Phase relationships involving sphalerite in the Zn-Fe-S system have been estimated below 300 degrees C by combining new experimental data with microprobe analyses of sphalerites from naturally occurring, low-temperature assemblages. Sphalerite compositions from the various sources are in agreement and the univariant, three-phase boundaries derived from them are compatible with the arrangement of univariant assemblages in the Fe-S system as determined by Kissin and Scott (1972). These results show that sphalerite composition varies in response to a FeS in similar manner to its behavior at higher temperatures producing lower FeS contents in sphalerites in the more sulfur-rich iron sulfide assemblages.

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