Skład izotopowy siarki rodzimej ze złóż tarnobrzeskich

Abstract

ISOTOPE COMPOSITION OF NATIVE SULPHUR FROM TARNOBRZEG ORES Summary The results of isotope analysis of Miocene sulphides, native sulphur, and of secondary sulphides are given. Isotope content of sulphur from 10 samples of Miocene evaporites from various parts of Poland appears to be quite uniform, and all δS34 determinations are close to the value + 20‰ (in respect to meteoric sulphur). Isotopic composition of native sulphur appears to be more differentiated and majority of determinations cluster around the mean value, δS34≈ +11‰. Only the sulphur from peripheral parts of sulphur ore, directly adjoining gypsum series, shows marked impoverishment in isotope S34. The values δS34 for industrial sulphur vary from +6 to +16‰. Moreover, it was found that basal parts of the ore are poorer in isotope S34 than the top parts. Secondary sulphides, such as celestine, are remarkably enriched in the heavy isotope. Low content of these sulphides is typical of the Tarnobrzeg sulphur, which indicates that remarkable part of SO4-- enriched in S34 isotope may have been removed during gypsum reduction. The observed dependance of native sulphur isotope content on depth of occurrence indicates that gypsum reduction processes proceeded from the base upwards.