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- R. Dhana Raju
- Arjun Panda
- M. Vasudeva Rao
- Minati Roy
- S. G. Vasudeva
- D. Bhattacharya
- Dhirendra Kumar
- Pawan Misra
- G. B. Joshi
- Bikash Sengupta
- R. K. Purohit
- A. K. Paul
- Bikash Sen Gupta
- K. Mahendra Kumar
- G. Behra
- P. S. Parihar
- R. K. Gupta
- Jamger Singh
- S. Vijayalakshmi
- T. R. Mahalingam
- C. R. M. Rao
- U. K. Pandey
- D. V. L. N. Sastry
- B. K. Pandey
- T. P. S. Rawat
- Rajeeva Ranjan
- V. K. Shrivastava
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
Roy, Madhuparna
- Fluid flow during contact metamorphism: Petrographic evidence from the uranium prospect at Tummalapalle in the southwestern part of Cuddapah Basin, India
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Authors
Affiliations
1 Regional Centre for Exploration and Research, Atomic Minerals Division, Department of Atomic Energy, Bangalore-560 072, IN
1 Regional Centre for Exploration and Research, Atomic Minerals Division, Department of Atomic Energy, Bangalore-560 072, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 45, No 4 (1995), Pagination: 439-444Abstract
In the uranium prospect at Tummalapalle in the southwestern part of Cuddapah basin, fluid flow during contact metamorphism is documented in a vein-mineral-assemblage of a metadolerite intruding the carbonate rocks and shale of the Vempalle Formation of the mid-Proterozoic Lower Cuddapah Supergroup. The minerals in the vein are calcite, quartz, Mg-chlorite and Fe-chlorite formed in that order due to fluid-infiltration-driven volatilization reactions involving CO2- and H2O- fluid having an external source in the nearby sedimentary rocks. The observed sequential vein-mineral assemblage is considered as a petrographic evidence of 'infiltrating fluid mechanism during metamorphism', proposed first by Ferry (1980), as well as for 'batch volatilization' of Valley (1986).Keywords
Metamorphism, Uranium Mineralisation, Cuddapah Basin, Andhra Pradesh.
- Uranium Mineralisation in the South-Western Part of Cuddapah Basin: A Petromineralogical and Geochemical Study
Abstract Views :205 |
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Authors
Affiliations
1 Atomic Minerals Division, Department of Atomic Energy, Bangalore 560072, IN
1 Atomic Minerals Division, Department of Atomic Energy, Bangalore 560072, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 42, No 2 (1993), Pagination: 135-149Abstract
Two types of uranium mineralisation occur in the south-western part of Cuddapah basin, viz., stratabound type hosted by impure dolostone of the Vempalle Formation of the Papaghni Group and structuralIy-controlled type hosted by deformed basement grani toid. The carbonate-hosted type occurs over a 140 km-long belt from Reddipalle in the west to Maddimadugu in the east with promising mineralisation at Tummalapalle, Rachakuntapalle and Gadankipalle. It is sandwiched between a Iower massive limestone and upper shale and cherty limestone. The rnineralised carbonate rock is a stromatolite-bearing 'siliceous, calcitic doIostone ' (SCD+phosphate) associated with other impure dolostones, quartzite, chert, phyllite, conglomerate, and intrusive dolerite a nd basalt. Uranium mineralisation occurs along the bedding plane, carbonate-phosphate conlact, micro-stylolites, grain boundaries of clasts and within pelioids, mainly in the form ultrafine pitchblende, in intimate association with pyrite and as disseminations in cellophane-rich parts, besides as minor phases ot'coffi~itea nd U-Ti compIex. The associated ore minerats include pyrite, molybdenite, chalcopyrite, bornite, digenite and covellite. The fertile basement granite fs.1.) is the source of uranium and the mineralisation, which appears to be polygenetic(syn-, dia- and epi-genetic), is controIled by impure nature of dotostone and organic activity. The mineralisation in the southern part of the belt in Cuddapa h district is typically molybdenum-rich, whereas the northern portion, in parts of Anantapur district, is characterised by high content of copper. The rnineralised SCD in the S/SE parts is also marked by high content of P, V and Pb, in addition to Mo. There is a good positive correlation of U with Pand V (r : 0.98 and more).
