Abstract
A dependence of the magnetic susceptibility (κ) on the alternation of paleosol and loess has been revealed for loess sections of southern Tajikistan: the κ value increases in paleosols and decreases in loesses. The magnetic signal intensification in the paleosol is caused by an elevated content of ferromagnetics. New electron-microscopic data on magnetic minerals from the paleosol have demonstrated that the principal ferromagnetic responsible for high κ values of the paleosol is biogenic fine-dispersed magnetite. Its particles vary from 0.0n to 0.n μm in size and exhibit crystallochemical characteristics typical for this mineral. Under pedogenetic conditions and participation of Fe-reducing bacteria, the activity of biomineralization is controlled by paleoclimatic variations.
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