naa a22 4500 510755992 CHVBK 20180411083122.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s12594-013-0120-9 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0120-9 Signature of potassium enrichment in granite of the Chitrial area, Nalgonda district, Andhra Pradesh: Inferences using its U, Th, K2O, Na2O, Rb, Ba and Sr contents [Elektronische Daten] [H. Rajaraman, G. Nagendra Babu, S. Chavan, K. Achar, P. Ramesh Babu] A medium tonnage unconformity proximal uranium deposit has been established at Chitrial by the Atomic Minerals Directorate in the Srisailam sub-basin. In this type of deposits, the association of uranium with potassic alteration (illitization) is well-documented. The present study is directed towards understanding such an association in the Chitrial area for which the uranium mineralized borehole core samples were collected and analyzed. It is observed that the average concentrations of K2O, Na2O, Rb, Ba and Sr in the granite of the Chitrial area are 5.35%, 1.78%, 252 ppm, 564 ppm and 52 ppm, respectively, and they show average critical elemental ratios of K/Rb, Ba/Rb and Rb/Sr as 191, 2.37 and 7.13, respectively. The granites show low K/Rb, low Rb/Ba and high Rb/Sr ratios compared to that of the average crust indicating its derivation from crustal source. The samples have higher values of uranium (av. 53 ppm), thorium (av. 66 ppm) and lead (av. 41 ppm). The U/Th ratio in the granite varies from 0.07 to 20.86 with an average of 1.68. They also exhibit high K2O/Na2O ratio typical of post-Archaean granite and very high values suggest the possibility of later potassium enrichment. Geological Society of India, 2013 K/Rb nationallicence Ba/Rb nationallicence Rb/Sr ratios nationallicence Potassium enrichment nationallicence Chitrial granite nationallicence Andhra Pradesh nationallicence Rajaraman H. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 500 016, Hyderabad, India aut Nagendra Babu G. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 500 016, Hyderabad, India aut Chavan S. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 500 016, Hyderabad, India aut Achar K. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 500 016, Hyderabad, India aut Ramesh Babu P. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 500 016, Hyderabad, India aut Journal of the Geological Society of India Springer India 82/1(2013-07-01), 53-58 0016-7622 82:1<53 2013 82 12594 https://doi.org/10.1007/s12594-013-0120-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0120-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rajaraman H. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 500 016, Hyderabad, India aut NATIONALLICENCE 700 1- Nagendra Babu G. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 500 016, Hyderabad, India aut NATIONALLICENCE 700 1- Chavan S. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 500 016, Hyderabad, India aut NATIONALLICENCE 700 1- Achar K. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 500 016, Hyderabad, India aut NATIONALLICENCE 700 1- Ramesh Babu P. Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 500 016, Hyderabad, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer India 82/1(2013-07-01), 53-58 0016-7622 82:1<53 2013 82 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer