Stackhouse, S;
Brodholt, JP;
Price, GD;
(2006)
Elastic anisotropy of FeSiO3 end-members of the perovskite and post-perovskite phases.
Geophysical Research Letters
, 33
(1)
, Article L01304. 10.1029/2005GL023887.
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Abstract
The athermal elastic constants of the perovskite and post-perovskite polymorphs of pure end-member FeSiO3 were calculated from ab initio calculations. We predict that incorporating ten mole percent FeSiO3 together with four mole percent Al2O3 into MgSiO3 reduces the perovskite to post-perovskite phase transition pressure by 5 GPa. Small changes in the seismic properties of the post-perovskite phase due to the incorporation of iron and alumina are compatible with observations for the lower mantle. MgSiO3 post-perovskite enriched in fifty percent or more iron may be responsible for ultra-low velocity zones at the base of the mantle.
| Type: | Article |
|---|---|
| Title: | Elastic anisotropy of FeSiO3 end-members of the perovskite and post-perovskite phases |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1029/2005GL023887 |
| Publisher version: | http://dx.doi.org/10.1029/2005GL023887 |
| Language: | English |
| Additional information: | Copyright 2006 by the American Geophysical Union |
| Keywords: | Augmented-wave method, Core-mantle boundary, Earths lower mantle, Lowermost-mantle, Seismic anisotropy, MgSiO3 perovskite, High-pressure, D''-layer, Iron, Velocity |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/113009 |
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