No effect of water on oxygen self-diffusion rate in forsterite

Hongzhan Fei; Michael Wiedenbeck; Daisuke Yamazaki; Tomoo Katsura

doi:10.1002/2014JB011141

No effect of water on oxygen self-diffusion rate in forsterite

Hongzhan Fei, Michael Wiedenbeck, Daisuke Yamazaki, Tomoo Katsura

Institute for Planetary Materials

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19 Citations (Scopus)

Abstract

We systematically measured oxygen self-diffusion coefficients (DO) in forsterite along b crystallographic axis at a pressure of 8 GPa and temperatures of 1600-1800 K, over a wide range of water content (CH₂O) from 1 up to ~800 weight ppm. The experimental results suggest that DOα(CH₂O)^0.05±0.06 ≈ (CH₂O)⁰. Thus, water has no significant effect on oxygen self-diffusion rate in forsterite. Since the CH₂O dependence of silicon self-diffusion rate is also very small, the effect of water on olivine rheology is not significant by assuming the diffusion controlled creep mechanism.

Original language	English
Pages (from-to)	7598-7606
Number of pages	9
Journal	Journal of Geophysical Research: Solid Earth
Volume	119
Issue number	10
DOIs	https://doi.org/10.1002/2014JB011141
Publication status	Published - Oct 2014

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ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science

Cite this

Fei, H., Wiedenbeck, M., Yamazaki, D., & Katsura, T. (2014). No effect of water on oxygen self-diffusion rate in forsterite. Journal of Geophysical Research: Solid Earth, 119(10), 7598-7606. https://doi.org/10.1002/2014JB011141

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abstract = "We systematically measured oxygen self-diffusion coefficients (DO) in forsterite along b crystallographic axis at a pressure of 8 GPa and temperatures of 1600-1800 K, over a wide range of water content (CH2O) from 1 up to ~800 weight ppm. The experimental results suggest that DOα(CH2O)0.05±0.06 ≈ (CH2O)0. Thus, water has no significant effect on oxygen self-diffusion rate in forsterite. Since the CH2O dependence of silicon self-diffusion rate is also very small, the effect of water on olivine rheology is not significant by assuming the diffusion controlled creep mechanism.",

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10.1002/2014JB011141