Fe-Mg Interdiffusion in (Mg,Fe)SiO 3 Perovskite and Lower Mantle Reequilibration-Reference-Cited by-同舟云学术

Fe-Mg Interdiffusion in (Mg,Fe)SiO 3 Perovskite and Lower Mantle Reequilibration

Published:2005-09-09 Issue:5741 Volume:309 Page:1707-1710
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Holzapfel Christian¹²,Rubie David C.¹²,Frost Daniel J.¹²,Langenhorst Falko¹²

Affiliation:

1. Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany.

2. Friedrich-Schiller-Universität Jena, Institut für Geowissenschaften, Burgweg 11, D-07749, Germany.

Abstract

Fe-Mg interdiffusion coefficients for (Mg,Fe)SiO 3 perovskite have been measured at pressures of 22 to 26 gigapascals and temperatures between 1973 and 2273 kelvin. Perovskite Fe-Mg interdiffusion is as slow as Si self-diffusion and is orders of magnitude slower than Fe-Mg diffusion in other mantle minerals. Length scales over which chemical heterogeneities can homogenize, throughout the depth range of the lower mantle, are limited to a few meters even on time scales equivalent to the age of Earth. Heterogeneities can therefore only equilibrate chemically when they are stretched and thinned by intense deformation.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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