Geologicheskii Vestnik

The features of mineralogy, petrography and geochemistry of basalt-andesite-rhyodacite volcanics of the Baimak massive sulfide-bearing complex, the youngest in the frontal island arc of Late Emsian age in the Southern Urals, are considered. New materials on the content of trace elements are used (analyses of ICP MS, CL IGM SB RAS, Novosibirsk) and microprobe definitions of the chemical composition of minerals (CL IG KarSC RAS, Petrozavodsk). Serial affinity of volcanites and questions of their petrogenesis are discussed. The rocks of this complex have an elevated magnesium, and are represented by a facial succession, including tephroid, effusive, pyroclastic, extrusive, subvolcanic and hypovolcanic rocks. Issues of classification of acid rocks and problems of their genesis are considered. It is supposed that at the effusive facies are represented by acid rocks — products of crystallization and fluid differentiation at the way of the melts to the Earth’s surface, and also by the hybrid rocks of dacite-rhyodacite composition which have arisen as a result of contamination of acid magmas by partially or completely crystallized gabbroids or basites of the previous stages of volcanism and by products of partial melting of basiс rocks of the lower crust. Specifics of volcanites of the Baimak complex are in the increased concentration and big amplitude of fluctuations of Ba, Pb and Au, both in the slightly modified rocks, and in the metasomatics of the nearore haloes.

Permian system, Kungurian stage, International Stratigraphic Scale, fusulinides, smaller foraminifers

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