HR: 0800h
AN: V31D-0681    [Abstracts]
TI: Chaotic Mixing in Magmatic Systems: a new experiment
AU: De Campos, C P
EM: campos@min.uni-muenchen.de
AF: Dept. of Earth and Environmental Sc./LMU, Theresienstr. 41/III, Munich, 80333, Germany
AU: * Perugini, D
EM: diegop@unipg.it
AF: Dept. of Earth Sciences, Univ. of Perugia, Piazza Universita, Perugia, 06100, Italy
AU: Dingwell, D B
EM: Dingwell@lmu.de
AF: Dept. of Earth and Environmental Sc./LMU, Theresienstr. 41/III, Munich, 80333, Germany
AU: Poli, G
EM: polig@unipg.it
AF: Dept. of Earth Sciences, Univ. of Perugia, Piazza Universita, Perugia, 06100, Italy
AU: Ertel-Ingrisch, W
EM: ertel@min.uni-muenchen.de
AF: Dept. of Earth and Environmental Sc./LMU, Theresienstr. 41/III, Munich, 80333, Germany
AU: Hess, K
EM: hess@min.uni-muenchen.de
AF: Dept. of Earth and Environmental Sc./LMU, Theresienstr. 41/III, Munich, 80333, Germany
AB: Previous studies on magma mixing systems have evidenced that mixing processes could be controlled by chaotic dynamics. These processes are thought to be the source of fractal structures propagating within natural magmatic systems, from meter to the micrometer length scale (Perugini et al., 2006. EPSL, 234: 669-680 and references therein). We have developed a device for experimental studies of chaotic mixing dynamics in silicate melts at high temperatures (up to 1700°C). This device has been inspired by the journal bearing or eccentric cylinder geometry for viscous fluids for the study of chaotic mixing in slow flows (Swanson and Ottino, 1990. J. Fluid Mech., 213:227-249). This geometry is thought to be an ideal system for chaotic studies because a) it is experimentally accessible/feasible for silicate rheologies and b) it is subject to an analytical solution for the stream function. In the journal bearing system the flow region, is confined in the torus between the centers of the two cylinders. Their central axes are parallel but not coincident, i. e. the cylinders are eccentric. In order to generate chaos in a flow, the streamlines must be time dependent, resulting in alternating movements between the two cylinders. This means that at least one of the cylinders has alternating rotation directions. The dimension of this new experimental device follows the required main dimensionless numbers for a chaotic flow. Our first experimental goal is to characterize the mixing process in a prototypical system (haplogranite-haplobasalt)under variable mixing protocols.
UR: http://www.min.geo.uni- muenchen.de/
DE: 1012 Reactions and phase equilibria (3612, 8412)
DE: 1036 Magma chamber processes (3618)
DE: 1065 Major and trace element geochemistry
DE: 1094 Instruments and techniques
DE: 3619 Magma genesis and partial melting (1037)
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting