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Authors: Bai, L.* 
Baker, D. R.* 
Polacci, M.* 
Hill, R. J.* 
Title: In-situ degassing study on crystal-bearing Stromboli basaltic magmas: Implications for Stromboli explosions
Issue Date: 7-Sep-2011
Series/Report no.: /38(2011)
DOI: 10.1029/2011GL048540
Keywords: Experimental volcanism
crystal-bearing magmas
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.02. Experimental volcanism 
04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks 
Abstract: Three-dimensional crystal and bubble sizes and distributions in experimentally produced vesicular crystal-bearing Stromboli basalts and natural scoria were studied with X-ray microtomography (μCT) at high (1.85 μm) and low (5.46–9.0 μm) resolution. The permeabilities from lattice Boltzmann (LB) simulations and experimental measurements are about 1–2 orders of magnitude higher than in aphyric Stromboli basalts at porosity 31.6–55.3%. We propose that the higher permeability in crystal-bearing samples results in highly efficient degassing in shallow, highly porphyritc (HP) magma as opposed to the deeper, aphyric (LP) magma. In paroxysmal explosions, the LP magma flows up in a cylindrical conduit due to the density and viscosity difference between the two magmas. This type of convection can cause the LP magma with exsolved gas to be efficiently transferred through the overlying HP magma, potentially resulting in the more-violent paroxysmal explosions.
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