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Nagendra Babu, G.
- Discovery of Uranium Mineralisation in Sheared Quartzite and Associated Crystallines in the Environs of Pranhita-Godavari Basin, Mysemgutta, Kaddam Area, Adilabad District, Andhra Pradesh
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad - 500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 3 (2008), Pagination: 331-336Abstract
Reconnaissance radiometric surveys in the northwestern parts of the western Pakhal belt in the Pranhita-Godavari Basin (PG basm), have led to the location of uranium anomalies for the first time in the environs of P-G Basin exclusively in the "older sheared fuchsite bearing quartzite'' overlain by the Neo-Proterozoic Penganga sediments in the proxmity of their unconformity contact at Mysemgutta, Kaddam, district Adilabad, A. P. Surface mineralisation is manifested in the form of secondary uranium minerals associated mainly along the fractures in the fault zones. The quartzite assayed up to 0.23% U3O8 with negligible thorium (2). Follow up petrological and XRD studies of the rocks revealed the presence of primary uranium mineral uraninite (UO2) in addition to secondary U-Minerats in the form of lanthinite [U6O7(OH)2O], metatorbernite [Cu(UO2)2(P04)2 8H2O] and phosphuranylite [Ca(UO2)4(PO4)2(OH)4 7H2O], besides U+Ti phases/brannerite [U,Ca,Ce)(Ti,Fe)206 Other ore minerals associated are chromite, pynte, pyrrhotite and rutile. The discovery has opened up new vistas for seeking Proterozoic unconformity related uranium mineralisation at the base of Neo-Proterozoic Penganga sediments in the PG Basin, Andhra Pradesh.Keywords
PG Basin, Penganga, Fuchsite Quartzite, Unconformity, Kaddam, Mysemgutta, Andhra Pradesh.
- Hydrouranium Anomalies as an Effective Tool in Exploration of Concealed Unconformity Related U-Deposit in Srisailam Subbasin, Andhra Pradesh - Case Study from Chitrial Area
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Bangalore-560 072, IN
2 Atomic Minerals Directorate for Exploration and Research, Hyderabad -500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, Bangalore-560 072, IN
2 Atomic Minerals Directorate for Exploration and Research, Hyderabad -500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 5 (2011), Pagination: 468-476Abstract
Relationship of hydro-uranium anomalies (2-649 ppb) vis-a-vis underlying uranium ore body has been attempted based on seventy nine water samples collected from the exploratory boreholes on the northern periphery of Srisailam sub basin, Nalgonda district, A.P. Water table is hosted in the granitoid aquifer which underlies the cover rocks of Srisailam Formation. TDS (total dissolved salt) range from 123 to 1088 ppm (x- = 329 ppm) and analyzed >500 ppm in eight samples. Water samples show a strong positive correlation of TDS with Cl- (r=0.90), Na+ (r=0.82), Mg (r=0.80) and a moderate positive correlation with Sr (r=0.48) and Ca (r=0.70). Low value (<0.4) of Normalised Magnesium (NMg) indicates that host rock aquifer has not undergone chloritisation. Accumulate contour plan of uranium ore body shows NW-SE trend and coincides with the hydro-uranium contour. Correlation sections of ore body display true as well as false hydro-uranium anomalies in N-S and E-W profiles. Hydro-uranium anomalies owe their origin to uranium cations, dissolved from the mineralized horizon in to groundwater. Hydro-geochemical orientation survey carried out at Chitrial plateau may be applied regionally in the Srisailam sub basin as an effective tool to explore the concealed unconformity type uranium mineralization below Srisailam Formation.Keywords
Hydrouranium Contours, Chitrial Plateau, Srisailam Formation, Accumulate Contour Map, Andhra Pradesh.References
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