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Enhancement of eruption explosivity by heterogeneous bubble nucleation triggered by magma mingling

Paredes-Mariño, Joali; Dobson, Katherine J.; Ortenzi, Gianluigi; Kueppers, Ulrich; Morgavi, Daniele; Petrelli, Maurizio; Hess, Kai-Uwe; Laeger, Kathrin; Porreca, Massimiliano; Pimentel, Adriano; Perugini, Diego

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Authors

Joali Paredes-Mariño

Katherine J. Dobson

Gianluigi Ortenzi

Ulrich Kueppers

Daniele Morgavi

Maurizio Petrelli

Kai-Uwe Hess

Kathrin Laeger

Massimiliano Porreca

Adriano Pimentel

Diego Perugini



Abstract

We present new evidence that shows magma mingling can be a key process during highly explosive eruptions. Using fractal analysis of the size distribution of trachybasaltic fragments found on the inner walls of bubbles in trachytic pumices, we show that the more mafic component underwent fracturing during quenching against the trachyte. We propose a new mechanism for how this magmatic interaction at depth triggered rapid heterogeneous bubble nucleation and growth and could have enhanced eruption explosivity. We argue that the data support a further, and hitherto unreported contribution of magma mingling to highly explosive eruptions. This has implications for hazard assessment for those volcanoes in which evidence of magma mingling exists.

Citation

Paredes-Mariño, J., Dobson, K. J., Ortenzi, G., Kueppers, U., Morgavi, D., Petrelli, M., …Perugini, D. (2017). Enhancement of eruption explosivity by heterogeneous bubble nucleation triggered by magma mingling. Scientific Reports, 7, Article 16897. https://doi.org/10.1038/s41598-017-17098-3

Journal Article Type Article
Acceptance Date Nov 22, 2017
Online Publication Date Dec 4, 2017
Publication Date Dec 4, 2017
Deposit Date Dec 13, 2017
Publicly Available Date Dec 14, 2017
Journal Scientific Reports
Publisher Nature Research
Peer Reviewed Peer Reviewed
Volume 7
Article Number 16897
DOI https://doi.org/10.1038/s41598-017-17098-3

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Copyright Statement
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/.





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