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- W2588778325 abstract "Anstn,c.cr Diffusional exchange between the wedge-shaped terminations of fine-scale, coherent exsolution lamellae and the large flat sides of adjacent like lamellae is proposed as the principal mechanism for the coarsening of lamellar exsolution textures in silicate minerals. Following the methods of Gibbs (1906), a formula is derived for the chemical potential gradients due to interfacial energy effects that drive the proposed diffusion and coarsening. The calculated driving force is shown to be inversely proportional to the lamellar wavelength (I), as obtained by Cline (197l) for a similar geometry. For this model of lamellar coarsening, the appropriate rate law is given by tr: : )3 + kt rather than the rate law 6: lo + ktv') that applies to the coarsening of more equidimensional precipitates (Wagner, l96l). For geologic problems, extrapolation ofthe data oflaboratory coarsening experiments using the tr'? rate law yields results significantly different from those obtained using the t'h rate law, if the coarsening event lasts more than a few hundred years. The rate of coarsening, according to the proposed model, depends on the two-dimensional density of wedge-shaped ends (WSE), i.e., their number per unit cross-sectional area (n*.u). Measurements ofrnu photos ofclinopyroxenes, exsolved and coarsened at 1000C by Nord and McCallister (1979), give WSE densities in the range I x l0'2 to 15 x l0'2 m-2. The product trn*r. should be constant during coarsening and has been determined to be in the range I x 105 to 5 x lOt m-r for the same exsolved clinopyroxenes." @default.
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- W2588778325 date "1987-08-01" @default.
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- W2588778325 title "Coarsening of fine-scale exsolution lamellae" @default.
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