Deformation of (Mg,Fe)SiO 3 Post-Perovskite and D'' Anisotropy-Reference-Cited by-同舟云学术

Deformation of (Mg,Fe)SiO 3 Post-Perovskite and D'' Anisotropy

Published:2007-06-22 Issue:5832 Volume:316 Page:1729-1732
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Merkel Sébastien¹²³⁴⁵,McNamara Allen K.¹²³⁴⁵,Kubo Atsushi¹²³⁴⁵,Speziale Sergio¹²³⁴⁵,Miyagi Lowell¹²³⁴⁵,Meng Yue¹²³⁴⁵,Duffy Thomas S.¹²³⁴⁵,Wenk Hans-Rudolf¹²³⁴⁵

Affiliation:

1. Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA.

2. Laboratoire de Structure et Propriétés de l'Etat Solide, UMR CNRS 8008, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq, France.

3. School of Earth and Space Exploration, Arizona State University, Box 871404, Tempe, AZ 85287–1404, USA.

4. Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.

5. High-Pressure Collaborative Access Team, Carnegie Institution of Washington, Argonne, IL 60439, USA.

Abstract

Polycrystalline (Mg 0.9 ,Fe 0.1 )SiO 3 post-perovskite was plastically deformed in the diamond anvil cell between 145 and 157 gigapascals. The lattice-preferred orientations obtained in the sample suggest that slip on planes near (100) and (110) dominate plastic deformation under these conditions. Assuming similar behavior at lower mantle conditions, we simulated plastic strains and the contribution of post-perovskite to anisotropy in the D″ region at the Earth core-mantle boundary using numerical convection and viscoplastic polycrystal plasticity models. We find a significant depth dependence of the anisotropy that only develops near and beyond the turning point of a downwelling slab. Our calculated anisotropies are strongly dependent on the choice of elastic moduli and remain hard to reconcile with seismic observations.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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