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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.

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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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