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

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.

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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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Correspondence to Hongzhan Fei.

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Fei, H., Katsura, T. Si and O self-diffusion in hydrous forsterite and iron-bearing olivine from the perspective of defect chemistry. Phys Chem Minerals 43, 119–126 (2016). https://doi.org/10.1007/s00269-015-0779-0

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Keywords

  • Defect chemistry
  • Water content
  • Silicon
  • Oxygen
  • Self-diffusion coefficient
  • Forsterite