F. A. Campbell, V. G. Ethier, and H. R. Krouse
The massive sulfide zone; Sullivan orebody
Economic Geology and the Bulletin of the Society of Economic Geologists (October 1980), 75(6):916-926

Abstract:
Previous results of sulfur isotope analyses of sulfides from the Sullivan deposit have indicated a relative enrichment in ³⁴ S in the western section of the orebody. This study provides further detail from intensive sampling of 15 drill cores that transect the massive pyrrhotite zone. The pyrrhotite fabric shows a foliation that may be bedding, kink bands, and twin orientations which are consistent with horizontal maximum compression. Sulfur isotope data from 146 pyrrhotite separates give values that range from --5.0 to +4.0 per mil (mean 0.0 per mil). A volume 200 by 400 m and 20 m thick is delineated in which pyrrhotite is enriched in ³⁴ S. This anomaly is attributed to the high temperatures associated with the site of upwelling metal-bearing solutions.Samples were analyzed by X-ray diffraction for copper, zinc, lead, and tin. No statistically significant correlation was found between any of these metals and the pattern of delta ³⁴ S variation.