Strontium isotope ratio of certain ore-bearing magmatic associations in the Primorye as an indicator of their genesis

Strontium isotope composition in rocks of the most typical ore-bearing associations of the Primorye - Berezovsky volcano-plutonic complex and Dalninsky massif (Central massif) is studied. Both associations are bocated within the limits of the Main synclinorium of the Sikhote Alin, the first association being related to tin-polymetallic mineralization and the second - with tungsten one. The combination of high Rb/Sr and relatively low (87Sr/86Sr) ratios in rocks of the Berezovsky complex indicates that enrichment with potassium, rubidium and other lithophylic elements of the inantle region of magmageneration had taken place short time before magma fusion from it. The obtained data on the Central massif point to the isotopic homogeneity of the magmatic system from which granitoids have been formed. Geologopetrographic and geochemical data also confirm the assumption based on the obtained isotopic data that the primary melt is of subcrustal origin and has been contaminated with sial at the upper levels of the crust