Luiz Pereira
The rheological response of magma to nanolitisation
Pereira, Luiz; Linard, Yannick; Wadsworth, Fabian B.; Vasseur, Jérémie; Hess, Kai-Uwe; Moretti, Roberto; Dingwell, Donald B.; Neuville, Daniel R.
Authors
Yannick Linard
Dr Fabian Wadsworth fabian.b.wadsworth@durham.ac.uk
Associate Professor
Jérémie Vasseur
Kai-Uwe Hess
Roberto Moretti
Donald B. Dingwell
Daniel R. Neuville
Abstract
Viscosity exerts a fundamental control on magmatic kinetics and dynamics, controlling magma ascent, eruptive style, and the emplacement of lava. Nanolites – crystals smaller than a micron – are thought to affect magma viscosity, but the underlying mechanisms for this remain unclear. Here, we use a cylinder compression creep technique to measure the viscosity of supercooled silicate liquids with different amounts of iron (0–20 wt% FeOtot) as a function of temperature, applied shear stress, and time. Sample viscosity was independent on the applied shear stresses, and as expected, melt viscosity decreases as temperature is increased, but only until a critical temperature where a time-dependent increase in viscosity occurs for samples contaning 6.0 wt% FeOtot or more. The magnitude of this increase is controlled by the melt iron content. At constant temperature, these changes are substantial and can reach up to three orders of magnitude for the sample with the most iron. Using transmission electron microscopy, X-ray diffraction, and viscosity modelling, we conclude that this viscosity increase is caused by the formation of nanolites. By using scaling approaches to test suspension effects with and without crystal aggregation, we conclude that the nanolites have only a minimal direct physical effect on the observed viscosity change. Rather, our models show that it is the chemical shift in the groundmass silicate melt composition associated with non-stoichiometric crystallisation that dominates the observed viscosity increase. These findings suggest that iron-rich silicates may encounter chemical viscosity jumps once certain elements are removed from the melt phase to form nanolites. Our work demonstrates an underlying mechanism for the role played by nanolites in viscosity changes of magmas.
Citation
Pereira, L., Linard, Y., Wadsworth, F. B., Vasseur, J., Hess, K., Moretti, R., …Neuville, D. R. (2024). The rheological response of magma to nanolitisation. Journal of Volcanology and Geothermal Research, 448, Article 108039. https://doi.org/10.1016/j.jvolgeores.2024.108039
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 29, 2024 |
Online Publication Date | Mar 1, 2024 |
Publication Date | 2024-04 |
Deposit Date | May 16, 2024 |
Publicly Available Date | May 16, 2024 |
Journal | Journal of Volcanology and Geothermal Research |
Print ISSN | 0377-0273 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 448 |
Article Number | 108039 |
DOI | https://doi.org/10.1016/j.jvolgeores.2024.108039 |
Public URL | https://durham-repository.worktribe.com/output/2442564 |
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http://creativecommons.org/licenses/by-nc-nd/4.0/
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Copyright Statement
© 2024 The Authors.
Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
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