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Sulfur isotopic fractionation among sphalerite, galena and sulfide ions

1973; The Geochemical Society of Japan; Volume: 7; Issue: 4 Linguagem: Inglês

10.2343/geochemj.7.191

1880-5973

Yasuhiro Kiyosu,

Calcium Carbonate Crystallization and Inhibition

Sulfur isotope fractionation in ZnS-HS- and PbS-HS- systems has been studied experimentally in the temperature range from 50 to 340°C. Sulfur isotopic exchange between sulfide minerals and HS- ions was found to be unexpectedly fast. In the ZnS-HS- system several ten hours are enough to attain isotopic equilibrium in the temperature range from 50 to 200°C. Temperature dependence of equilibrium fractionation was estimated as follows: In αsphalerite-HS-= 111T-2 + 0.00136 In αgalena-HS-=-782 T-2 + 0.00170 From these equations the temperature dependence of sphalerite-galena fractionation is In αsphalerite-galena=891 T-2-0.00057.