PETROLOGICAL FEATURES OF GRANITES OF THE VERKHOYAN-INDIGIRSKY AND PRIKOLYMA OROGENY ZONES ACCORDING TO THE DATA OF BIOTITES TYPOMORPHISM

Late Jurassic-Early Cretaceous hypabyssal granites of Verkhoyansk-Indigirka and Prikolyma orogenesis zones of the Yana-Kolyma folded region are well distinguished by petrological features. Sensitive indicator of this is the typomorphism of biotites, and the petrogenic and accessory minerals associated with them. Petrological features of Verkhoyansk-Indigirka orogenic zone granites are characterized by high water fluidity, low potassium alkalinity potential, normal and reduced alkalinity and crystallization at 520-680°C, and petrological features of the Kolyma zone characterized by low fluidity of water, high alkalinity, high oxidative potential of oxygen, its fugacity and crystallization of granites at high temperatures - 720-820°C. Petrogenesis of Verkhoyansk-Indigirka orogeny zone granites is determined by the lithosphere of the continental margin. More plastic viscous sandy-clayey strata of the Verkhoyansk folded thrust complex, saturated with juvenile waters are favorable for closed thermodynamic conditions for the formation of granite massifs, greisenization of apical domes with rare metal mineralization and polymetallic-gold ore mineralization in supra-intrusive aureoles. Petrological features of the granites of the Kolyma orogenetic zone are predetermined by the rigid tectonophysics of deeply metamorphosed crystalline strata of the early Proterozoic, Archean and contrast formed Phanerozoic terrigenous-carbonate deposits of continental lithosphere. Gold and polymetallic mineralization are developed in superintrusive halos.