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Nonisothermal viscous sintering of volcanic ash.

Wadsworth, Fabian B. and Vasseur, Jérémie and von Aulock, Felix W. and Hess, Kai-Uwe and Scheu, Bettina and Lavallée, Yan and Dingwell, Donald B. (2014) 'Nonisothermal viscous sintering of volcanic ash.', Journal of geophysical research : solid earth., 119 (12). pp. 8792-8804.


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.

Item Type:Article
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Publisher 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 and enter the DOI.
Date accepted:20 November 2014
Date deposited:12 June 2018
Date of first online publication:20 December 2014
Date first made open access:No date available

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