Geochemistry and petrogenesis of pyrophyllite deposit of Madrangjodi,Keonjhar district,Orissa

Pyrophyllite deposit at Madrangjodi is a large lensoidal massif overlain unconformably by Dhanjori quartzite and underlain by the parent Singhbhum granite (Phase — II). Pyrophyllite and quartz are the major minerals with minor to trace amounts of muscovite, chloritoid opaques and tourmaline. It is broadly divisible into lamellar, granular and schistose varieties. SiO₂ (66.90–74.36%) and Al₂O₃ (20.80–27.54%) are the major oxides. The major elements data indicate its derivation from Singhbhum granite with depletion of SiO₂ and increment of Al₂O₃. Trace and REE data are discussed to corroborate its genesis.