Computer Science
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.3347m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 12, pp.3347-3352
Computer Science
Scientific paper
Investigations of dislocation enhanced selective dissolution rarely consider the consequences of dislocation dynamics. The purpose of this work is to point out its significance. A strain energy inventory of a variety of dislocation configurations (microstructure) exposes energetic variations of the same order of magnitude as that calculated for dislocation density. Therefore, experiments that lack microstructural control could obscure the observable relationships between dislocation density and reaction rate. The inventory associates free dislocations with the greatest strain energy per unit line length. Dynamical considerations suggest that low homologous temperature and shear stress favor the tangles of free dislocations that most effectively enhance selective dissolution. Conversely, crystals that exhibit the greatest macroscopic strain lose their potential for dissolution. A comparison of micromechanical properties indicates that dislocation enhanced dissolution can occur across a wide range of crustal depths, dependent upon the mineral assemblage.
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