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Grain Boundary and Diffusion Metasomatism
Robert F. Sippel and Manus R. Foster
The Journal of Geology
Vol. 71, No. 2 (Mar., 1963), pp. 251-255
Published by: The University of Chicago Press
Stable URL: http://www.jstor.org/stable/30066156
Page Count: 5
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Grain boundary and surface diffusion are considered as possible means for extending the range of solid diffusion in metasomatic processes. A mathematical model of a granular solid is proposed, and an asymptotic (large-time) solution for diffusion in this system is obtained, giving the distribution of solute as a function of distance and time. It is assumed that both lattice and grain boundary diffusion are operative, and that unit concentration is maintained at the free surface of the solid for all time. The solution strongly suggests that surface and grain boundary diffusion cannot greatly extend the range of solid diffusion over that obtained by strictly lattice mobility.
The Journal of Geology © 1963 The University of Chicago Press