Elastic anisotropy of FeSiO3 end-members of the perovskite and post-perovskite phases -: art. no. L01304

被引：47

作者：

Stackhouse, S ^{[1
]}

Brodholt, JP ^{[1
]}

Price, GD ^{[1
]}

机构：

[1] UCL, Dept Earth Sci, London WC1E 6BT, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 2006年 / 33卷 / 01期

基金：

英国自然环境研究理事会;

关键词：

D O I：

10.1029/2005GL023887

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

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