Аннотация:Evidence for an endogenic (metamorphic and/or metasomatic) origin of the phyllosilicates of these soils is presented. It is found that most minerals in each of the profiles studied are isostructural but have different layer charges due to defects and vacancies that appeared in their crystal lattices as a result of the heterogeneity of endogenic processes. It was found that current soil weathering leads to the destruction of phyllosilicates with charged layers and to a relative accumulation of phyllosilicates with zero-charged layers (serpentine and talc)in the upper soil horizons.