The structurally-controlled uranium mineralisation occurs around Rayachoti (outside the SW margin of Cuddapah basin) along a number of fracture zones within the basement granitoid, and is hosted by mylonites and cataclasites indicative of intense dislocation metamorphism. Of many such zones, the one between T. Sundupalle and Sanipaya is promising and has a strike extension of about 16 km. This mineralisation is epigenetic hydrothermal vein-type, mainly represented by coffinite, pitchblende, U-Ti. complex and secondary uranium minerals.
Keywords
Uranium Mineralisation, Stratabound Deposit, Hydrothermaltype, Cuddapah Basin, Andhra Pradesh.- Temperature Dependent Textural and Chemical Variations in Uraninites from Diverse Geological Environments of India
Abstract Views :210 |
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Authors
Minati Roy
1,
Madhuparna Roy
1
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, New Delhi - 110 066, IN
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, New Delhi - 110 066, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 2 (2008), Pagination: 155-167Abstract
Uraninite contains primarily UO2 besides a few other oxides, viz radiogenic PbO, ThO2 and minor amount of (RE)2O3in varying proportions. The environment and process of uraninite formation control its variation in chemical composition and optical properties. Uraninites generally form in high temperature magmatic granites and pegmatites, with repeated remobilization of uranium lead to its economic concentration, by hydrothermal/metasomatic activity, metamorphic, sedimentary phenomena or conjunction of one or more of these processes spread in space and time. Petrology and mineral chemistry of uraninites help in inferring the processes of uranium mineralisation, which have important bearing on exploration and ore beneficiation.The present study of uraninites from some important uraniferous/thoriferous horizons in parts of India shows that they are controlled by temperature of formation. These uraninites may be classified as high- and low-temperature types. The high temperature type occurs in magmatic rocks, high temperature hydrothermal veins, migmatites and high temperature metasomatites. The typical high temperature magmatic/migmatic type uraninites occurring in granite, pegmatites and migmatites, are coarse, euhedral to subhedral grains, of high reflectivity and high micro hardness, and occur as inclusions within gangue minerals and also are associated with oxides, sulphides, rare earth and rare metal minerals. Chemically, such uraninites are marked by higher concentration of ThO2, (RE)2O3, Y2O3 and lower content of SiO2, CaO and TiO2.
The low temperature type found in sedimentary uraninites is invariably fine grained, anhedral with lower reflectivity and hardness, distributed along weak planes and associated with sulphides with or without organic matter. In such uraninites, the concentration of ThO2, (RE)2O3, Y2O3 is relatively lower and they have substantial amount of SiO2 CaO and TiO2.
The high temperature uraninites formed by fluid activity in veins and metasomatites are anhedral to euhedral grains, coarse to fine in grain size and are associated with both opaque oxides, sulphides and occasionally with organic matter. These uraninites contain variable amount of ThO2, moderate to high (RE)2O3 and high Y2O3 and low SiO2, CaO and TiO2.
