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

J. S. Rao ¹, G. N. Hegde ¹, B. K. Bhaumik ¹

Affiliations
1 AMD Complex, Khasmahal, Eastern Region, Jamshedpur - 831 002, IN

Abstract

Factor analysis of multi-element data for Dhanjori conglomerates of Singhbhum district, Bihar, in eastern India reveals three factors accounting for about 57% of the total information contained in the data. Factors 1 and 2 are associated with radioactive elements. They also indicate that the provenance is a mixed felsic and mafic terrain, and that the minor and accessory constituents of these rocks are concentrated in the conglomentes. These two factors appear to result from the same sedimentological process. The Factor-3 results from the V-A1 diadochy. Factor-1 which is seen to be associated with both zircon and radioelements does not contain Pb. Pb is relegated to the Factor-2.

Keywords

Factor Analysis, Geochemistry, Uranium, Quartz Pebble Conglomerate, Dhanjori Basin, Bihar, Eastern India.

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A. K. Dwivedi ¹, G. N. Hegde ², K. Umamaheswar ³

Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Jamshedpur- 831 002, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Bangalore - 5 60 072, IN
3 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Shillong - 793 011, IN

Abstract

New occurrences of uranium mineralisation have been discovered in quartzite and siltsone/Shale units of the Gulcheru Quartzite Formation in the area to the north of E-W trending Idupulapaya fault around Idupulapaya, Malayalamma Bhavi, Tipparajupalle and Cheruvula Bodu. Mineralisation occurs in the form of lensoid bodies of 5 m x 0.5 m to 50 m x 1.5 m and is traced intermittently over an extent of 2000 m. Physical assay result of rock samples (n=66) has indicated values from 0.011% to 1.769% eU₃O₈, 0.017% to 1.848% U₃O₈ and <0.01% ThO₂. Samples (n=21) also analysed higher concentration of Cu (<25 ppm to 3202 ppm), Mo (<25 ppm to 472 ppm), Pb (<25 ppm to 2015 ppm), V (<25 ppm to 1010 ppm), Ag (<0.25 ppm to 3.92 ppm) and Au (<0.25 ppm to 1.40 ppm). Uranium minerals identified are uranophane, autunite, uranitite, pitchblende and U-Ti complex in association with pyrite, chalcopyrite, specular haematite and limonite. The above findings have opened up new potential target areas to look for uranium in the southwestern margin of Cuddapah basin.

Keywords

Uranium, Gulcheru Quartzite, Cuddapa Basin, Andhra Pradesh.

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