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Physics and Chemistry of Minerals

, Volume 43, Issue 2, pp 119–126 | Cite as

Si and O self-diffusion in hydrous forsterite and iron-bearing olivine from the perspective of defect chemistry

  • Hongzhan Fei
  • Tomoo Katsura
Original Paper

Abstract

We discuss the experimental results of silicon and oxygen self-diffusion coefficients in forsterite and iron-bearing olivine from the perspective of defect chemistry. Silicon diffusion is dominated by VO ··-associated VSi″″, whereas oxygen diffusion is dominated by hopping of VO ·· under anhydrous conditions, and by (OH)O · under hydrous conditions. By considering the charge neutrality condition of [(OH)O ·] = 2[VMe″] in hydrous forsterite and iron-bearing olivine, we get D Si ∝ (\(C_{{{\text{H}}_{2} {\text{O}}}}\))1/3 and D O ∝ (\(C_{{{\text{H}}_{2} {\text{O}}}}\))0, which explains the experimental results of water effects on oxygen and silicon self-diffusion rates (Fei et al. in Nature 498:213–215, 2013; J Geophys Res 119:7598–7606, 2014). The \(C_{{{\text{H}}_{2} {\text{O}}}}\) dependence of creep rate in the Earth’s mantle should be close to that given by Si and O self-diffusion coefficients obtained under water unsaturated conditions.

Keywords

Defect chemistry Water content Silicon Oxygen Self-diffusion coefficient Forsterite 

Notes

Acknowledgments

This work is supported by the Research Grant by the German Research Foundation (DFG) to T. Katsura (KA 3434/3-1) and by the postdoctoral fellowship for oversea researchers from Japan Society for the Promotion of Science (JSPS) to H. Fei (25003327).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Institute for Study of the Earth’s InteriorOkayama UniversityMisasaJapan
  2. 2.Bayerisches GeoinstitutUniversity of BayreuthBayreuthGermany

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