Abstract
Two textural relationships between pyrrhotite and ferromagnesian silicates were found to occur in a metamorphosed sandy pelite at the staurolite grade of metamorphism. (1) Increased grain size of silicates at the pyrrhotite-silicate boundary; (2) Oriented intergrowths of pyrrhotite in large grains of chlorite and biotite. Both textures were interpreted as resulting from sulfide-silicate reactions. Ferromagnesian silicates in these sulfidic rocks show higher Mg/Fe ratios than those in non-sulfidic rocks in the same area.
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