Michael J. Heap
The Permeability of Porous Volcanic Rock Through the Brittle‐Ductile Transition
Heap, Michael J.; Meyer, Gabriel G.; Noël, Corentin; Wadsworth, Fabian B.; Baud, Patrick; Violay, Marie E.S.
Authors
Gabriel G. Meyer
Corentin Noël
Dr Fabian Wadsworth fabian.b.wadsworth@durham.ac.uk
Associate Professor
Patrick Baud
Marie E.S. Violay
Abstract
The permeability of volcanic rock controls the distribution of pore fluids and pore fluid pressure within a volcanic edifice, and is therefore considered to influence eruptive style and volcano deformation. We measured the porosity and permeability of a porous volcanic rock during deformation in the brittle and ductile regimes. In the brittle regime, permeability decreases by a factor of 2–6 up to the peak stress due the closure of narrow pore throats but, following shear fracture formation, remains approximately constant as strain is accommodated by sliding on the fracture. In the ductile regime, permeability continually decreases, by up to an order of magnitude, as a function of strain. Although compaction in the ductile regime is localized, permeability is not reduced substantially due to the tortuous and diffuse nature of the compaction bands, the geometry of which was also influenced by a pore shape preferred orientation. Although the evolution of the permeability of the studied porous volcanic rock in the brittle and ductile regimes is qualitatively similar to that for porous sedimentary rocks, the porosity sensitivity exponent of permeability in the elastic regime is higher than found previously for porous sedimentary rocks. This exponent decreases during shear-enhanced compaction toward a value theoretically derived for granular media, suggesting that the material is effectively granulating. Indeed, cataclastic pore collapse evolves the microstructure to one that is more granular. Understanding how permeability can evolve in a volcanic edifice will improve the accuracy of models designed to assist volcano monitoring and volcanic hazard mitigation.
Citation
Heap, M. J., Meyer, G. G., Noël, C., Wadsworth, F. B., Baud, P., & Violay, M. E. (2022). The Permeability of Porous Volcanic Rock Through the Brittle‐Ductile Transition. Journal of Geophysical Research. Solid Earth, 127(6), https://doi.org/10.1029/2022jb024600
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 16, 2022 |
Online Publication Date | Jun 20, 2022 |
Publication Date | 2022 |
Deposit Date | Jul 19, 2022 |
Publicly Available Date | Jul 19, 2022 |
Journal | Journal of Geophysical Research: Solid Earth |
Print ISSN | 2169-9313 |
Electronic ISSN | 2169-9356 |
Publisher | American Geophysical Union |
Peer Reviewed | Peer Reviewed |
Volume | 127 |
Issue | 6 |
DOI | https://doi.org/10.1029/2022jb024600 |
Public URL | https://durham-repository.worktribe.com/output/1200125 |
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/
Copyright Statement
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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