Abstract

Isotopic fractionations between given sulfide minerals are relatively constant throughout the B-1 orebody and between all six deposits [studied]. The mean pyrite-sphalerite, sphalerite-galena, and pyrite-galena fractionations [differences] are approximately 1, 2, and 3 permil, respectively. These consistencies together with the similarity of the silicate mineralogies in the sulfide deposits, their wall rocks, and the country rocks indicate that sulfur isotopic equilibrium was closely approached at a fairly uniform temperature. It is suggested that low-rank regional metamorphism has generated the observed fractionations and caused local isotopic homogenization with respect to given minerals.

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