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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
Stable URL: http://www.jstor.org/stable/30066156
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Grain Boundary and Diffusion Metasomatism
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Abstract

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.

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