Keywords
Uraninite, High- and Low-Temperature Types, India.- A Note on Carbonate Rock with Igneous Affinity from Jungel Valley, Sonbhadra District, Uttar Pradesh, Central India
Abstract Views :220 |
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, NR, New Delhi - 110 066, IN
2 Flat No. B-170, Kendnya Vihar, Sector-51, Noida, IN
1 Atomic Minerals Directorate for Exploration and Research, NR, New Delhi - 110 066, IN
2 Flat No. B-170, Kendnya Vihar, Sector-51, Noida, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 6 (2008), Pagination: 808-814Abstract
The Lower Proterozotc (1800-2400 Ma) Jungel Valley mafic-ultramatic complex (JVMUC) is an integral pait of Mahakoshal greenstone belt in district Sonbhadra. The complex is known for its diversity of locks like alkali olivine basalt, kimbeihte and ultramalic lamprophyre. In addition to these, a carbonate rich rock having igneous affinity is being reported for the first time from this complex High CaO, CO2, Sr and Ce with low SiO,, A12O8 and TiO2 characterise this rock. However, these rocks are not significantly enriched in incompatible elements and REE, implying that these may have possibly formed by partial melting of a depleted mantle at shallow depth. The geochemical characters combined with association of mantle derived rocks, presence of high level of carbonate in the lamprophyre and absence of sedimentary limestone in the area point towards an igneous origin, probably as a residual concentrate of a differentiated Kimberlite-Ultramahc lamprophyre sequence Sr isotope data, which fall well within the range of reported carbonatites of India, suggest moderate crustal contamination. The mafic-ultramafic suite together with the carbonate rocks developed in Son-Naimada nit zone are interpreted to be coeval with the intrusive syenite pluton, alkali gabbio and lamprophyres of the adjoining areas and is related to the development of Mahakoshal greenstone belt.Keywords
Jungel Valley, Caibonate Lamprophyre, Mahakoshal Greenstone Belt, Uttar Pradesh.- Three-Phased Temporal Evolution of the Jhirgadandi Granite Complex, Sonbhadra District, Uttar Pradesh
Abstract Views :197 |
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, New Delhi-11 0066, IN
1 Atomic Minerals Directorate for Exploration and Research, New Delhi-11 0066, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 5 (2007), Pagination: 730-744Abstract
Field observations, petromineralogical and geochemical studies on the locks of Jhirgadanpdi pluton indicate three phases of igneous activity, compositionally ranging from gianodiorite, Quartz-Monzonite to granite. The wide spread intermediate phase of this suite shows anomalous concentration of U, Ce and Th as compared to average granite and enrichment of K, Rb, Ba relative to Zr, Nb and Y. The radioactive minerals identified are thorite, uranothorite, allanite monazite and samaiskite Molybdenite and chalcopyite are the other are minerals Presence of REE (1 are earth element) minerals, distibution pattern of LIL (large Ion lithophile) elements, various elemental ratios and increasing metaluminous tendency indicate moderate degree of differentiation Petromineralogical study of rocks suggests partial melting of a magic source of lower crustal rocks Geochemical data suggests that the granitic rocks of the three phases are comagmatic. Available age data together with tectonic considerations indicate that the magmatic activity is relaled to the development of Mahakoshal greenstone belt which might have culminated with the emplacement of Post-Tectonic Jhirgadandi sulte (∼ 1800 Ma), possibly under the influence of a mantle plume.Keywords
Jhirgadandi Granite Post-Tectonic, Mantle Plume Radloactive Minerals Sonbhadra District, Uttar Pradesh- Petrography and Mineral Chemistry of the Radioactive Migmatitic Rocks around Kudri, Sonbhadra District, U.P. and its Implication on Uranium and Rare Earth Mobility and Genesis
Abstract Views :182 |
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad-500 0 16, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, New Delhi - 110 066, IN
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad-500 0 16, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, New Delhi - 110 066, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 1 (2006), Pagination: 87-94Abstract
