HR: 08:00h
AN: MR21A-01 INVITED    [Abstracts]
TI: 3-D Flow pattern detection in magmas by image analysis
AU: * Launeau, P
EM: Patrick.Launeau@univ-nantes.fr
AF: UMR-CNRS 6112 LPGNantes, Universite de Nantes, Faculte des Sciences et Techniques, 2 rue de la houssiniere, Nantes, 44322, France
AB: Detecting a magmatic flow pattern in an igneous rock is not easy. Mineral grains usually only display a weak mineral shape anisotropy, and late growth and boundary migration tend to erase the original magma fabric. A consistent preferred orientation pattern is therefore often impossible to detect by eye. However, image analysis of the same rocks, using only preferred orientation of grain boundaries can yield patterns that are very consistent over 10s of kilometres. Rapid analysis of boundary and of grain shapes on three or more sections can thus be used to build fabric ellipsoids and to constrain three-dimensional flow patterns. It is applied to various examples using SEM, microscope in a lab and camera in the field.
UR: http://www.sciences.univ-nantes.fr/geol/UMR6112/SPO
DE: 3618 Magma chamber processes (1036)
DE: 3625 Petrography, microstructures, and textures
DE: 8137 Hotspots, large igneous provinces, and flood basalt volcanism
DE: 8145 Physics of magma and magma bodies
DE: 8414 Eruption mechanisms and flow emplacement
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting