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- W2079137305 abstract "Pyrite from altered basalts from Nàmafjall and Krafla high-temperature fields and deep zones at Reykir, Leira and other low-temperature fields, and aqueous sulfides from Nàmafjall, have δ34S values of 0 to 2.6%. These values are close to those for postglacial basaltic lavas from the Reykjanes Peninsula. The major source of sulfur in these meteoric hydrothermal systems is the upper-mantle or basalt. At the low-temperature fields, however, the δ34S values of sulfide decrease with decreasing depth, suggesting the presence of a light sulfur source in the shallower aquifers. In contrast, in the Reykjanes and Svartsengi geothermal fields, where seawater contributes to the hydrothermal systems, sulfide sulfur is distinctly enriched in 34S at all depths except for one Reykjanes pyrite from 84 m depth. The enrichment is about 8%. at the deepest core (1734 m) of Reykjanes and decreases with decreasing depth. These enrichments are most likely due to seawater sulfate being involved in the hydrothermal systems. However, in the Reykjanes fluid, dissolved heavy sulfates are not in isotopic equilibrium with sulfide. Disequilibrium between sulfate and sulfide is also demonstrated in all other Icelandic geothermal systems studied." @default.
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- W2079137305 date "1980-08-01" @default.
- W2079137305 modified "2023-09-27" @default.
- W2079137305 title "Sulfur isotope systematics in icelandic geothermal systems and influence of seawater circulation at Reykjanes" @default.
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- W2079137305 doi "https://doi.org/10.1016/0016-7037(80)90076-9" @default.
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