Sulphur isotope composition of the sandstone-lead deposits in southern Norway.
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Samples of galena, pyrite and barite from the Norwegian sandstone-lead occurences in the Gjøvik area and at Osen and Galåa have been analyzed for their sulphur isotope composition. Samples from the Vassbo and Laisvall deposits in Sweden were also analyzed. The galena samples are characterized by a large variation in the sulphur isotopic composition (+10 to +16%.) and they have an average d34S composition of +18,56%. The sulphur source has earlier been interpreted to be oil-field waters, and these data are not inconsistent with this interpretation. However, the data also permit, as an alternative source for the sulphur, sea-water sulphate locally reduced by bacteria.