Figure 2
Analogue experiments reveal the presence of particles may cause intermittent bursting of slugs interspersed by passive degassing regimes. (a) Photos of a low particle content experiment (particle fraction ≤ 0.1) in a vertical tube illustrating the frequent ascent of smaller bubbles in a liquid with suspended particles. (b) Time series of images from a high particle load experiment showing the formation, migration and bursting of a gas slug. Panel (i) to (vii): Image taken every second. (c) Image showing the transport of coloured liquid in the wake of a slug as it rises through the particle-rich mixture. Slug moves on a timescale of 10 s whereas liquid moves on a timescale of 1,000 s, which might lead to the shallow exsolution of dissolved gas from the magma. (d,e) Illustration showing channel flow in the deeper conduit and intermittent growth, ascent and explosions of the gas slugs, shaded blue, giving rise to the active degassing periods and channel flow near the surface giving rise to passive degassing, shaded purple . The crystal content in the magma is illustrated by the grey colour scale. All panels are described in the text.
