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Bubble accumulation and its role in the evolution of magma reservoirs in the upper crust.
Parmigiani A., Faroughi S., Huber C., Bachmann O., Su Y.
The efficiency of gas migration in crystal-rich and crystal-poor regions of zoned magmatic reservoirs has implications for the evolution of shallow magmatic systems. By investigating the fluid dynamics that controls buoyant gas transport at different crystallinity, we show how the interplay between capillary, buoyancy and viscous stresses results in a counter-intuitive dynamics, whereby gas tends to migrate efficiently in crystal-rich parts of a magma reservoir and accumulates in crystal-poor regions. The accumulation of gas bubbles in crystal-poor magmas can explain why such magmas are highly eruptible and offer a likely source of excess sulfur released during their eruptions.