Interdiffusion of K and Na in alkali feldspars; homogenization experiments

An "average" interdiffusion coefficient (D) is between 2 and 4 × 10-17 cm2/sec for a synthetic cryptoperthite at 600°C in the composition range Or23-Or53, and between 6 and 12 × 10-16 cm2/sec for a natural cryptoperthite at 650°C in the composition range Or0-Or85. Finite-difference models...

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Bibliographic Details
Published in:The American mineralogist 1983-02, Vol.68 (1-2), p.106-111
Main Authors: Brady, John B, Yund, Richard A
Format: Article
Language:English
Subjects:
alkali feldspar
alkali metals
crystal chemistry
diffusion
experimental studies
exsolution
feldspar group
finite difference analysis
framework silicates
geochemistry
homogenization
lamellae
metals
mineral data
Mineralogy
minerals
potassium
processes
silicates
sodium
statistical analysis
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Summary:An "average" interdiffusion coefficient (D) is between 2 and 4 × 10-17 cm2/sec for a synthetic cryptoperthite at 600°C in the composition range Or23-Or53, and between 6 and 12 × 10-16 cm2/sec for a natural cryptoperthite at 650°C in the composition range Or0-Or85. Finite-difference models are in good agreement with our experimental results.—Modified journal abstract.
ISSN:0003-004X
1945-3027