Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume 119, Issue 12, Pages 8792-8804Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JB011453
Keywords
relaxation; tuffisite; welding; jet engine; high-grade ignimbrite; Chaiten
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Funding
- European Union [282759]
- Deutsche Forschungsgemeinschaft (DFG) [LA2651/3-1]
- European Research Council [306488, 247076]
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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 Chaiten volcano as a case example. We predict that moderate linear cooling rates of >0.1 degrees C min(-1) can result in the common observation of incomplete sintering and the preservation of pore networks.
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