Abstract
Clay mineralogy in three yellow-podzolic soil profiles was examined, using X-ray diffraction and thermogravimetric techniques. Chlorite-vermiculite intergrades and kaolinite were found to make up the great proportion of the clay fraction in podzolized horizons, whereas illite, smectite and metahalloysite predominated in the lower part of each solum. Destruction of swelling minerals and metahalloysite together with degradation of illite, and chloritization of 2:1 silicates are suggested as being responsible for profile differentiation of the main clay minerals.
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