Effect of H + on Fe-Mg interdiffusion in olivine, (Fe,Mg) 2SiO 4

Zhongyan Wang, Takehiko Hiraga, D. L. Kohlstedt

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Abstract

The quantification of the effect of hydrogen on the kinetics of Fe-Mg interdiffusion in olivine was discussed. It was found that diffusion couples composed of crystals with Mg/ (Mg+Fe) ratios of 0.91 and 0.83 were annealed under water-saturated conditions at T = 1373 K and P = 300 MPa. It was observed that the resulting interdiffusivity was approximately one order of magnitude larger thatn that measured under anhydrous conditions. Analysis shows that the enhancement in diffusivity in the presence of water results from an increase in the concentration of cation vacancies associated with the introduction of high concentrations of protons as point defects into the olivine structure.

Original languageEnglish (US)
Pages (from-to)209-211
Number of pages3
JournalApplied Physics Letters
Volume85
Issue number2
DOIs
StatePublished - Jul 12 2004

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