Geochemistry of the Granites from Jharsuguda District, Orissa: Implications for Rare Metal Mineralisation

Jharsuguda Granite is intruded by several pegmatitic bodies, including rare metal bearing ones hosting columbite-tantalite and beryl. Geochemically, it is a silica-rich, metaluminous to peraluminous and potassic granite enriched in trace elements such as Rb, Nb, Zr, Y, Ga and Th, and depleted in Ba, Sr and Ti resulting in high Rb/Sr, Rb/Ba and Ga/Al ratios. The petromineraiogical and geochemical characters indicate Jharsuguda Granite as an A-type, within plate granite (WPG), emplaced around 650°-700°C at an assumed pressure of 5 kb. The granite has characteristics similar to niobium-yttrium-fluorine (NYF) bearing, A-type fertile granites.