Abstract
Two profiles of weakly podzolised, well drained soils of abraded moraine plains in northwestern Russia are studied. The profiles are located at the edges and on the upper parts of slopes. They are developed upon two-layered rocks: stony sand-sandy loam deposite of complex genesis, underlain with reddish brown bouldery moraine loam. This determines a clear differentiation of the profile in terms of particle size distribution and bulk chemical composition, and also in terms of the mineralogical composition of the clay fraction.
In the lower deposit, a subfraction of water-dispersed clay dominates: dioctahedral illite, kaolinite with admixture of disorderd mixed lattice illite-smectites with domination of illite packets. In the upper deposit, the fraction of water-aggregated silt increases; clay fraction contains larger amounts of kaolinite, as well as dioctahedral illite, ordered and disordered mixed lattice illite-smectite and illite-vermiculite minerals, chlorite, and, probably, vermiculite.
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Original Russian Text © E.I. Gagarina, T.A. Sokolova, E.Yu. Sukhacheva, 2014, published in Vestnik Moskovskogo Universiteta. Pochvovedenie, 2014, No. 4, pp. 3–12.
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Gagarina, E.I., Sokolova, T.A. & Sukhacheva, E.Y. Clay minerals in weakly podzolised soils of abraded moraine plains in northwestern Russia. Moscow Univ. Soil Sci. Bull. 69, 147–155 (2014). https://doi.org/10.3103/S0147687414040048
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DOI: https://doi.org/10.3103/S0147687414040048