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The clay mineral composition of four brown forest soil profiles (Luvisols) developed on different parent rocks was studied in detail to determine the major clay mineral alteration processes. In the studied profiles a siltstone bedrock weathered to chlorite/vermiculite and vermiculite in a less developed, shallow soil profile, while the major product of soil formation in a clayey, well-developed deep soil is a typical soil montmorillonite with heterogeneous charge distribution. The most possible pathway of clay alteration is illite smectitization via charge reduction, and considerable degradation of smectite in the soil formed on limestone. On the contrary, weathering of andesite parent rock involves the formation of low charged smectite altering to high charged vermiculite during pedogenesis.

Characterization of Clay Minerals in Brown Forest Soil Profiles (Luvisols) of the Cserhát Mountains (North Hungary)