Weathering of Feldspars in Iron-Illuvial Podzols of Different Ages (by the Example of Western Keivy,The Kola Peninsula)

摘要

The different intensity of feldspar grains weathering in eluvial horizons of Al-Fe-humus podzols was recorded in a chronosequence.The use of a scanning electron microscope makes it possible to reveal initial stages of slective dissolution of mineral grains:formation of shallow cavities on the surface;shearing of corroded surface,along with outcropping of unweathered layers.Analysis of morphological and physicochemical properties of soils in the chronosequence and of the surface morphostructure of feldspar grains has made it possible to reconstruct paleoclimatic conditions and to reveal tendencies in soil evolution in the valley of Lake Tapperiok.