PHYSICAL-CHEMICAL CONDITIONS OF STABILITY FOR Li-Fe MICAS IN RARE-METAL GRANITES

摘要

Methods of chemical thermodynamics allow to appraise for Li-Fe micas in rare-metal granites of Eastern Transbaikalia the probability of their forming within the postmagmatic process regime. Estimation of influence of temperature, pH, activities of participating ions upon stability of biotite, protolithionite, zinnwaldite, lepidolite, muscovite has shown that the mere formation of these micas corresponds to the concept of multiphase postmagmatic transformation of the granites, with repeated conversion of mineral-forming media.