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A Mössbauer study of biotite weathering

Published online by Cambridge University Press:  05 July 2018

C. M. Rice  and
J. M. Williams
C. M. Rice
Affiliation:
Department of Geology, University of Sheffield, Sheffield, England
J. M. Williams
Affiliation:
Department of Physics, University of Sheffield, Sheffield, England
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Summary

Fresh and weathered biotites have been studied using Mössbauer, chemical, and X-ray analytical techniques. In the Mössbauer spectra the complete interference of both low-spin ferric lines by one of the high-spin ferrous lines and the existence of high-spin ferric iron in the weathered biotite has been demonstrated. In view of this interference, which appears to be common, allowances must be made in spectral interpretation if chemical analysis reveals ferric iron to be present in detectable amounts. Hypothetical extension of the weathering trends observed suggests that high-spin ferric iron is the only stable iron species in the end product.

During weathering marked loss of ferrous iron occurs, whereas the ferric iron content remains approximately constant. As a result of the instability of ferrous iron in the weathering environment there is a significant rearrangement of the octahedral layer.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 286 , June 1969 , pp. 210 - 215
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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Footnotes

1

Present address: Physik-Department der Technischen Hochschule München, 8 München 2, Arcisstrasse 21, Germany.

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