GEOCHEMISTRY OF SULFUR ISOTOPES IN VARIOU S TYPES OF SULFIDE METALLIZATION OF THE YOKO-DOVYREN MASSIF (NORTH TRANSBAIKALIA)

On the basis of 45 original determinations and generalization of the d ata of previous studies, the peculiarities of sulfur isotopes in vario us genetic types of sulfide metallization within the Yoko-Dovyren duni te-troctolite-gabbroic massif are considered. The main attention is pa id to the characteristics of the isotopes of industrially important su lfide Cu-Ni ores of the Baikal Deposit and of the low-sulfide platinum -metal metallization, for which isotopic data have been first obtained . It has been established that the sulfides of the lower platiniferous horizon are close in the average isotopic composition of sulfur to th e Cu-Ni ores of the Baikal Deposit, which indicates the same, probably , juvenile source of sulfur far these types of metallization. The grea t delta(34)S variations within the platiniferous horizons are explaine d by the isotopic fractionation caused by the SO2 removal at different oxygen fugacities.