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Long-term weathering of silicates in a sandy soil at Nordmoen, southern Norway

Published online by Cambridge University Press:  09 July 2018

S. Teveldal ,
P. Jørgensen  and
A. O. Stuanes
S. Teveldal
Affiliation:
Norwegian Forest Research Institute, PO Box 61, N-1432 Ås-NLH, Norway
P. Jørgensen
Affiliation:
Department of Soil Sciences, Agricultural University of Norway, PO Box 28, N-1432 Ås-NLH, Norway
A. O. Stuanes
Affiliation:
Norwegian Forest Research Institute, PO Box 61, N-1432 Ås-NLH, Norway
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Abstract

Weathering processes have been studied in a podzol profile developed on sand during a postglacial period of 9400 years. Due to disintegration of rock fragments, the particle-size distribution has changed markedly in the upper part of the profile, and minerals have been transferred from sand fractions to silt and clay fractions. The most important weathering processes are the total breakdown of trioctahedral chlorite and biotite, and the transformation of dioctahedral mica (muscovite-phengite) to a regularly interstratified mineral, and further to Al-vermiculite or smectite. By using quartz as an internal standard, the annual loss due to weathering was found to be 3·2 g/m2. The release of elements due to silicate weathering was calculated from depletion curves, and the average annual release of Na + K + Mg + Ca for the postglacial period was 19 mEq/m2.

Type
Research Article
Information
Clay Minerals , Volume 25 , Issue 4 , December 1990 , pp. 447 - 465
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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