Enhancement of Cation Diffusion Rates Across the 410-Kilometer Discontinuity in Earth's Mantle-Reference-Cited by-同舟云学术

Enhancement of Cation Diffusion Rates Across the 410-Kilometer Discontinuity in Earth's Mantle

Published:1999-01-15 Issue:5400 Volume:283 Page:362-365
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Chakraborty S.¹,Knoche R.¹,Schulze H.¹,Rubie D. C.¹,Dobson D.¹,Ross N. L.¹,Angel R. J.¹

Affiliation:

1. S. Chakraborty, Institut für Mineralogie und Geochemie, Universität zu Köln, Zülpicher Strasse 49B, 50674 Köln, Germany. R. Knoche, Institut für Mineralogie und Petrographie, Universität Innsbruck, Innrain 52, A-6020, Innsbruck, Austria. H. Schulze, D. C. Rubie, R. J. Angel, Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany. D. Dobson and N. L. Ross, Mantle Petrology Group, Department of Geological Sciences, University College London, Gower Street, London WC1E 6BT, UK.

Abstract

Rates of cation diffusion (magnesium, iron, and nickel) have been determined in olivine and its high-pressure polymorph, wadsleyite, at 9 to 15 gigapascals and 1100° to 1400°C for compositions that are relevant to Earth's mantle. Diffusion in olivine becomes strongly dependent on composition at high pressure. In wadsleyite, diffusion is one to two orders of magnitude faster than in olivine, depending on temperature. Homogenization of mantle heterogeneities (chemical mixing) and mineral transformations involving a magnesium-iron exchange will therefore occur considerably faster in the transition zone than at depths of less than 410 kilometers.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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