The Precambrian migmatites around Kudri host uranium, rare earth and zirconium mineralization, manifested, respectively in the form of discrete uraninite, allanite and zircon. Mineralization is mostly in the biotite-Rich melanosome (restite), albite-Rich leucosome and mesosome (mobilizate). Uraninite with UO2 content of 79.93-82.45% (av.81.36%), and content of high Th (ThO2:2.98-5.71%, av.4.37%) and high REE (RE2O3: 0.82-2.11, av.1.41%) and chemical age (736-929 Ma, av.824 Ma) of uraninite (n=14) point towards its origin during Neoproterozoic (av. 824 Ma) probably by epigenetic, high-Temperature, synmagmatic origin which later subjected to dissolution and alteration by hydrothermal process. However, textural evidence of corrosion of erstwhile euhedral uraninite suggests its subsequent dissolution and alteration, together with expulsion of REE, possibly by a saline, moderately acidic hydrothermal (100-300°C), reducing solution at a lower pressure, related to regional tectonic episode.Keywords
Petrography, Mineral Chemistry, Migmatite, Uraninite Dissolution, Kudri, U.P.- A Rare Calcium Rich Uraninite from Anjangira Area, Sonbhadra District, Uttar Pradesh
Abstract Views :200 |
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Hyderabad - 500 016, IN
2 Atomic Minerals Directorate for Exploration and Research, New Delhi - 110 066, IN
1 Atomic Minerals Directorate for Exploration and Research, Hyderabad - 500 016, IN
2 Atomic Minerals Directorate for Exploration and Research, New Delhi - 110 066, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 3 (2005), Pagination: 296-300Abstract
A variety of high calcic uraninite showing 3.26- 10.69 % of CaO has been identified in 'Anjangira' Uranium occurrence hosted by pegmatoid leucosome within migmatites forming part of Chhotanagpur Granite Gneiss Complex (CGGC), in Sonbhadra district, U.P. It is one of the two distinct types of uraninite, which occurs as inclusions within biotite and albite besides few grains along with microcline and quartz. The less abundant high calcic type of uraninite can be easily recognized under microscope due to its habit of occurrence encircled with the pale green rim of clayey matrix. The mode of occurrence of the two types of uraninite such as euhedral, rounded, corroded and in fracture form, rules out any specific mineralogical control and a metasomatic origin seems likely. Type I uraninite has an average chemical age 751 Ma and Type II (calcic) shows a variation from 621-812 Ma.Keywords
Uraninite, Pegmatoid Leucosome, Migmatite, Mineral Chemistry, Anatexis, Anjangira, Sonbhadra, Uttar Pradesh.- Rare Metal and Rare Earth Mineralisation Hosted in - Pegmatitic Injections within Magnetite-Bearing Granitoid at Jaurahi, Sonbhadra District, U. P.
Abstract Views :186 |
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research Shillong 793011, IN
2 Atomic Minerals Directorate for Exploration and Research New Delhi 10066, IN
3 Atomic Minerals Directorate for Exploration and Research Hyderabad 500016, IN
1 Atomic Minerals Directorate for Exploration and Research Shillong 793011, IN
2 Atomic Minerals Directorate for Exploration and Research New Delhi 10066, IN
3 Atomic Minerals Directorate for Exploration and Research Hyderabad 500016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 55, No 4 (2000), Pagination: 439-442Abstract
Pegmatitic injections within the magnetite bearing granitoid host rare metal and rare earth mineralisation at Jaurahi, Sonbhadra district, Uttar Pradesh. The ore minerals identified are columbite, eschynite, samarskite, fergusonite, monazite, thorite, uranothorite and zircon in association with magnetite, ilmenite and rutile. Samples of mineralised pegmatite have analysed 0.65 to 4.42% Nb and 0.55 to 4.85% Y.Keywords
Economic Geology, Pegmatite, Columbite, Granitoid, Chhotanagpur Gneissic Complex, Sonbhadra, Uttar Pradesh.- Platinum Group Elements in REE-Th-Zr-Ti-Rich Tremolite-Actinolite Rock from Vattalakki, Palghat District, Kerala
Abstract Views :190 |
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Authors
Affiliations
1 Atomic Minerals Division, Dept. of Atomic Energy, Bangalore - 560 072, IN
2 Indira Gandhi Centre for Atomic Research, Dept. of Atomic Energy, Kalpakkam - 603 102, IN
3 Chemical Laboratory, Geological Survey of India, Madras - 600 032, IN
4 Atomic Minerals Division, Dept. of Atomic Energy, New Delhi - 110066, IN
1 Atomic Minerals Division, Dept. of Atomic Energy, Bangalore - 560 072, IN
2 Indira Gandhi Centre for Atomic Research, Dept. of Atomic Energy, Kalpakkam - 603 102, IN
3 Chemical Laboratory, Geological Survey of India, Madras - 600 032, IN
4 Atomic Minerals Division, Dept. of Atomic Energy, New Delhi - 110066, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 4 (1998), Pagination: 523-526Abstract
