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URN to cite this document: urn:nbn:de:bvb:703-epub-9116-9
Title data
Valdivia Munoz, Pedro Antonio ; Zandonà, Alessio ; Löschmann, Jessica ; Bondar, Dmitry ; Genevois, Cécile ; Canizarès, Aurélien ; Allix, Mathieu ; Miyajima, Nobuyoshi ; Kurnosov, Alexander ; Boffa Ballaran, Tiziana ; Di Fiore, Fabrizio ; Vona, Alessandro ; Romano, Claudia ; Deubener, Joachim ; Bamber, Emily C. ; Longo, Alessandro ; Di Genova, Danilo:
Nanoscale chemical heterogeneities control the viscosity of andesitic magmas.
In: Communications Earth & Environment.
Vol. 6
(2025)
.
- 455.
ISSN 2662-4435
DOI der Verlagsversion: https://doi.org/10.1038/s43247-025-02424-9
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Abstract
Explosive volcanic eruptions, driven by magma fragmentation, pose significant geohazards due to their rapid energy release and widespread dispersal of pyroclasts. High magma viscosity promotes brittle fragmentation by limiting volatile escape and enhancing internal pressure buildup. Although recent studies have recognized that iron-titanium oxide nanocrystal formation increases melt viscosity, the mechanisms underlying this effect remain poorly constrained. Here we quantify the influence of nanocrystallization on magma viscosity by developing viscosity models that incorporate iron-titanium variations, calibrated against nanocrystal-free andesitic melts. Using time-resolved imaging, we show that nanocrystals form within seconds within synthetic andesitic melts. This process generates nanoscale chemical heterogeneities, including silica enrichment in the surrounding melt and aluminum-rich shells embedding the nanocrystals. These heterogeneities result in viscosity increases of up to 30-fold at eruptive temperatures. Our findings indicate that nanocrystallization modulates magma rheology during early crystallization, with direct implications for the dynamics of andesitic eruptions.
Further data
| Item Type: | Article in a journal |
|---|---|
| DDC Subjects: | 500 Science > 550 Earth sciences, geology |
| Institutions of the University: | Research Institutions > Central research institutes > Bavarian Research Institute of Experimental Geochemistry and Geophysics - BGI Research Institutions Research Institutions > Central research institutes |
| Language: | English |
| Originates at UBT: | Yes |
| URN: | urn:nbn:de:bvb:703-epub-9116-9 |
| Date Deposited: | 14 Apr 2026 07:46 |
| Last Modified: | 14 Apr 2026 07:46 |
| URI: | https://epub.uni-bayreuth.de/id/eprint/9116 |
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