Degassing and gas percolation in basaltic magmas

Due to their generally low eruptive melt viscosities and concomitant high diffusivities of volatiles, basaltic magmas degas relatively efficiently. This relative efficiency, combined with variations in style, extent, timing length scales degassing govern the range styles observed at volcanoes. The result is a surprising complexity regimes products volcanism. In particular, transition between closed- open-system pressure percolation threshold may strongly affect type eruption. Here we aim better understand gas processes implications for style. Combining new literature data, present database vesicle metrics rocks including vesicularity, number density, size distribution (and its polydispersivity), connectivity permeability. We combine these textural petrophysical data numerical model systems having polydisperse distributions. Using this model, also evaluate different definitions inherent measurement techniques. Our results show that polydispersivity exerts strong control on consequently Intermediate highly bubble networks are more typical Hawaiian activity characterized by higher values threshold. delayed coalescence an increase magma vesicularity hindering formation large decoupled buoyant bubbles, which turn can promote acceleration, fragmentation inertia below sustained fountaining activity. Bubble populations lower polydispersivity, Strombolian eruptions, early prior fragmentation, lead slugs or pockets and/or plugs surface via outgassing. Further, discuss our findings Plinian, violent Strombolian, Surtseyan, deep submarine effusive eruptions.