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Influence of soil redox conditions on oxidation of biotite

Published online by Cambridge University Press:  09 July 2018

S. Bouda  and
K. P. Isaac
S. Bouda
Affiliation:
Department of Geology, University of Exeter, North Park Road, Exeter EX4 4QE
K. P. Isaac
Affiliation:
BP, Britannic House, Moor Lane, London ECY 9BU
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Abstract

Biotites from three peaty gleyed podzol soil profiles on ranite bedrock were examined to investigate the oxidation of the octahedral Fe during weathering. Oxidation of these biotites as determined by Mössbauer spectroscopy shows a good correlation with the in situ measured soil Eh values of the sampled horizons. In every soil profile the highest Eh measured is in the A horizon and the lowest in the C horizon. Similarly, biotites from the A horizons are the most oxidized compared with those from the lower horizons. In most of the samples the oxidation is accompanied by loss of K+ from the lattice, as demonstrated by a moderate degree of vermiculitization.

Type
Research Article
Information
Clay Minerals , Volume 21 , Issue 2 , June 1986 , pp. 149 - 157
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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