Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

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.

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.

Item Type:Article
Full text:(VoR) Version of Record
Download PDF
(1409Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1002/2014JB011453
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 https://doi.org/ 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

Save or Share this output

Export:
Export
Look up in GoogleScholar