Other
Scientific paper
Nov 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962gecoa..26.1189g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 26, Issue 11, pp.1189-1207
Other
6
Scientific paper
The isotopic composition of sulfur in sulfides and sulfates (barite) from veins of Carboniferous to Permian age in the Black Forest (Germany) has been determined. The range of S isotope ratios is relatively narrow for each individual species and differs from one to another in spite of subsequent generations of mineralization. The differences however are too small to be explained as a simple sulflde-sulfate fractionation. Supposing that an equilibrium of fractionation in solution has been attained it can be suggested that this equilibrium must have been formed between sulfate and complex sulfide ions. Only the fractionation for the pair pyrite/barite (with pyrite values up to 34 S =-36·7 ) gives acceptable temperature values after the curves of Sakai. Therefore this pyrite seems to have been deposited from solutions with simple sulfide ions. As far as investigated, the Moldanubian crystalline rocks have produced ore solutions with almost uniform sulfur isotopic compositions for each of these ions. Definitely younger veins of barite which contain almost no ore minerals occur in sediments in the vicinity of the Black Forest. These barites do not show significant deviations in sulfur isotope ratios from those of the older barites. Therefore, these younger barite veins are considered as "secondary hydrothermal deposits" (SchneiderhÖhn). The same seems to hold for galenas and barites from Tertiary faults on the western side of the Black Forest. Only the hydrothermal barites of the Wiesloch area near Heidelberg exhibit significant deviations with sulfur isotope values up to 34 S = +59·0%, values hitherto only known from sedimentary caprock sulfates. Therefore it seems likely that solutions with dissolved caprock sulfate have participated in the formation of these Tertiary deposits.
Gehlen Kurt V.
Nielsen Heimo
Ricke Werner
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