Abstract
A knowledge of the diffusion coefficients of the major atomic species in minerals is crucial to the understanding of the deformation mechanisms of rocks, and the calculation of their chemical kinetic behavior. Examples of diffusion-controlled properties include high-temperature creep (silicon diffusion is rate controlling in olivine, Jaoul et al, 1981), the kinetics of subsolidus reactions between minerals (the rate of growth of olivine between an “Si-poor-Fe, Mg-rich” phase like a spinel and an “Si-rich” enstatite is controlled by oxygen diffusion across the growing phase, Borchardt et al., 1979), and the re-equilibration of ion-exchange geothermometers during cooling (e.g., Lasaga, 1983; Ganguly and Saxena, 1987). Diffusion coefficients of interest in rock-forming minerals are sufficiently rapid in many cases to be measurable by conventional experimental techniques for the P-T range of geological interest, some of which have been discussed elsewhere within this volume. However, several diffusion processes of geological interest are too slow to be measured experimentally by the conventional techniques, and thus require high-resolution microanalysis of the diffusion profiles.KeywordsNuclear ReactionIncident EnergyIncident ParticleDiffusion ProfileIncident ProtonThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Published Version
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