Abstract
DURING the past few years considerable attention has been focused on the potential of pyrrhotite as a geothermometer. In 1962 Arnold1 determined experimentally the solvus relationship between hexagonal pyrrhotite and pyrite, thereby demonstrating that the percentage of iron in pyrrhotite along this solvus was temperature dependent, but insensitive to pressure. The potential of this method was then tested on samples from the Highland-Surprise Mine2 and the temperatures obtained from the pyrrhotite geothermometer were found to agree well with those obtained from associated sphalerite using the sphalerite geothermometer3. More recently, Buseck4 and Kullerud et al.5 have attempted to apply the method to monoclinic pyrrhotite–pyrite assemblages by inverting the monoclinic pyrrhotite to hexagonal symmetry by heating.
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