Three-dimensional investigation of volcanic textures by X-ray microtomography and implications for conduit processes
Article first published online: 14 JUL 2006
Copyright 2006 by the American Geophysical Union.
Geophysical Research Letters
Volume 33, Issue 13, July 2006
How to Cite
2006), Three-dimensional investigation of volcanic textures by X-ray microtomography and implications for conduit processes, Geophys. Res. Lett., 33, L13312, doi:10.1029/2006GL026241., , , , and (
- Issue published online: 14 JUL 2006
- Article first published online: 14 JUL 2006
- Manuscript Accepted: 23 MAY 2006
- Manuscript Revised: 20 APR 2006
- Manuscript Received: 8 MAR 2006
 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.