Pyroxene-Quartz-Magnetite Rocks from Satnur-Halaguru Area, Mysore State

The pyroxene-quartz-magnetite rocks occurring in association with the charnockites and other rocks of the Satnur-Halaguru area, which were regarded by many of the early officers of the Mysore Geological Department as members belonging to charnockite series have been reinvestigated. The investigation has brought to light the occurrence in these rocks, of iron-rich minerals like, ferrohypersthene, eulite, hedenbergite, ferroactinolite, iron-rich garnet and the unusual occurrence of pyroxmangite and orthoclase, It is suggested from a detailed study of the field relation, petrology, mineralogy and petrochemistry that the pyroxene-quartz- magnetite rocks form a separate entity, representing metamorphosed iron-rich sediments, which except for their formation under similar metamorphic conditions namely, pyroxene granulite facies, have no relation whatsoever with the intimately associated charnockites of the area.