HR: 1340h
AN: MR23B-0057    [Abstracts]
TI: The Effect of Incorporation of Iron on the Perovskite and Post-perovskite Phases of MgSiO₃
AU: * Stackhouse, S
EM: s.stackhouse@ucl.ac.uk
AF: Department of Earth Sciences, University College London Gower Street, London, WC1E 6BT United Kingdom
AU: Brodholt, J P
EM: j.brodholt@ucl.ac.uk
AF: Department of Earth Sciences, University College London Gower Street, London, WC1E 6BT United Kingdom
AU: Price, G D
EM: d.price@ucl.ac.uk
AF: Department of Earth Sciences, University College London Gower Street, London, WC1E 6BT United Kingdom
AB: Knowledge of how iron affects the properties of mantle minerals is essential for the understanding of fundamental deep Earth processes. We have, therefore, used ab initio methods to examine the properties of ferric and ferrous iron bearing perovskites and post-perovskites. In particular, we have looked at the pure FeSiO₃ end-members as well as phases containing 6 and 12 percent iron. We have paid particular care in constraining the correct spin state as a function of pressure, since we have found that the spin state is sensitive to small amounts of non-hydrostatic strain. The results of these calculations and implications for the mantle are presented.
UR: http://www.es.ucl.ac.uk/research/desmond/
DE: 3909 Elasticity and anelasticity
DE: 3924 High-pressure behavior
SC: Mineral and Rock Physics [MR]
MN: Fall Meeting 2005