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Clay mineral transformations in podzolized tills in central Finland

Published online by Cambridge University Press:  09 July 2018

D. Righi ,
M. L. Räisänen  and
F. Gillot
D. Righi
Affiliation:
URA 721 CNRS, Hydrogéologie, Argiles, Sols et Altérations, Faculté des Sciences, 86022 Poitiers Cedex, France
M. L. Räisänen
Affiliation:
Geological Survey of Finland, Geochemistry Department, PO Box 1237, 70211 Kuopio, Finland
F. Gillot
Affiliation:
URA 721 CNRS, Hydrogéologie, Argiles, Sols et Altérations, Faculté des Sciences, 86022 Poitiers Cedex, France
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Abstract

Transformations of clay minerals were studied in a sequence of podzols (Entic Cryorthods) of increasing age (5500-10000 years BP) developed from till materials in central Finland. The age of the soils was estimated according to altitude above the present sea level, with reference to the age of ancient shorelines and the rate of land uplift. Clay minerals in fine (<0.1 µm), coarse (0.1-2 µm) clay and fine silt (2-5 µm) fractions were studied by X-ray diffraction. The layer charge of expandable minerals was estimated on the basis of their re-expansion with ethylene glycol following K-saturation and heating to 110°C Pedogenic transformations of clay minerals occur essentially in the E horizons of the podzols. Smectites and illite-smectite mixed-layers are the dominant clay minerals in the E horizons of soils older than 6500 years. The number of mixed-layers decreases with evolution of the soil, leaving a nearly pure smectite phase in the oldest soil (10000 years). The smectites are dioctahedral with a tetrahedral charge. Groups of low-charge and highcharge interlayers are both present in the samples, but low-charge smectite layers were found only in the two older soils (9500-10000 years). This suggests alteration with time of the high-charge smectites.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 4 , December 1997 , pp. 531 - 544
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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