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Identification of oxide impurity phases and distribution of structural iron in some diagenetic illitic clays as determined by Mössbauer spectroscopy

Published online by Cambridge University Press:  09 July 2018

B. A. Goodman  and
P. H. Nadeau
B. A. Goodman
Affiliation:
The Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB9 2QJ, Scotland
P. H. Nadeau
Affiliation:
The Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB9 2QJ, Scotland
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Abstract

Seven diagenetic illitie clays have been investigated by Mössbauer spectroscopy to characterize the forms of iron. Four specimens had measurable amounts of iron oxide impurity phases, accounting for up to ∼95% of the total Fe. Goethite, microcrystalline and probably aluminous, was identified as the oxide phase in three of these samples, the other containing hematite. This latter sample was also the only one which had tetrahedral Fe(III). Five of the samples contained measurable amounts of Fe(II), but the aluminosilicate Fe was present largely as 6-coordinated Fe(III) which had two distinctly different sets of parameters. These results are discussed in terms of the structural properties of illites.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 3 , September 1988 , pp. 301 - 308
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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