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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Sulfur isotopic fractionation among sphalerite, galena and sulfide ions

Yasuhiro Kiyosu
Geochemical Journal, Vol. 7, No. 4, P. 191-199, 1973


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.

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