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

Paredes-Marino, Joali; Dobson, Katherine J.; Ortenzi, Gianluigi; Küppers, Ulrich; Morgavi, Daniele; Petrelli, Maurizio; Hess, Kai-Uwe; Läger, Kathrin; Porreca, Massimiliano; Pimentel, Adriano and Perugini, Diego (2017): Enhancement of eruption explosivity by heterogeneous bubble nucleation triggered by magma mingling. In: Scientific Reports, Vol. 7, 16897

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.

• Item Type: Journal article
• Faculties: Geosciences > Department of Earth and Environmental Sciences
• Subjects: 500 Science > 550 Earth sciences and geology
• ISSN: 2045-2322
• Language: English