Abstract
Several radioactive quartz-pebble conglomerate (QPC) occurrences at the western margin of Archaean Bonai granite and overlying Iron Ore Group (IOG) rocks have recently been located over a total strike length of 8–10 km intermittently in a NE-SW to E-W trend with steep dips due north-west to north in parts of Sundargarh district of Orissa. The QPC samples have analysed up to 0.039% U3O8 and 0.035% ThO2 with high concentration of Y (74 to 518 ppm), La(<100 to 880 ppm), Cr ( 126 to 633 ppm), Zr (137 to 1250 ppm) and Pb (31 to 581 ppm). Cellulose Nitrate (CN) film studies of few QPC samples indicated adsorbed uranium over goethite and infiltrated ferruginous material (limonite), secondary uranium as encrustation and fracture filling and discrete sub-rounded grains of monazite, zircon, allanite and rare xenotime in the matrix of QPC as radioactive phases. Higher content of Th over U, elevated concentration of Y and La in QPC eliminates the possibility of its low temperature product by epigenetic processes. Poor correlation of U with elements like Pb, Y, Zr, La and Cr can be explained due to surficial leaching of uranium from QPC after its deposition as reflected by adsorbed U over iron-oxides and low U/Th ratio in QPC in the area.
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References
Aurora, S.N. (1985) Paragenesis of uraninite and associated ore minerals in the Precambrian oligomictic conglomerates from Walkunji, South Kanara district, Karnataka, India. Jour. Geol. Soc. India, v.26, pp.177–181.
Das, A.K., Awati, A.B. and Sahoo, P. (1988) Quartz-pebble conglomerate of the Singhbhum craton, Bihar and Orissa. Mem. Geol. Soc. India, no.9, pp.83–87.
Kumar, Ajay and Birua, S.N.S. (2005) Annual Report for the Field Season 2004–05, QPC Investigations, Unpublished Report, AMD, Hyderabad.
Kumar, Ajay and Pande, Dheeraj (2006) Annual Report for the Field Season 2005–06, QPC Investigations, Unpublished Report, AMD, Hyderabad.
Mahalik, N.K. (1987) Geology of rocks lying between Gangpur Group and Iron Ore Group of The Horse Shoe Syncline in North orissa. Ind ian Jour. Earth. Sci., v.14, no.1, pp.73–83.
Mishra, K.S., Durairaju, S., Rajshekharan, P. and Das, A.K. (1997) Occurrence of U-Au-REE bearing quartz-pebble conglomerate at Sayamba-Taldih, Sundargarh district, Orissa. Jour. Geol. Soc. India, v.50, pp.93–94.
Naik, Ashutosh (2001) A revision of the stratigraphy of Chandiposh area in eastern part of Sundargarh district, Orissa. Indian Jour. Geol., v.73, no.2, pp.119–137.
Pandit, S.A. (2002) Uranium occurrences in the quartz-pebble conglomerate in Karnataka. EARFAM, AMD, Hyderabad, v.14, pp.131–146
Rama Rao, B.V. (1974) Discovery of uraniferous Precambrian conglomerates at Chikmagalur, Karnataka state. Curr. Sci., v.44, pp.174–175.
Robertson, D.S. (1962) Thorium and uranium in Blind River ores. Econ. Geol., v.57, pp.1175–1184.
Robinson, Andrew and Spooner, Edward, T.C. (1982) Source of the detrital components of uraniferous conglomerates, Quirke ore zone, Elliot Lake, Ontario, Canada. Nature, v.299, pp.622–624.
Saxena, S.K., Mishra, K.S. and Raju, S.D. (1994) Annual Report for the Field Season 1993–94. Unpublished Report, AMD, Hyderabad.
Sengupta, S., Paul, D.K., De Laeter, J.R., Mcnaughton, N.J., Bandopadhyay, P.K. and De Smeth, J.B. (1991) Mid Archaean evolution of the Eastern Indian craton: Geochemical and isotopic evidence from Bonai Pluton. Precambrian Res., v.49, pp.23–37.
Smith, Norman, D. and Minter, W.E.L. (1980) Sedimentological controls of gold and uranium in two Witwatersrand palaeoplacers. Econ. Geol., v.75, No.1, pp.1–14.
Schidlowski, Manfred (1975) Uraniferous constituents of the Witwatersrand conglomerates: Ore microscopic observations and implications for the witwatersrand metallogeny. In genesis of uranium and gold bearing Precambrian quartz-pebble conglomerates, USGS Prof. Paper, 1161-A-BB, N1–N24.
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Kumar, A., Birua, S.N.S., Pande, D. et al. Radioactive quartz-pebble conglomerates from western margin of Bonai granite pluton, Sundargarh district, Orissa — A new find. J Geol Soc India 73, 537–542 (2009). https://doi.org/10.1007/s12594-009-0037-5
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DOI: https://doi.org/10.1007/s12594-009-0037-5