Significant Values of Rare Earth Element, Uranium and Thorium in Felsic Tuff from the Koira Group of Western Iron Ore Group, Singhbhum Craton, Eastern India

The aim of the present study to shows the occurrences of two bands of felsic tuff having dacitic to rhyodacitic in composition which is hosted the rare earth element, uranium, and thorium mineralization belonging to the Western Iron Ore Group, Singhbhum Craton, Eastern India. The petrographic study suggests that it is predominantly comprised of quartz, plagioclase, microcline, muscovite, biotite, chlorite, epidote, zircon, monazite, allanite, apatite, pyrite, and opaques which are mainly embedded in the devitrified groundmass. Petrochemically, it is characterised by high SiO2, Al2O3, and low Na2O, K2O, and TiO2 contents. The analysed samples show higher values of La and Ce which vary from 30 ppm to 319.79 ppm (average of 186.65 ppm) and 68.04 ppm to 428.87 ppm (average of 295.07 ppm) respectively. These average values are approximately five times higher than the crustal abundance of La and Ce. Pr is ranging from 8.74 ppm to 44.97 ppm and Nd values vary from 44.05 ppm to 167.87 ppm which is higher than the crustal abundance. Values of Sm (5.83 - 28.52 ppm), Gd (5.32 - 31.11 ppm), Dy (4.25 - 28.53 ppm), and Yb (1.63 - 15.97 ppm) are also noteworthy. The ?REE varies from 174.03 ppm to 1056.99 ppm (average of 681.3 ppm) which is approximately five times higher than the crustal abundance. Besides, uranium (U) values vary from 5 ppm to 35 ppm with an average of 16.08 ppm which is approximately nine times more than the crustal abundance values of U (1.8 ppm). The value of thorium (Th) is varying from 7 ppm to 69 ppm (average of 38.58) which is more or less five times higher than the crustal abundance of Th (7.2 ppm).