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Ostwald ripening and interparticle-diffraction effects for illite crystals

American Mineralogist
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Abstract

The Warren-Averbach method, an X-ray diffraction (XRD) method used to measure mean particle thickness and particle-thickness distribution, is used to restudy sericite from the Silverton caldera. Apparent particle-thickness distributions indicate that the clays may have undergone Ostwald ripening and that this process has modified the K-Ar ages of the samples. The mechanism of Ostwald ripening can account for many of the features found for the hydrothermal alteration of illite. Expandabilities measured by the XRD peak-position method for illite/smectites (I/S) from various locations are smaller than expandabilities measured by transmission electron microscopy (TEM) and by the Warren-Averbach (W-A) method. This disparity is interpreted as being related to the presence of nonswelling basal surfaces that form the ends of stacks of illite particles (short-stack effect), stacks that, according to the theory of interparticle diffraction, diffract as coherent X-ray scattering domains. -from Authors

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Ostwald ripening and interparticle-diffraction effects for illite crystals
Series title American Mineralogist
Volume 73
Issue 11-12
Year Published 1988
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title American Mineralogist
First page 1335
Last page 1345
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