The measurement, understanding, and application of diffusion-related processes have made great advances in recent years following a period that started in the 1950s and 1960s when systematic efforts were begun to understand the role of diffusion in geosystems evolution. Improvements in analytical and experimental tools within the past quarter century, and especially in the last decade, have made a large body of diffusion data available for minerals, glasses, and melts of varying composition under various pressure, temperature, and volatile fugacity (e.g., fO2, fH2O) conditions. Diffusion in various kinds of discontinuities (e.g., grain boundaries...

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