Platinum Group Elemental (PGEs-Pt, Ir, Pd, Rh and Ru) contents, determined by ICP-MS, are reported in a rare REE-Th-Zr-Ti-rich ultrabasic tremolite-actinolite rock from Vattalakki, Kerala. Data on PGE, together with unusually high contents of REE, Th, Zr and Ti at percent level, indicate this rock as 'anomalous'.Keywords
Economic Geology, PGE, REE-Rich Metaultramafite, Kerala.- Geochronological (Rb-Sr and Sm-Nd) Studies on Intrusive Gabbros and Dolerite Dykes from Parts of Northern and Central Indian Cratons: Implications for the Age of Onset of Sedimentation in Bijawar and Chattisgarh Basins and Uranium Mineralisation
Abstract Views :216 |
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Authors
U. K. Pandey
1,
D. V. L. N. Sastry
1,
B. K. Pandey
1,
Madhuparna Roy
2,
T. P. S. Rawat
2,
Rajeeva Ranjan
3,
V. K. Shrivastava
3
Affiliations
1 Atomic Mineral Directorate for Exploration and Research, Geochronology Lab., Begumpet, Hyderabad - 500 016, IN
2 Atomic Mineral Directorate for Exploration and Research, Northern region, New Delhi - 110 066, IN
3 Atomic Mineral Directorate for Exploration and Research, Central Region, Nagpur - 440 001, IN
1 Atomic Mineral Directorate for Exploration and Research, Geochronology Lab., Begumpet, Hyderabad - 500 016, IN
2 Atomic Mineral Directorate for Exploration and Research, Northern region, New Delhi - 110 066, IN
3 Atomic Mineral Directorate for Exploration and Research, Central Region, Nagpur - 440 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 1 (2012), Pagination: 30-40Abstract
The Dargawan gabbros intrusive into the Moli Subgroup of Bijawar Group, yielded Rb-Sr whole rock isochron age of 1967 ± 140 Ma. Based on the oldest age from overlying Lower Vindhyan (1.6Ga) and the underlying youngest basement ages (2.2 Ga), the time range of Bijawar sedimentation may be assigned as 2.1-1.6 Ga (Paleoproterozoic). Sm-Nd Model ages (TDM), obtained, for Dargawan gabbros, is c. 2876 - 3145 Ma. High initial 87Sr/ 86Sr ratio of 0.70451 (higher than the contemporary mantle) and negative εNdi (at 1.9 Ga) value of -1.5 to -4.5, indicate assimilation of Archaean lower crustal component by the enriched mantle source magma at the time of gabbroic intrusion. The dolerite, from Damdama area, which is intrusive into the basement and overlying sediments of Chandrapur Group in the central Indian craton, yielded Rb-Sr internal isochron age of 1641 ± 120 Ma. The high initial 87Sr/86Sr ratio of 0.7098 and εNdi value of -3.5 to -3.7 (at 1.6 Ga) is due to contamination of the mantle source magma with the overlying sediments. These dolerites have younger Sm-Nd Model ages (TDM) than Dargawan gabbros as c. 2462 - 2675 Ma, which is similar to the age of the Sambalpur granite, from which probably sediments to this part of Chattisgarh basin are derived. Hence mixing of sediments with the Damdama dyke during its emplacement, gives rise to high initial 87Sr/86Sr and low initial 143Nd/144 ratios for these dykes. The c. 1600 Ma age indicates minimum age of onset of the sedimentation in the Chandrapur Group of Chattisgarh basin. Both the above mafic intrusions might have taken place in an intracratonic rift related (anorogenic) tectonic setting. This study is the first reliable age report on the onset of sedimentation in the Chandrapur Group. The total minimum time span of Chandrapur and Raipur Group may be 1.6 Ga to 1.0 Ga (Mesoproterozoic). The unconformably underlying Shingora Group of rocks of Chhattisgarh Supergroup thus indicates Paleoproterozoic age (older than 1.6 Ga). Most part of the recently classified Chattisgarh Supergroup and Bijawar- Vindhyan sequence are of Mesoproterozoic-Paleoproterozoic age and not of Neoproterozoic-Mesoproterozoic age as considered earlier. Petrographic study of basic dykes from Damdama area (eastern margin of Chattisgarh Supergroup) indicated presence of primary uranium mineral brannerite associated with goethite. This is the evidence of mafic intrusive providing geotherm and helping in scavenging the uranium from the surrounding and later alterations causing remobilisation and reconcentration of pre-existing uranium in host rocks as well as in mafic dyke itself otherwise mafic rocks are poor source of uranium and can not have primary uranium minerals initially. It can be concluded that mafic dykes have role in uranium mineralisation although indirectly.Keywords
Geochronology, Age of Sedimentation, Uranium Mineralisation, Northern and Central Indian Cratons.References
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