- D. C. Banerjee
- N. Ranganath
- K. M. V. Jayaram
- M. K. Khandelwal
- P. C. Pant
- P. K. Hansda
- S. Ramachandran
- Y. V. Rathaiah
- Siby K. Varughese
- Rajendra Singh
- N. Murali Krishna
- G. V. G. K. Murthy
- A. K. Paul
- P. Nageswara Rao
- Anjan Som
- T. Perumal
- V. P. Saxena
- R. M. Sinha
- S. Niranjan Kumar
- G. Nagendra Babu
- A. V. Jeyagopal
- R. Dhana Raju
- Anjan Chaki
- Shekhar Gupta
- P. S. Dandele
- M. B. Verma
- M. Sai Baba
- K. Shobhita
- R. Mohanty
- Yamuna Singh
- K. Umamaheswar
- R. Viswanathan
- P. S. Parihar
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Maithani, P. B.
- Rare Metal-Bearing Pegmatites in Parts of Southern Karnataka, India
Authors
1 Atomic Minerals Division, Begumpet, Hyderabad 500016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 30, No 6 (1987), Pagination: 507-513Abstract
Several pegmatites containing commercially viable sources of columbite-tantalite have been located in the Holenarsipur, Kdshnarajapet and Nagamangala schist belts. The pegmatites in Holenarsipur schist belt near Hassan, contain columbite-tantalite, rich in both niobium and tantalum and carry appreciable amounts of beryl. The Nagamangala schist belt is particularly rich in tantalite-bearing (Ta2O5 50-70%) pegmatites.
Analysis of feldspars from the three different belts indicates that they are potassic in the Nagamangala belt while they are sodic in the case of two other belts. Trace element analysis of muscovite indicates an average of 42, 242, 107, 325 ppm of Be, Nb, Sn and Li in Nagamangala belt as against 55, 114, 127 and 329 ppm respectively in Holenarsipur belt. Presence of considerable amount of bismutite in Mundur pegmatite and traces of spodumene and pollucite in Nagamangala belt have been confirmed.
- Geological and Geochemical Studies on Carbonatites and Rocks of Carbonatitic (?) Affinity from Areas North of the Narmada Lineament in Madhya Pradesh and Gujarat
Authors
1 Atomic Minerals Division, Department of Atomic Energy Jaipur - 302 004, IN
2 Atomic Minerals Division, Department of Atomic Energy Vadodara - 390 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 3 (1997), Pagination: 307-313Abstract
In the region covering some 400 km2 immediately to the north of Narmada lineament between Dharmrai, Dhar district, Madhya Pradesh, in the east and Nakhal and Panwad, Vadodara district, Gujarat, in the west, numerous E-W to ENE-WSW trending linear fault zones (c.l km to 5 km long X 20 m to over 100 m wide) occur within the Deccan basalts and infratrappean rocks. Brownish, brecciated, calcareous rocks, often with pockets and veins of calcite (carbonatites ?) are found within such fracture zones, and many of them show intrusive-like features. These faults apparently have developed sympathetic to the major Narmada rift to the south which provided structural avenues for the emplacement of carbonatites and associated basic alkaline rocks as found at Ambadongar. Panwad, Kawant and Saidiwasan, as part of the Deccan volcanic episode. Comparison of major and selected trace element data on these carbonatitic (?) rocks with Woolley and Kempe's average trace elements in carbonatite indicates that they are significantly impoverised in Zr, Nb, Y, La and U compared to the carbonatites and phonolites and phonolitic nephelinites of Panwad, Saidiwasan and Nakhal which are enriched in these elements. Carbonate-rich rocks of Bakhatgarh and Katarkheda in the east are rich in CaO and P2O3 compared to those of Panwad and Kawant. Based on available data it is suggested that the carbonatitic (?) types found in the east may represent an early phase of carbonatite (?) impoverished in Zr, Nb, Y, La, U and Th compared to the late residual (?) phase found in the Panwad-Saidiwasan-Nakal area which records significant radioactivity (upto 0.04% eUPR) and higher abundances of Zr (0.06%) and Nb (upto 0.1 %).Keywords
Petrology, Geochemistry, Carbonatite, Lower Narmada Valley, Madhya Pradesh, Gujarat.- Granites of Zoz Area, Baroda District, Gujarat and its Economic Significance
Authors
1 Atomic Minerals Division, Department of Atomic Energy, Baroda-390 001, IN
2 Hyderabad-500016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 2 (1998), Pagination: 201-206Abstract
The granites around Zoz represent a differentiated, calc-alkaline, subaluminous, A-type granite with higher uranium content. The A-type affinity points to the possibility of encountering Sn, Mo, Bi, Nb, Ta and F mineralisation in the area. The low Th/U ratio also favours vein type U-deposits within granites or in adjacent metasediments.Keywords
Geochemistry, Godhra Granite, Zoz, Champaner, Gujarat.- Thorium-Rich Zircon From the Idar Pegmatite, Sabarkantha District, Gujarat
Authors
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 1 (2007), Pagination: 171-176Abstract
