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Clay formation and podzol development from postglacial moraines in Switzerland

Published online by Cambridge University Press:  09 July 2018

D. Righi ,
K. Huber  and
C. Keller
D. Righi
Affiliation:
UMR CNRS 6532 ‘Hydrogéologie, Argiles, Sols et Altérations’ Faculté des Sciences, 86022 Poitiers Cedex, France
K. Huber
Affiliation:
IATE/P-Pédologie, Département de Génie Rural, EPFL, 1015 Lausanne
C. Keller
Affiliation:
Génie Sanitaire, Ecublens, EPFL, 1015 Lausanne, Switzerland
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Abstract

The fine silt (2–5 μm) and fine clay (<0.1 μm) fractions from four acid soils developed from moraines of increasing age (80, 400, 3,000 and 6,500 years old) in Switzerland, were studied by X-ray diffraction and chemical analyses. The soil parent material is homogeneous at the four sites and the soils can be considered as forming a chronosequence of soil development leading to the formation of Podzols. Mineralogical evolution of silt-sized phyllosilicates and fine clay fractions follows different pathways according to their composition and the soil horizon in which they are located. Dioctahedral and trioctahedral minerals in the soil parent material were both weathered in the Bw and Bs horizons but the trioctahedral phase more strongly and faster than the dioctahedral one. Weathering products are mica-vermiculite mixed-layers, vermiculite and finally gibbsite and Fe oxy-hydroxides. Weathering of the trioctahedral fraction was faster in the eluvial A or E horizons than in the B horizons, being almost complete after 3,000 years of soil development. Appreciable weathering of the dioctahedral fraction occurs only in the eluvial horizons leading to the formation of mica-smectite mixed-layers and smectite. Although smectite has been reported in the E horizon of Podzols in different environments, the significant finding in this work is the presence of this mineral in soils developed from the same parent material. This supports the fact that smectite is the end- product of mica alteration in strongly leached and acidified E horizons of Podzols.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 2 , June 1999 , pp. 319 - 332
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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