Mineralogical composition of clay fraction from Romanian argillic brown soils
1996
Craciun, C. (Institutul de Cercetari pentru Pedologie si Agrochimie, Bucharest (Romania))
The mineralogical investigation of Romanian argilic brown soils from 22 profiles using instrumental analysis methods (X-ray diffraction, infrared spectroscopy, thermal analysis) made evident the presence of smectite, illite, kaolinite and sometimes interstratifications and lepidocrocite. Between lower (B and C horizons) and upper (A and AB horizons) part of profiles, the quantitative mineralogical differences could be observed. The dominant minerals in the lower part of the profile were smectite, which showed a decreasing tendency to the upper part of the profile. The illite minerals indicated an opposite tendency in their distribution inside the profile. The smectite content of parent material (average value) showed an increasing tendency: argilic podzolic soil-podzolic brown soil-argillic brown soil. This order is in agreement with those which refer to Ca increased frequency and Mg-rich deposits in parental material. The chloritization frequency process decreased in the same order. As regards the investigated soils, chlorite-like minerals were not identified.
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