Abstract
Redox conditions for the formation of igneous rocks determine the valence of variable valence elements. The ore mineral composition and amount, the magnetic fraction weight and the magnetic susceptibility of the rock and the composition of the dark-colored minerals depend on the ratio of Fe3+ and Fe2+. It is for the first time for more than 50 years of the redox conditions study that the he authors obtained detailed data on granitoid massifs located in the zone of redox conditions transition.
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