Abstract <p>The paper presents the results of petrological, mineralogical and geochemical studies of igneous rocks from the subvolcanic gabbro-diorite intrusion and host volcanics of the Aginskoe gold–silver–telluride deposit located in the Central Kamchatka volcanic belt. Igneous rocks connected by multiple mutual transitions are represented by gabbro, gabbro-diorites, diorites, quartz diorites, and granites. In terms of composition, the rocks correspond to moderate- and high-potassium calc-alkaline petrochemical series. The host volcanics are comagmatic with the intrusive rocks. The main fluorine and chlorine concentrating minerals in igneous rocks are biotite and apatite. Apatites are essentially fluorine with a reduced content of chlorine. The Aginsky gabbro-diorite massif is a complex multiphase intrusion formed in an island-arc geodynamic setting. The formation of intrusive phases occurred in the temperature range 450–1300°C and was accompanied by a decrease of chlorine contents and accumulation of fluorine at intensive degassing of the magmatic melt.</p>