Mineral chemistry of the silicate mineral phases of Banded Iron- Formation of high-grade region, Karnataka.

Abstract

The silicate minerals present in this BIF are ferrohypersthene, ferro-augite, almandine, lamellar pyroxene, pyroxferroite, grunerite, edenite, ferroan pargasitic hornblende and biotite, all of which crystallized in a metamorphic environment. P-T conditions were estimated at 7-8 kbar and 600-650oC. Chemical variations are attributed to P-T conditions, bulk composition and fO2.-R.E.S