Cyrtolite variety of zircon rich in thorium occurs as pockets of radiating, multiple intergrowth crystals in a pegmatite emplaced in the Idar granite, Sabarkantha district, Gujarat. It has a lower specific gravity (3.86-4.4) and micro-Hardness (676-835), compared to crystalline zircon (4.71 and 841-1468) respectively. The mineral analysed lower contents of SiO2 (23.89%) and ZrO2 + HfO2 (43.36%), compared to normal zircon, and high contents of ThO2 (5.06%), UO2 (0.74%), Rare Earth Oxides (REO) (7.88%), FeO (4.44%), CaO (1.98%), MnO (1.26%), H2O (7.95%). Accumulated damage to the crystal structure caused by the presence of appreciable amount of radioelements (5.06% ThO2 and 0.74% UO2) and also REO (7.88%) in the phase, aided in its metamictisation, hydration and alteration resulting in cyrtolite formation. On heating at 900±C the re-Crystallised material yielded zircon x-Ray pattern. The "d" spacings, intensities of the reflections obtained and increase in the size of unit cell determined for the specimen, compared to that of standard zircon, matches well with the observations made for similar metamict cyrtolites studied by others.Keywords
Th-Rich Zircon Pegmatite, Idar Granite, Gujarat.- Proterozoic Unconformity-Related Uranium Occurrence around Rallavagu Tanda, Palnadu Sub-Basin, Andhra Pradesh
Authors
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 1 (2005), Pagination: 11-14Abstract
Recent investigations have brought out significant uranium occurrences (up to 0 65% U308)spread over as discontinuous zones (up to 300 m × 280 m × 1-3 m) over an area of about 7 km × 2 km along the northern part of Palnadu Sub-Basin. The radioactive zones are exposed along the Upper Proterozoic unconformity contact between the basement granite and the Banganapalle quartzite near Lavur Tanda, Jaitram Tanda, Boligutta Tanda, Rallavagu Tanda and Gandhi Nagar villages in Nalgonda district, Andhra Pradesh. These findings are reported in this note along with some features of mineralisation.Keywords
Uranium Occurrence, Proterozoic, Palnadu Sub-Basin, Andhra Pradesh.- Discovery of Uranium Mineralisation in Sheared Quartzite and Associated Crystallines in the Environs of Pranhita-Godavari Basin, Mysemgutta, Kaddam Area, Adilabad District, Andhra Pradesh
Authors
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.- Cyclic Sedimentation and Classification of the Papaghni Group of Sediments, Cuddapah Basin, Andhra Pradesh
Authors
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 016, IN
2 Atomic Minerals Directorate for Exploration and Research, 6-3-124, Hastinapuri, Secundarabad - 500 094, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 3 (2008), Pagination: 363-370Abstract
The Mesoproterozoic Papaghni Group in the Cuddapah basin of southern Andhra Pradesh comprises mainly arenaceous, argillaceous and calcareous sediments. These sediments occur in sequences that are mappable on large scale (15000) and the sequences are idenified by unconfornities which are recognised by conglomerate/breccia beds in Vempalle Formation (Papaghni Group). Each sequence starts with near shore arenaceous and argillaceous sediments and ends up with relatively deeper marine chemical precipitate, viz dolomitic sediment, with these three constituting one cycle of sediments. The thickness of each cycle ranges from about twenty meters to hundreds of meters and three such cycles of sedimentation are identified. On the basis of the identification of cyclic sedimentation and bounding unconfornuties it is proposed that the Vempalle Formation of Papaghni Group may be classified into Lower, Middle and Upper members, which denote recurrence of similar depositional settings during the Vempalle sedimentation.Keywords
Cyclic Sedimentation, Papaghni Group, Cuddapah Basin, Andhra Pradesh.- Geochemical Assessment of Groundwater Around Macherla- Karempudi Area, Guntur District, Andhra Pradesh
Authors
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 2 (2009), Pagination: 202-212Abstract
Groundwater in Palnad sub-basin is alkaline in nature and Na+-Cl--HCO-3 type around Macherla–Karempudi area in Guntur district, Andhra Pradesh. Total dissolved solids (TDS) show strong positive correlation with Cl-, Na+, Ca2+ and Mg2+, and positive correlation with SO2-4, K+ and HCO-3. Calcareous Narji Formation is the dominant aquifer lithology, and water-rock interaction controls the groundwater chemistry of the area. Chloro-alkaline indices (CAI) are positive at Miriyala, Adigopula, Mutukuru, Macherla and Durgi suggesting replacement of Na+ and K+ ions from water by Mg++ and Ca++ ions from country rock through base exchange reactions. Negative CAI values are recorded at Terala, Rayavaram and Nehrunagar, which indicate exchange of Na+ and K+ from the rock as cation-anion exchange reaction (chloro-alkaline disequilibrium).
