Abstract
F. Legros writes: ⇓Sparks et al. (1999) propose a new mechanism for welding of pyroclastic deposits by gas resorption rather than gas expulsion. Based on a scaling analysis, they suggest two possible regimes for gas behaviour following emplacement of hot pyroclastic deposits: a gas retention regime and a gas escape regime . In their novel gas retention regime, soluble gases are resorbed back into the glass rather than expulsed out of the compacting deposit. This occurs when the time-scale of compaction is less than the time-scale of gas escape. ⇓Sparks et al. (1999) propose that in the gas retention regime, resorption of water greatly speeds up welding by reducing the viscosity of the glass. They suggest that welding is …
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