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The results of petrology-geochemical and isotope studies of volcanic complexes of the Medvezhya caldera located in the northeast part of Iturup Island (Kuril Islands) have been presented. The duration and the polycyclic character of the caldera formation led to a wide variety of different-facies volcanits in composition from basalt to rhyolite. According to the relative concentrations of rock-forming oxides, lithophilic, highly charged, rare-earth elements and their ratios, rocks of various volcanic complexes of the Caldera Medvezhya belong to the low-potassium type of calc-alkaline series typical for the frontal zone of the Kuril Island Arc. Isotopic data on Nd and Sr indicate the genetic affinity of caldera volcanits and their origin from a single magmatic source. Petrochemical homogeneity is disturbed by the appearance of magnesian basalts uncharacteristic for the frontal zone of the Kuril Islands in the Late Holocene.

Petrochemical features of volcanic complexes of Medvezh’ya caldera (Iturup Island, Kuril Islands)