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Ab initio study of the elastic behavior of MgSiO3 ilmenite at high pressure

Da Silva, CRS; Karki, BB; Stixrude, L; Wentzcovitch, RM; (1999) Ab initio study of the elastic behavior of MgSiO3 ilmenite at high pressure. Geophysical Research Letters , 26 (7) 943 - 946. 10.1029/1999GL900149. Green open access

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Abstract

We investigate the athermal high pressure behavior of the elastic properties of MgSiO3 ilmenite up to 30 GPa using the ab initio pseudopotential method. Our results at zero pressure are in good agreement with single-crystal elasticity measurements. The elastic anisotropy is shown to decrease slightly under compression and hence to remain substantial (25 to 20% shear wave anisotropy and 16 to 10% longitudinal wave anisotropy) over the pressure regime studied. The directions of fastest and slowest wave propagation are found to change slightly with pressure as determined by the pressure dependence of c(14) and c(25). Comparisons with the elastic behavior of other deep transition zone phases such as ringwoodite and garnet show that ilmenite is likely to be the fastest and most anisotropic mineral in this region. Large contrasts (approximate to 10%) in velocities and densities between ilmenite and garnet are suggested to be significant for the interpretation of lateral structure in the transition zone.

Type: Article
Title: Ab initio study of the elastic behavior of MgSiO3 ilmenite at high pressure
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/1999GL900149
Publisher version: http://dx.doi.org/10.1029/1999GL900149
Language: English
Additional information: Copyright 1999 by the American Geophysical Union
Keywords: X-ray-diffraction, Mantle, Heterogeneity, Phase, Constants, Garnet, Model
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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.ucl.ac.uk/id/eprint/86645
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