Shear-enhanced dynamic permeability development of magma vesiculating in cylindrical conduits
J. Birnbaum, J. Schauroth, J. Weaver, J. E. Kendrick, A. Lamur, Y. Lavallée
TL;DR
This study explores how shear forces affect bubble formation and permeability in magma, influencing volcanic eruptions.
Contribution
The research introduces new insights into how shear conditions impact bubble connectivity and permeability in magma.
Findings
Shear deformation connects existing vesicles, lowering the percolation threshold in anisotropic vesiculation.
Sheared samples show distinct porosity and permeability trends compared to unsheared samples.
Maintaining bubble and exterior connectivity is crucial for dynamic permeability in shearing melts.
Abstract
During magma vesiculation, permeability is established when growing bubbles form connected networks which allow fluids to percolate. This percolation threshold controls the relative rates between magma ascent and volatile outgassing, which in turn dictate eruptive style. Percolation in crystal-poor magmas is controlled primarily by vesicularity and shear. We investigate the effect of realistic shear conditions on system-spanning connectivity via vesiculation experiments on rhyolitic melts in a cylindrical, conduit-like geometry. The amount of shear experienced is controlled by varying the sample and confining diameters to allow for various degrees of free (isotropic) followed by confined (anisotropic) expansion. We observe two regimes of behavior for samples dominated by (1) initial isotropic vesiculation, in which the onset of permeability corresponds with the beginning of shear…
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Taxonomy
TopicsGeological and Geochemical Analysis · Mineralogy and Gemology Studies · CO2 Sequestration and Geologic Interactions