Computer Science
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esrv...29..309m&link_type=abstract
Earth Science Reviews, Volume 29, Issue 1-4, p. 309-320.
Computer Science
1
Scientific paper
This paper outlines micromechanical aspects that need to be addressed in any investigation of dislocation-enhanced selective dissolution (DESD). Dislocations are first examined as static microstructures. A review of configurational energetics reveals that dislocation microstructure is responsible for energetic variations of the same order of magnitude as that calculated for dislocation density and thus should be included explicitly in energetic expressions of dissolution. It is proposed that DESD can be most effective on a microstructure that consists of an extreme gradient in the density of free dislocations. A review of well established principles of dislocation dynamics suggest that this DESD microstructure is associated with relatively low homologous temperature and stress. As a consequence, it is proposed that the DESD microstructure and thus the most favorable conditions for the DESD mechanism can occur across a wide range of depths in the earth's crust, dependent on the mineral assemblage. The present inability to more precisely define the boundary conditions of this DESD field for any particular mineral is attributed to the lack of experimental values for the appropriate parameters, such as dislocation activation stress. Experiments designed to evaluate dislocation activation stresses are outlined. It is also proposed that the potential for macroscopic textural differences between DESD and elastic strain controlled dissolution can be investigated qualitatively through computer simulation based on grain scale distinctions between sites of dissolution brought about by DESD and elastic mechanisms.
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