Speaker
Mr
Mattia Pistone
(ETH - Zurich)
Description
We present new experimental results on magma vesiculation at high temperature. During in situ high temperature (400-1100 °C), room pressure experiments, the evolving 3D structure was captured by ultrafast synchrotron-based X-ray tomographic microscopy performed at the TOMCAT beamline at SLS (PSI, Villigen), with a pixel size of 2.96 microns and 1 complete tomographic dataset acquired in 1 s. Sample heating was manually controlled with a class 4 laser heating system. Hydrous crystal- and bubble-free magmatic glasses from natural obsidians were employed for the experiments. We observed four main 3D microstructures: "low porous plinian pumice" with low amount of bubbles (40 vol%), showing a narrow range in bubble size and generally spherical shape of the bubbles; "normal plinian pumice" with high content of bubbles (80 vol%), showing a range of sizes, shapes and extent of coalescence; "pseudo-reticulite" (85 vol%), showing a polyhedral cell network; "gas slug", generated by expansion of one single bubble. The real-time three-dimensional analyses provide novel insights on the nucleation and exsolution mechanisms of volatiles that occur during ascent of magmas in volcanic conduits.
Please specify the session
Imaging
Please specify poster or talk
Poster
Primary author
Mr
Mattia Pistone
(ETH - Zurich)
Co-authors
Dr
Alison Rust
(University of Bristol)
Dr
Bjarne Sven Gustav Almqvist
(ETH - Zurich)
Dr
Eric Reusser
(ETH - Zurich)
Dr
Federica Marone
(Swiss Light Source - PSI)
Dr
Julie Fife
(Swiss Light Source - PSI)
Dr
Luca Caricchi
(University of Bristol)
Dr
Luigi Burlini
(ETH - Zurich)
Prof.
Peter Ulmer
(ETH - Zurich)
Dr
Philip Benson
(ETH - Zurich)
