[On the smectite-like minerals from Romanian soils]
1997
Gata, Gh. | Lazar, C. (Institutul de Cercetari pentru Pedologie si Agrochimie, Bucuresti (Romania))
The soil and lithological formation smectite-like minerals are expandable minerals with a less number and intensity of the basal diffraction lines and less crystalinity indices than montmorillonite. The Id index, the inverse of the width at the half height of the (001) peak, is proportional to the particle mean dimension. Its potassium, calcium and calcium glicolared-saturated smectite values present high correlation coefficients in the range 0,77-0,85 for 202 samples. The Ib index, the Biscaye ratio, present the same proportionality between their potassium, calcium and calcium glicolared saturared smectite values with r in the range 0,84 and 0,85 for 202 samples. For the same monoionic interlayer cation the correlation coefficients betwen Id and Ib are in a lower range (n=0,33-0,59) for the 202 samples. These properties suggest that the two indices include the orrdering elements but in different porportions. The repartition of the smectite-like minerals in Romanian soils is depending on the mineralogical heritage on pedological processes in soils: bioaccumulation of potassium with eventual transformation smectite-illite, the clay mineral oxidation in the surface horizon and translocation of smectite together clay fraction from A to Br.
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