Abstract
The Osnytskyi complex, located within the Volynskyi megablock of the Ukrainian Shield, is represented by gabbro-diorite-granodiorite-granite series and is a plutonic part of the KlesivskoOsnytska volcanic-plutonic association. Granitoid rocks of the Osnytskyi complex form a single formation of granites, which have a common spatial and structural origin. There are such types of granites as leptite-like, fine-grained, inequigranular-medium-grained, coarse-grained, etc. Petrographic, mineralogical and petrochemical studies of Osnytski inequigranular porphyraceous granites have been performed. Rock-forming (potassium feldspar, plagioclase, quartz, biotite and hornblende), accessory (zircon, apatite, titanite), ore (magnetite, ilmenite, pyrite) and secondary (epidote, sericite, chlorite, siderite, bastnäsite) minerals were identified and described. Biotite chemically corresponds to siderophyllite of magmatic origin (calcareous-alkaline orogenic complexes). Crystallization of the granites took place under conditions of low acidity at a temperature of ~ 760 °С and a sufficiently high pressure. Key words: granitoids, Osnytskyi complex, rock-forming, accessory, ore and secondary minerals, biotite, formation conditions, Volynskyi megablock, Ukrainian Shield
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