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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
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Sulfur isotopic fractionation among sphalerite, galena and sulfide ions

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

ABSTRACT

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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