TDS range from 91 to 7100 ppm (Avg. 835 ppm) and exceed the prescribed limit of drinking water around Mutukuru, Durgi, Rayavaram, Khambampadu and Ammanizamalmadaka areas. Scanty rainfall and insufficient groundwater recharge are the prime factors responsible for high salinity in the area. Fluoride content ranges from <1 to 3.8 ppm and contaminated areas were identified around Macherla (1 sq km; 3.8ppm), Mandadi (1 sq km, 2.1ppm) and Adigopula (2 sq km, <1 to 3.7 ppm). The % Na+ content varies from 17 to 85 with the mean value of 57, and eighty (80) samples showed higher %Na+ in comparison to the prescribed limit of 60 for irrigation water. Sodium Adsorption Ratio (SAR) and % Na+ in relation to total salt concentration indicate that groundwater (51%) mostly falls under doubtful to poor quality for irrigation purpose. Groundwater of Adigopula village is fluoride contaminated and remedial measures are suggested to improve the water quality.
Keywords
Chloroalkaline Indices (CAI), Potability, Total Dissolved Solids (TDS), Fluoride, Sodium Absorption Ratio (SAR), Macherla-Karempudi, Andhra Pradesh.- Occurrence of Uranium in Metasedimentary Enclaves Within Basement Granite, Near Peddur and Kottur, Karimnagar District, Andhra Pradesh
Authors
1 Atomic Mineral Directorate for Exploration and Research, Begumpet, Hyderabad - 560 629, IN
2 Atomic Mineral Directorate for Exploration and Research, North Eastern Region, Shillong - 793 011, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 3 (2010), Pagination: 247-250Abstract
Several radioactive anomalies due to uranium and thorium, associated with the mesedimentary enclaves (Archaean) within granite (Archaean to Early-Proterozoic) have been recorded in parts of Karimnagar Granulite Terrain, Karimnagar Dist. At Peddur and Kottur, Uraninite has been identified in the samples of metasediments. The metasediment from these two places have been subjected to granulite facies of metamorphism and host high values of uranium with negligible thorium. In Peddur, samples of metasediments have assayed as high as 1.96% U3O8 with negligible thorium, and in Kottur up to 0.059% U3O8. Leaching studies on these samples have indicated that most of the U3O8 present is leachable. This discovery has opened up the possibility of finding uranium mineralisation in Archaean metasediments and thus provides a thrust for uranium exploration in similar geological environs in India. Further, the basement granite along with the metasedimentary enclaves has the potential to act as a provenance for a possible unconformity type or sandstone type U-deposit in the rocks of overlying Pakhal and Gondwana Supergroup, in Pranhita-Godavari Basin, situated to the east of this area.Keywords
Uraninite, Karimnagar Granulite Terrain, Metasediment, Peddur, Kottur, Andhra Pradesh.- Studies on Tapiolite from Arehalli Pegmatite, Hassan District, Karnataka
Authors
1 Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 4 (2011), Pagination: 349-354Abstract
Tapiolite hosted in lithium-caesium-tantalum (LCT)-type granitic pegmatite, near Arehalli, of Holenarsipur schist belt (HSB), occurs as euhedral crystals within the muscovite books or in association with columbite-tantalite. In this study, compositional and crystallographic characteristics of the tapiolite are presented. The tapiolite is Ta-rich (79.8% Ta2O5) and also Fe-rich (13.1% FeO) with minor amounts of Nb (3.80% Nb2O5) and Mn (0.30% MnO2), and is a Fe-end member of the FeTa2O6-MnTa2O6 series, ferrotapiolite. The tapiolite has very restricted compositional range. Calculated structural formula of the investigated tapiolite is [(Fe0.27 Mn0.66)0.93 (Nb0.45 Ta1.57 Ti0.004 Sn0.03)2.027O6].
The observed unit-cell dimension of studied tapiolite (ao = 4.7582Å and co = 9.2186Å) matches with the value published in the international centre for diffraction data (ICDD) card for tapiolite standard (ao = 4.750 Å, co = 9.205 Å), suggesting that the investigated mineral belongs to the category of ordered tapiolite. Furthermore, crystallographic data also reveal that studied tapiolite has not been affected by chemical substitutions. Restricted composition of tapiolite coupled with minor to trace content of Fe3+, Mn, Sn, Ti, Sc and REEs support this interpretation.
Keywords
Tapiolite, Mineralogy, Pegmatite, Arehalli, Karnataka.References
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- Hydrouranium Anomalies as an Effective Tool in Exploration of Concealed Unconformity Related U-Deposit in Srisailam Subbasin, Andhra Pradesh - Case Study from Chitrial Area
Authors
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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