Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

S. Viswanathan ¹, P. Jagadeesan , K. S. Mishra , P. V. Ramesh Babu

Affiliations
1 Hyderabad - 500 016, IN

Abstract

No Abstract.

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S. Viswanathan ¹, P. Jagadeesan ², K. S. Misra ², P. V. Ramesh Babu ³

Affiliations
1 Flat B-203, Block-B, United Avenue Apartments, South End, 7- 1-29, Ameerpet, Hyderabad- 500 016, IN
2 Atomic Minerals Directorate for Exploration and Research, Civil Lines, Nagpur -440 001, IN
3 Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad - 500 016, IN

Abstract

No Abstract.

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P. Jagadeesan ¹, K. S. Mishra ¹, P. V. Ramesh Babu ²

Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Civil Lines, Nagpur - 440 001, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 01 6, IN

Abstract

Manganocolumbite in the pegmatites of Bhurpidungri(Lat: 21°51'30": Long: 84°15'52", T.S.No.73C/5) in the Jharsuguda district of Orissa is reported for the first time from the pegmatites of India. It contains upto 18.46% MnO, with an average (n=8) of 14.52% MnO, 7.26% FeO^(T), 60.18% Nb₂O₅ and 14.33% Ta₂O₅. A swarm of pegmatites is exposed, intruding at the contact of granite gneiss and amphibolite/Charnockite near the Bhurpidungri village. These pegmatites are well-Zoned with prominent quartz core, intermediate zone and wall zone. About 4 tonnes of manganocolumbite has been estimated in the gravels of these pegmatites for exploitation. Apart from this, beryl is also found in sufficient quantity.

Keywords

Manganocolumbite, Pegmatites, Jharsuguda District, Orissa.

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K. S. Mishra ¹, P. Jagadeesan ¹, K. K. Pandey ¹, V. P. Saxena ², R. M. Sinha ²

Affiliations
1 AMD, CR, Nagpur - 440 001, IN
2 AMD, Hyderabad-500 016, IN

Abstract

Rare earth element (REE) geochemistry of uranium bearing columbite-tantalite and multiple Nb-Ta oxide phases from the Pandikimal-Jangapara pegmatites, Jharsuguda district, Orissa have been studied and evaluated columbite-tantalite from these areas contain low ∑REE (100-1000 ppm) with LREE/HREE_CN<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 (19-28 %) with HREE>LREE. Plot of ∑REE vs. Chondrite-Normalised LREE/HREE shows positive correlation in 'U' rich 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.

Keywords

Rare Earth Element (REE), Columbite-Tantalite, U-Bearmg Multiple Oxide Phases, Pandikimal, Orissa.

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