Articles | Volume 7, issue 5
Research article
27 Sep 2016
Research article |  | 27 Sep 2016

Eruptive shearing of tube pumice: pure and simple

Donald B. Dingwell, Yan Lavallée, Kai-Uwe Hess, Asher Flaws, Joan Marti, Alexander R. L. Nichols, H. Albert Gilg, and Burkhard Schillinger

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Cited articles

Ashwell, P. A., Kendrick, J. E., Lavallée, Y., Kennedy, B. M., Hess, K. U., von Aulock, F. W., Wadsworth, F. B., Vasseur, J., and Dingwell, D. B.: Permeability of compacting porous lavas, J. Geophys. Res.-Sol. Ea., 120, 1605–1622,, 2015.
Bagdassarov, N., Dorfman, A., and Dingwell, D. B.: Effect of alkalis, phosphorus, and water on the surface tension of haplogranite melt, Am. Mineral., 85, 33–40, 2000.
Bai, L. P., Baker, D. R., and Hill, R. J.: Permeability of vesicular Stromboli basaltic glass: Lattice Boltzmann simulations and laboratory measurements, J. Geophys. Res.-Sol. Ea., 115,, 2011.
Baker, D. R., Brun, F., O'Shaughnessy, C., Mancini, L., Fife, J. L., and Rivers, M.: A four-dimensional X-ray tomographic microscopy study of bubble growth in basaltic foam, Nat. Commun., 3,, 2012.
Bouvet De Maisonneuve, C., Dungan, M. A., Bachmann, O., and Burgisser, A.: Petrological Insights into Shifts in Eruptive Styles at Volcan Llaima (Chile), J. Petrol., 54, 393–420, 2013.
Short summary
Here, we use tomography to reconstructed the pores of erupted pumice and understand the evolution of gas bubbles in magma. Analysis of the pore geometry is used to describe whether the pores where aligned by stretching as ascending magma is pulled apart (pure shear) or sheared like a deck of card (simple shear). We conclude that the latter, simple shear, dominates during magma ascent up to the points where magma fragments to cause an explosion.