Non-stoichiometric crystal nucleation in a spodumene glass containing TiO2 as seed former: Effects on the viscosity of the residual melt

Zandonà, Alessio; Scarani, Alex; Löschmann, Jessica; Cicconi, Maria Rita; Di Fiore, Fabrizio; de Ligny, Dominique; Deubener, Joachim; Vona, Alessandro; Allix, Mathieu; Di Genova, Danilo

doi:10.1016/j.jnoncrysol.2023.122563

Cited by 6 publications

(1 citation statement)

References 66 publications

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“…The in-situ high-temperature measurements revealed the high reactivity of andesitic glasses and melts at a temperature above T g , emphasizing the need to apply a meticulous experimental methodology in deriving accurate pure melt viscosity 22,23,42 . In light of these considerations, we employed direct viscometry techniques, speci cally micropenetration and concentric cylinder viscometry (Supp.…”

Section: The Viscosity Of Homogeneous and Crystal-free Andesitic Meltsmentioning

confidence: 99%

Nanoscale chemical heterogeneities control magma viscosity and failure

Munoz,

Zandonà,

Löschmann

et al. 2024

Preprint

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Explosive volcanic eruptions, resulting from magma fragmentation, pose significant threats to inhabited regions. The challenge of achieving fragmentation conditions in less evolved compositions, such as andesites and basalts, stems from their low viscosities. Recent research highlights the role of Fe-Ti-oxide nanocrystals (nanolites) in increasing melt viscosity, yet the mechanisms behind the impact of nanocrystallization remain a subject of ongoing debate. To assess their effect on melt viscosity, we introduce innovative viscosity models exclusively utilizing nanolite-free viscosity data. Our study unveils the first in-situ imaging of nanolite formation in andesitic melt resulting in a heterogeneous distribution of elements, generating a relatively SiO2-enriched matrix and Al-enriched shells around nanolites. This phenomenon results in a substantial, up to 30-fold increase in magma viscosity at eruptive temperatures. By incorporating nanoscale observations of fragmented magma from the literature, we deduce that elemental heterogeneities might play a critical role in driving magmas towards failure conditions.

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Section: The Viscosity Of Homogeneous and Crystal-free Andesitic Meltsmentioning

confidence: 99%