experimental rock deformation; rheology of bubble-bearing magmas; viscosity; seismic wave propagation velocity; bubble-bearing magmas; magma rheology; petrology; synchrotron X-rax tomography; haplogranite system; seismic properties; volcanic magma systems; Lipari
Pistone Mattia, Caricchi Luca, Cordonnier Bennoit, Ulmer Peter (2016), Rheological flow laws for multiphase magmas: the first empirical approach, in Journal of Volcanology and Geothermal Research
, 321, 158-170.
Pistone Mattia, Arzilli F., Dobson Kate J., Cordonnier Bennoit, Reusser Eric, Ulmer Peter, Marone Ferderica, Whittington A.G., Mancini L., Fife Julie, Blundy Jon D. (2015), Gas-driven filter pressing in magmas: Insights into in-situ melt segregation from crystal mushes, in Geology
, 43, 699-702.
Pistone Mattia, caricchi Luca, Fife Julie, Mader K., Ulmer Peter (2015), In situ X-ray tomographic microscopy observations of vesiculation of bubble-free and bubble-bearing magmas, in Bulletin of Volcanology
, 77, 1-15.
Pistone Mattia, Cardonnier Bennoit, Caricchi Luca, Ulmer Peter, Marone Federica (2015), The viscous to brittle transition in crystal- and bubble-bearing magmas, in Frontiers in Earth Sciences
, 3, 1-14.
Pistone Mattia, Caricchi Luca, Ulmer Peter, Reusser Eric, Ardia Paola (2013), Rheology of volatile-bearing crystal mushes: Mobilization vs. viscous death, in Chemical Geology
, 345, 16-39.
Pistone Mattia Caricchi L. Ulmer P. Burlini L. Ardia P. Reusser E. Marone F. & Arbaret L. (2012), Deformation experiments of bubble- and crystal-bearing magmas: Rheological and microstructrural analysis, in Journal of Geophysical Research
, 117, 1-39.
Fife Juli F. Rappaz Micheal Pistone Mattia Celcer Tine & Mikuljan Gordan (2012), Development of a laser-based heating system for in-situ synchrotron-based X-ray tomographic microscopy, in Journal of Synchrotron Radiation
, 19, 352-358.
Cordonnier Benoit, Caricchi Luca, Pistone Mattia, Castro J., Hess Kai-Uwe, Manga Michael, Dingwell Donald B., Burlini Luigi (2012), The viscous-brittle transition of crystal-bearing slilic melt: direct observation of magma rupture and healing, in Geology
, 40, 611-614.
Caricchi Luca Pommier A. Pistone M. Castro J. Burgisser A. & Perugini D. (2011), Strain-induced magma degassing: insights from simple shear experiments on bubble-bearing melts, in Bulletin of Volcanology
, 73, 1245-1257.
This project requests funding for two years for one PhD student (Mattia Pistone) to finalize the PhD project started in September 2008. This proposal continues experimental studies initiated in spring 2004 aiming to quantify physical and rheologic properties of partially molten, crystal-rich, felsic, hydrous magmas under shallow crustal conditions relevant for high-level magma reservoirs and volcanic conduits. Specifically, we propose to gather quantitative information on viscosity, strain, differential stress, seismic wave propagation velocities and acoustic emissions of bubble-bearing, partially molten H2O-rich, felsic magma compositions in combining experimental petrology / rock deformation as well as limited field-based petrology and structural geology to extract crucial properties from sub-liquidus, high-level magma storage to volcanic systems. Such data are required to understand and model the dynamics of magma transport in volcanic conduits, to interpret the complex petrologic and structural patterns observed in shallow-level granitoids, extrusive and explosive volcanic rocks and to put constraints on the probability and style of volcanic eruptions from such magma reservoirs. We propose to continue the ongoing project already providing significant new data on the following subject: An experimental rock deformation, seismic velocity measurement and acoustic emission study on fully and partially molten, bubble-bearing felsic compositions (haplogranite in the Na2O-K2O-Al2O3-SiO2-H2O system) in a gas-pressure rock-deformation apparatus at 30 - 200 MPa and 400 - 1100°C. This project provides a set of quantitative data on the rheologic and elastic properties of hydrous magmas that are directly relevant for processes operating in sub-volcanic magma reservoirs and extrusion via ascent in a volcanic conduit by laminar flow and by shearing and fracturing. The possibility to access experimentally stress and strain rate ranges identical to those present during volcanic eruptions, provide the opportunity to explore the full rheological complexity of magmas that, in turn, controls transport and explosive fragmentation of magmas.Limited field work conducted on highly viscous magmas ranging from degassed crystal-poor to crystal-rich rhyolite to highly vesicular pumices on the island of Lipari supplements additional microstructural information on acidic volcanics extruded as lava flows, plugs or explosive sub-Plinian eruptions. Natural volcanics serve to test and apply experimental data, in particular macro- and microstructural findings, combined with the laboratory experiments, can help retrieving rheological information from natural erupted products. Both experimentally deformed and natural bubble-bearing samples are imaged by 3-D X-ray tomography at the SLS (PSI Villingen) to gain further information on the deformation mechanisms and to link microstructural observations directly with the measured rheologic and seismic behavior of the investigated samples.Direct measurements of seismic wave propagation velocities of both, compressional and shear waves, and acoustic emissions of fully and partially molten, bubble-bearing systems (magmas) under H2O-oversaturated conditions provide fundamental information for the identification of processes responsible for a variety of characteristic seismic events commonly related to the ascent and eruption of highly viscous, crystal and bubble-bearing magmas and for the localization and characterization of magmatic reservoirs in the Earth´s crust.