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

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
• Public URL: https://durham-repository.worktribe.com/output/1369710