The paper discusses the physico-chemical formation conditions of minerals-pheno-crysts in basaltic complexes, which host massive sulfde deposits of the Urals and Siberia. It is found as a result of study of melt inclusions that clinopyroxene from basalts of the Valentorka (North Urals) and Kyzyl-Tashtyg (South Siberia) deposits crystallized from melts with similar temperature (1165–1130 and 1210–1085 °С, respectively) and chemical parameters. In both cases, the composi¬tions of basalt-andesite magmas (with features of igneous island arc and back-arc basin systems) evolved with a decrease in FeO, MgO, and CaO contents and increase in K2O and SiO2 contents. Modeling, which is based on the compositions of inclusions and clinopyroxene, showed that miner-als-phenocrysts crystallized from intermediate magma chambers of diferent depth, the parameters of which are consistent with each other and with data on present-day suprasubduction magmatism: Valentorka deposit – 33–27, 23–13, and 10–3 km, 1185–1090 °C; Kyzyl-Tashtyg deposit – 27–20, 15.0–6.7, and 5.0–1.7 km, 1215–1105 °С. Calculations using compositions of melt inclusions show a consistent change of melts from basalts to rhyolites, indicating that the combination of contrasting volcanic complexes of the deposits studied are a result of the evolution of initial basaltic magmas during their uplift to the upper crustal horizons. Our studies of rocks, clinopyroxene and melt inclu¬sions indicate that the basaltic complexes of the Valentorka and Kyzyl-Tashtyg deposits formed in an ancient suprasubduction island arc – back-arc basin system.

Key words: conditions of mineral crystallization, basaltic complexes, massive sulfde deposits, clinopyroxene, melt inclusions.

V.A. Simonov, Sobolev Institute of Geology and Mineralogy SB RAS, pr. Akademika Koptyuga 3, Novosibirsk, 630090
Russia; zima.simonova1989@yandex.ru, simonov@igm.nsc.ru
Novosibirsk National Research State University, ul. Pirogova 1, Novosibirsk, 630090 Russia
Kazan Federal University, ul. Kremlevskaya 18, Kazan, 420008 Russia

V.V. Maslennikov, South Urals Federal Research Centre of Mineralogy and Geoecology UB RAS, Institute of Mineralogy,

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