Two-pyroxene mafic granulites from Patharkhang, Shillong-Meghalaya Gneissic Complex

Abstract

The two-pyroxene mafic granulite of Patharkhang area belongs to the Shillong-Meghalaya Gneissic Complex and includes orthopyroxene-clinopyroxene-hornblende-plagioclase ± quartz as common mineral assemblages, which are stable at thermal peak of regional metamorphism. In this study electron probe microanalysis data have been used to discuss mineral chemistry and pressure-temperature (P-T) condition of metamorphism of the mafic granulite. The average P-T condition suggests a thermal peak of metamorphism at 1029 ± 62°C/7.6 ± 1.7 kbar.