Three-dimensional investigation of volcanic textures by X-ray microtomography and implications for conduit processes

Details Three-dimensional investigation of volcanic textures by X-ray microtomography and implications for conduit processes Three-dimensional investigation of volcanic textures by X-ray microtomography and implications for conduit processes

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3313312p&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 13, CiteID L13312

Physics

15

Volcanology: Eruption Mechanisms And Flow Emplacement, Volcanology: Magma Migration And Fragmentation, Volcanology: Instruments And Techniques

Scientific paper

Synchrotron X-ray computed microtomography (μCT) was applied for the first time to clasts of pumice and scoria generated by active, explosive volcanoes characterized by a range of eruptive styles (mild Strombolian to Plinian) and magmatic composition (basaltic to trachytic). The obtained two-dimensional (2D) tomographic images, corresponding to sample views at different rotation angles, were processed to reconstruct three-dimensional (3D) volumes and then used to make 3D measurements of vesicularity, vesicle number density, volume and connectivity for quantitative characterization of the investigated tephras. The results indicate a positive correlation between vesicle number density and eruption intensity that is used to investigate modes of magma degassing in explosive eruptions. In addition, the vesicle geometry affecting the connected gas flow pathways in pyroclasts from Strombolian eruptions is determined and related to the known permeabilities. Implications on the dynamics of explosive eruptions is discussed and, ultimately, used to quantitatively discriminate between different eruptive styles.

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