9122929/ /pubmed/35595774 http://dx.doi.org/10.1038/s41467-022-30501-6 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Jones, Thomas J.
Le Moigne, Yannick
Russell, James K.
Williams-Jones, Glyn
Giordano, Daniele
Dingwell, Donald B.
Inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour
title Inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour
title_full Inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour
title_fullStr Inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour
title_full_unstemmed Inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour
title_short Inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour
title_sort inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9122929/
https://www.ncbi.nlm.nih.gov/pubmed/35595774
http://dx.doi.org/10.1038/s41467-022-30501-6
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