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Crystal plasticity as an indicator of the viscous-brittle transition in magmas

Understanding the flow of multi-phase (melt, crystals and bubbles) magmas is of great importance for interpreting eruption dynamics. Here we report the first observation of crystal plasticity, identified using electron backscatter diffraction, in plagioclase in andesite dome lavas from Volcán de Col...

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Autores principales: Kendrick, J. E., Lavallée, Y., Mariani, E., Dingwell, D. B., Wheeler, J., Varley, N. R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5715024/
https://www.ncbi.nlm.nih.gov/pubmed/29203767
http://dx.doi.org/10.1038/s41467-017-01931-4
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author Kendrick, J. E.
Lavallée, Y.
Mariani, E.
Dingwell, D. B.
Wheeler, J.
Varley, N. R.
author_facet Kendrick, J. E.
Lavallée, Y.
Mariani, E.
Dingwell, D. B.
Wheeler, J.
Varley, N. R.
author_sort Kendrick, J. E.
collection PubMed
description Understanding the flow of multi-phase (melt, crystals and bubbles) magmas is of great importance for interpreting eruption dynamics. Here we report the first observation of crystal plasticity, identified using electron backscatter diffraction, in plagioclase in andesite dome lavas from Volcán de Colima, Mexico. The same lavas, deformed experimentally at volcanic conduit temperature and load conditions, exhibit a further, systematic plastic response in the crystalline fraction, observable as a lattice misorientation. At higher stress, and higher crystal fraction, the amount of strain accommodated by crystal plasticity is larger. Crystal plastic distortion is highest in the intact segments of broken crystals, which have exceeded their plastic limit. We infer that crystal plasticity precludes failure and can punctuate the viscous-brittle transition in crystal-bearing magmas at certain shallow magmatic conditions. Since crystal plasticity varies systematically with imposed conditions, this raises the possibility that it may be used as a strain marker in well-constrained systems.
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spelling pubmed-57150242017-12-06 Crystal plasticity as an indicator of the viscous-brittle transition in magmas Kendrick, J. E. Lavallée, Y. Mariani, E. Dingwell, D. B. Wheeler, J. Varley, N. R. Nat Commun Article Understanding the flow of multi-phase (melt, crystals and bubbles) magmas is of great importance for interpreting eruption dynamics. Here we report the first observation of crystal plasticity, identified using electron backscatter diffraction, in plagioclase in andesite dome lavas from Volcán de Colima, Mexico. The same lavas, deformed experimentally at volcanic conduit temperature and load conditions, exhibit a further, systematic plastic response in the crystalline fraction, observable as a lattice misorientation. At higher stress, and higher crystal fraction, the amount of strain accommodated by crystal plasticity is larger. Crystal plastic distortion is highest in the intact segments of broken crystals, which have exceeded their plastic limit. We infer that crystal plasticity precludes failure and can punctuate the viscous-brittle transition in crystal-bearing magmas at certain shallow magmatic conditions. Since crystal plasticity varies systematically with imposed conditions, this raises the possibility that it may be used as a strain marker in well-constrained systems. Nature Publishing Group UK 2017-12-04 /pmc/articles/PMC5715024/ /pubmed/29203767 http://dx.doi.org/10.1038/s41467-017-01931-4 Text en © The Author(s) 2017 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/.
spellingShingle Article
Kendrick, J. E.
Lavallée, Y.
Mariani, E.
Dingwell, D. B.
Wheeler, J.
Varley, N. R.
Crystal plasticity as an indicator of the viscous-brittle transition in magmas
title Crystal plasticity as an indicator of the viscous-brittle transition in magmas
title_full Crystal plasticity as an indicator of the viscous-brittle transition in magmas
title_fullStr Crystal plasticity as an indicator of the viscous-brittle transition in magmas
title_full_unstemmed Crystal plasticity as an indicator of the viscous-brittle transition in magmas
title_short Crystal plasticity as an indicator of the viscous-brittle transition in magmas
title_sort crystal plasticity as an indicator of the viscous-brittle transition in magmas
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5715024/
https://www.ncbi.nlm.nih.gov/pubmed/29203767
http://dx.doi.org/10.1038/s41467-017-01931-4
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