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Computer Simulation of Cation Distribution in Dioctahedral 2:1 Layer Silicates Using IR-Data: Application to Mössbauer Spectroscopy of a Glauconite Sample

Published online by Cambridge University Press:  28 February 2024

Lydia G. Dainyak ,
V. A. Drits  and
L. M. Heifits
Lydia G. Dainyak
Affiliation:
Geological Institute of the Russian Academy of Science, Moscow, Russia
V. A. Drits
Affiliation:
Geological Institute of the Russian Academy of Science, Moscow, Russia
L. M. Heifits
Affiliation:
Institute for Systems Studies of the Russian Academy of Science, Moscow, Russia
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Abstract

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A new approach is described to computer simulate cation distribution in octahedral sheets of dioctahedral 2:1 layer silicates with vacant trans-octahedra. This approach makes use of the information on cation distribution at the one-dimensional level provided by integrated IR optical densities for the region of OH-stretching frequencies. By using this program it is possible to show that (1) the Mössbauer spectrum of glauconite B. Patom conforms to the structural model composed of celandonite-like and illite-like domains whose dimensions are limited by approximately 2 or 4 unit cells; (2) non-equivalency of “left” and “right” cis-positions (with fixed b-direction) with respect to R2+ and R3+ occupancy is a characteristic feature of a celadonite-like domain.

Keywords

Cation distributionComputer simulationGlauconiteMössbauer spectra
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 4 , August 1992 , pp. 470 - 479
Copyright
Copyright © 1992, The Clay Minerals Society

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