Abstract
Tracerdiffusion coefficients D Fe* (and D Mg*) are presented for olivines of composition (Fe x Mg1−x )2SiO4 at T=1,130° C as a function of x, and oxygen activity, a O 2. Since the oxygen activity dependence of D Fe* (D Mg*) and that of the cation vacancy concentration are almost identical, it is concluded that a vacancy diffusion mechanism is operative in the octahedrally coordinated cation sublattices. From D Fe* and D Mg*, the chemical diffusion coefficient $$\bar D$$ can be calculated. The calculated $$\bar D$$ is in agreement with $$\bar D$$ -values obtained by Boltzmann-Matano analysis of interdiffusion experiments. In addition, correlation factors are evaluated from the tracerdiffusion data in order to calculate selfdiffusion coefficients.
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