Donald B. Dingwell
Permeability of polydisperse magma foam
Dingwell, Donald B.; Wadsworth, Fabian B.; Vasseur, Jérémie
Abstract
Effective models for the evolution of magma permeability are key to understanding shallow magma ascent and eruption dynamics. Models are generally empirical constructs, commonly focused on monodisperse systems, and unable to cope with the foam limit at high porosity. Here, we confirm that bubble size distributions in high-porosity pyroclasts are highly polydisperse. We combine collated experimental data and numerical simulations to test and validate a theoretically grounded percolation model for isotropic magma permeability, which accounts for the effect of polydispersivity of bubble sizes. We find that the polydispersivity controls the percolation threshold. It also serves as essential input into the scaling of permeability that is required to achieve universality in the description of permeability. Our model performs well against collated published data for the permeability of high-porosity volcanic rocks. We then extend this model to predict the viscous and inertial contributions to fluid flow that are required to model magma outgassing in all regimes. Our scaling relationship holds across the full range of porosity, from the percolation threshold to the open-foam limit.
Citation
Dingwell, D. B., Wadsworth, F. B., & Vasseur, J. (2020). Permeability of polydisperse magma foam. Geology, 48(6), 536-540. https://doi.org/10.1130/g47094.1
Journal Article Type | Article |
---|---|
Acceptance Date | Jan 28, 2020 |
Online Publication Date | Mar 18, 2020 |
Publication Date | 2020-06 |
Deposit Date | Jul 1, 2020 |
Publicly Available Date | Jul 1, 2020 |
Journal | Geology |
Print ISSN | 0091-7613 |
Electronic ISSN | 1943-2682 |
Publisher | Geological Society of America |
Peer Reviewed | Peer Reviewed |
Volume | 48 |
Issue | 6 |
Pages | 536-540 |
DOI | https://doi.org/10.1130/g47094.1 |
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/
Copyright Statement
© 2020 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license.
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