Dr Fabian Wadsworth fabian.b.wadsworth@durham.ac.uk
Associate Professor
Nonisothermal viscous sintering of volcanic ash
Wadsworth, Fabian B.; Vasseur, Jérémie; von Aulock, Felix W.; Hess, Kai-Uwe; Scheu, Bettina; Lavallée, Yan; Dingwell, Donald B.
Authors
Jérémie Vasseur
Felix W. von Aulock
Kai-Uwe Hess
Bettina Scheu
Yan Lavallée
Donald B. Dingwell
Abstract
Volcanic ash is often deposited in a hot state. Volcanic ash containing glass, deposited above the glass transition interval, has the potential to sinter viscously both to itself (particle‐particle) and to exposed surfaces. Here we constrain the kinetics of this process experimentally under nonisothermal conditions using standard glasses. In the absence of external load, this process is dominantly driven by surface relaxation. In such cases the sintering process is rate limited by the melt viscosity, the size of the particles and the melt‐vapor interfacial tension. We propose a polydisperse continuum model that describes the transition from a packing of particles to a dense pore‐free melt and evaluate its efficacy in describing the kinetics of volcanic viscous sintering. We apply our model to viscous sintering scenarios for cooling crystal‐poor rhyolitic ash using the 2008 eruption of Chaitén volcano as a case example. We predict that moderate linear cooling rates of > 0.1°C min−1 can result in the common observation of incomplete sintering and the preservation of pore networks.
Citation
Wadsworth, F. B., Vasseur, J., von Aulock, F. W., Hess, K., Scheu, B., Lavallée, Y., & Dingwell, D. B. (2014). Nonisothermal viscous sintering of volcanic ash. Journal of Geophysical Research. Solid Earth, 119(12), 8792-8804. https://doi.org/10.1002/2014jb011453
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 20, 2014 |
Online Publication Date | Dec 20, 2014 |
Publication Date | Dec 20, 2014 |
Deposit Date | Mar 20, 2018 |
Publicly Available Date | Mar 28, 2024 |
Journal | Journal of Geophysical Research. Solid Earth |
Print ISSN | 2169-9313 |
Electronic ISSN | 2169-9356 |
Publisher | American Geophysical Union |
Peer Reviewed | Peer Reviewed |
Volume | 119 |
Issue | 12 |
Pages | 8792-8804 |
DOI | https://doi.org/10.1002/2014jb011453 |
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Copyright Statement
Wadsworth, Fabian B., Vasseur, Jérémie, von Aulock, Felix W., Hess, Kai-Uwe, Scheu, Bettina, Lavallée, Yan & Dingwell, Donald B. (2014). Nonisothermal viscous sintering of volcanic ash. Journal of Geophysical Research: Solid Earth 119(12): 8792-8804, 10.1002/2014JB011453 (DOI). To view the published open abstract, go to https://doi.org/ and enter the DOI.
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