2008•Journal of the Geological Society of IndiaRequires access

REE Geochemistry of Uranium-Bearing Columbite-Tantalites and Multiple Oxide Phases from Proterozoic Rare Metal Pegmatites of Pandikimal and Adjoining Areas, Jharsuguda District, Orissa

Kanika Mishra, P. Jagadeesan, Kapil Kumar Pandey, Vimal Saxena, Rajarishi Sinha

Abstract

Abstract: Rare earth element (REE) geochemistry of uranium bearing columbite-tantalite and multiple Nb-Ta oxide phases from the Pandikimal-Jangapara pegmatites, Jharsuguda district, Onssa have been studied and evaluated Columbite-tantalite from these areas contain low ΣREE (100-1000 ppm) with LREE/HREECN <0 5 and minor amounts of uranium (0 3-0 6%U3O8) Multiple oxide phases (yttrotantalite, samarskite, microlite and fergusonite) contain elevated amounts of U (10-11% U3O8) and REE (1 9-2 8%) with HREE>LREE Plot of ΣREE vs chondrite-normalised LREE/HREE shows positive correlation in ‘U’nch multiple oxides compared to those from columbite tantalites which tend to show a negative correlation The LREE/HREE ratio is 0 24 with negative Eu anomaly (Eu/Eu* = 0 1) indicating evolved nature of these pegmatites

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Key concepts: Columbite, Pegmatite, Geology, Geochemistry, Proterozoic, Uranium, Chemistry, Metallurgy