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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...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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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. |
format | Online Article Text |
id | pubmed-9122929 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
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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