Diffusion Data for Silicate Minerals, Glasses, and Liquids

Diffusion is an integral part of many geologic processes and an increasing portion of the geologic literature is devoted to the measurement, estimation, and application of diffusion data. This compilation is intended to be a guide to recent experimentallydetermined diffusion coefficients and, through the papers cited, to important older literature. To provide a context for the tables, a brief summary of the equations required for a phenomenological (macroscopic) description of diffusion follows. Although the equa tions for well-constrained experiments are relatively straightforward, the application of the resulting diffusion coefficients to complex geologic problems may not be straightforward. The reader is urged to read one or more diffusion texts [e.g., 99, 121, 32, 147, 13.51 before attempting to use the data presented here.