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Sharma, U. P.
- Uranium Occurrence in Proterozoic Chilpi Group, near Kanhari, Kawardha District, Chhattisgarh
Abstract Views :242 |
PDF Views:81
Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, AMD Complex, Civil Lines, Nagpur 440 013, IN
2 Atomic Minerals Directorate for Exploration and Research, AMD Complex, Begumpet, Hyderabad 500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, AMD Complex, Civil Lines, Nagpur 440 013, IN
2 Atomic Minerals Directorate for Exploration and Research, AMD Complex, Begumpet, Hyderabad 500 016, IN
Source
Current Science, Vol 107, No 3 (2014), Pagination: 364-367Abstract
No Abstract.Full Text
- Uranium and Associated Polymetallic Mineralization in Palaeoproterozoic Khetabari Formation of Bomdila Group, Laggi Gamlin Area, West Siang District, Arunachal Pradesh, India
Abstract Views :235 |
PDF Views:78
Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Shillong 793 019, IN
2 Atomic Minerals Directorate for Exploration and Research, Hyderabad 500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, Shillong 793 019, IN
2 Atomic Minerals Directorate for Exploration and Research, Hyderabad 500 016, IN
Source
Current Science, Vol 119, No 4 (2020), Pagination: 603-606Abstract
No Abstract.Full Text
- Disequilibrium of uranium mineralization – a case study of Devri area, Surajpur district, Chhattisgarh, India
Abstract Views :181 |
PDF Views:87
Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Central Region, Civil Lines, Nagpur 440 001, IN
2 Atomic Minerals Directorate for Exploration and Research, North Eastern Region, Nongmynsong, Shillong 793 00, IN
3 Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad 500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, Central Region, Civil Lines, Nagpur 440 001, IN
2 Atomic Minerals Directorate for Exploration and Research, North Eastern Region, Nongmynsong, Shillong 793 00, IN
3 Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad 500 016, IN
Source
Current Science, Vol 120, No 11 (2021), Pagination: 1753-1757Abstract
Disequilibrium in the uranium series is a vital parameter to ascertain the state of equilibrium between uranium group (parent uranium) and its daughters, i.e. radium group of elements. The 238U isotope of uranium is the parent of 14 daughter isotopes forming the uranium series. The first five isotopes of 238U series, i.e. 238U, 234Th, 234Pa, 234U and 230Th form uranium group and the sixth to last isotopes of 238U series, i.e. 226Ra, 222Rn, 218Po, 214Pb, 214Bi, 214Po, 210Pb, 210Bi, 210Po and 206Pb form radium group. Isotopes in the uranium and radium group usually remain in equilibrium within the group, but disequilibrium commonly exists between the two groups. In an open system, the mobility of radium is significant due to radon gas produced as a daughter element in the radium series. Anomalies with excess radium are commonly found around springs and seepages, whereas uranium anomalies are usually found under reducing environments. A study was carried out in Devri area, Surajpur district, Chhattisgarh, India, to decipher the state of disequilibrium in the area by analysing the drill core samples (n = 4470) from 43 boreholes. This study has revealed a strong disequilibrium (65%) in favour of the parent uranium. This disequilibrium is due to cycles of dissolution and deposition of parent uranium; aided by the movement of groundwater and diverse geochemical behaviour of different radionuclides. In addition, loss of radon from the system might have also contributed to the disequilibrium in favour of the parent uranium. Linear regression coefficient between U3O8 (parent uranium) and RaEq.(U3O8) was calculated to be 0.82. Strong disequilibrium in favour of the parent uranium will enhance the uranium ore reserve in Devri area.Keywords
Beta-Gamma Method, Disequilibrium Factor, Linear Regression Coefficient, Radium Group, Uranium Mineralization.Full Text
References
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- Rajeev, B., Sharma, U. P., Sinha, P. K., Majumdar, A. and Roy, M. K., A new sub-surface find of uranium mineralization in Devriarea, Proterozoic Surguja Crystalline Belt, Surguja district, Chhattisgarh. India. Curr. Sci., 2013, 104(2), 234–238.
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- Grasty, R. L., Gamma ray spectrometric methods in uranium exploration – theory and operational procedures. In Geophysics and Geochemistry in the Search for Metallic Ores, Geological Survey of Canada, Economic Geology Report No. 31, 1979, pp. 147–161.
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- Anomalous uranium concentration in tourmaline-bearing leucogranite of Higher Himalaya, Nuranang, Tawang district, Arunachal Pradesh, North East India
Abstract Views :87 |
PDF Views:61
Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Hyderabad 500 016, India, IN
2 Atomic Minerals Directorate for Exploration and Research, Nagpur 400 001, India, IN
3 House No. 171, Swami Colony, Phase 1, Akar Nagar, Katol Road, Nagpur 440 013, India, IN
4 Flat 511, Block Garnet (E), Rainbow Vista@Rock Garden, Moosapet, Hyderabad 500 018, India, IN
1 Atomic Minerals Directorate for Exploration and Research, Hyderabad 500 016, India, IN
2 Atomic Minerals Directorate for Exploration and Research, Nagpur 400 001, India, IN
3 House No. 171, Swami Colony, Phase 1, Akar Nagar, Katol Road, Nagpur 440 013, India, IN
4 Flat 511, Block Garnet (E), Rainbow Vista@Rock Garden, Moosapet, Hyderabad 500 018, India, IN
Source
Current Science, Vol 124, No 2 (2023), Pagination: 253-257Abstract
Here we report anomalous uranium concentration in tourmaline-bearing leucogranite occurring at Nuranang, Tawang district, Arunachal Pradesh, North East India. The leucogranite occurs as concordant layers parallel to gneissic foliation, similar to the gneisses of the Palaeoproterozoic Se La Group. It is medium to coarse-grained, and is composed of quartz, potash feldspar and plagioclase as dominant minerals with variable proportions of muscovite, biotite, tourmaline and garnet. Apatite, zircon and pyrite are accessory minerals. Geochemically, the leucogranite is alkali-rich, peraluminous and highly differentiated. It is emplaced in a syn to late orogenic collision tectonic setting. Analyses of 10 granite samples collected at 500 m intervals show relatively high radioelemental concentration (U: 5–96 ppm, Th: 5–23 ppm, K: 2.23–7.72% and Th/U; 0.07–1.00, n = 10) compared to normal granite. Anomalous uranium concentration in the leucogranite is observed in a 200 m ´ 50 m area at Nuranang. Samples from this area have assayed 0.016–0.029% U3O8 and <0.005% ThO2. Leachable U3O8 content determined in five samples varies from 81.25% to 87.50%. Preliminary studies indicate that uranium is in the adsorbed state associated with iron oxide and altered feldspar/clay. The findings of anomalous uranium concentration in tourmaline-bearing leucogranite likely open up a new target area for uranium search in the Higher Himalaya of Arunachal PradeshFull Text