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Narasimhan, D.
- Occurrence of Palladian Melonite in Jaduguda Uranium Deposit, Singhbhum Shear Zone, Bihar
Authors
1 Ore Dressing Section, Bhabha Atomic Research Centre, Begumpet, Hyderabad - 500 016, IN
2 Department of Earth Sciences, University of Cambridge, GB
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 6 (1998), Pagination: 759-760Abstract
Palladian melonite, containing upto 7% palladium is reported for the first time from the uranium ores, Jaduguda Mines.Keywords
Mineralogy, Palladian Melonite, Uranium, Singhbhum, Bihar.
- Parkerite from Rakha Copper Deposit, Singhbhum Shear Zone, Bihar, India
Authors
1 Ore Dressing Section, BARC, Chandralok, 3rd Floor, 111, S.D. Road, Secunderabad 500003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 21, No 6 (1980), Pagination: 295-298Abstract
Parkerite, a rare nickel bismuth sulphide has been identified from Rakha copper deposit of Singhbhum shear zone. The mineral is associated with chalcopyrite, pentlandite bismuthinite and native bismuth. EPMA indicated the composition to be Ni3.17. Bi2.06 S2. The mineral has low indentation hardness (VHN 119 Kg/mm2) and the reflectivity ranges from 41.0% (470 nm) to 49.0% (589 nm).Full Text
- Alteration of Beach Sand Ilmenite from Manavalakurichi, Tamil Nadu, India
Authors
1 Ore Dressing Section, Bhabha Atomic Research Centre, Begumpet, Hyderabad - 500 016, IN
2 Nuclear Physics Division, B. A. R. C., Bombay - 400085, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 23, No 4 (1982), Pagination: 168-174Abstract
The study shows that the alteration of ilmenite has taken place according to the two stage model proposed by Grey and Reid (1975). Identification of the intermediate altered compound, pseudorutile, was found difficult in earlier studies by optical and X-ray diffraction methods, because of the occurrence of this phase in altered ilmenite in very fine grain size (30 Å), its poor crystallinity and coincidence of many of the diffraction lines with those of other phases. The present study has shown that the Mossbauer technique is more suitable in the identification and estimation of this phase.
The relative amount of pseudorutile increases progressively in the magnetic fractions in the following order: 0.30 - 0.35 amps (5%), 0.25 - 0.30 amps (40%), 0-0.25 amps (75%) and 0.35 - 0.50amps (95%), indicating that the magnetic susceptibility of the grains is increasing initially with progressive pseudorutile formation, and decreasing in the later stages of alteration. Reflectivity and hardness are also increasing up to the stage of pseudorutile formation and decreasing in the later stages.
- Uraniferous Organic Matter in the Sandstone-Type Uranium Ore from Domiasiat, Meghalaya, India
Authors
1 Ore Dressing Section, Bhabha Atomic Research Centre, Begumpet, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 45, No 4 (1995), Pagination: 407-425Abstract
Uranium in the sandstone-hosted uranium deposit at Domiasiat, Meghalaya is mainly associated with organic matter (OM), which is also enriched in several trace elements, viz. Zn, Pb, Ni, V, Co, Ba, Sn, Mo, Cr, Ag, P etc. This paper is an attempt to characterize and discuss the origin of the OM and the associated uranium.The OM occurs in several forms - lumps, layers, veins, dispersions, fracture fillings, coatings and impregnations. Based on structural features and optical properties, seven types of OM are identified. The structural and compositional features indicate that the OM is type II kerogen with macerals mainly belonging to liptinite group. Some of the primary structures have acted as loci of deposition of uraninite and other inorganic minerals like pyrite, marcasite, sphaleri'te and apatite, thereby giving rise to certain interesting textural features. Development of asecondary granular structure and bIades of secondary OM are features related to maturation. Uranium occurs in the form of uraninite of three generations, minor coffinite and a distinct organo-uranyl complex.
Both the South Khasi granite batholith and the tuffaceous matter related to Sylhet Trap episode appear to be the source for various inorganic elements enriched in the OM. From structures and association it appears that uranium fixation in the OM has taken pIace both due to anaerobic reduction by bacterial H2S and complexation to form organo-uranyl complexes. The latter, on maturation, was reduced to form fine precipitates of uraninite dispersed in the OM. It is suggested that the maturity of OM, extending up to semi-anthracitic stage, has taken place due to radiolysis and radiogenic heat.
Keywords
Organic Matter, Uranium Ore, Sandstone, Domiasiat, Meghalaya.- Tungsten Mineralisation at Khobna, Maharashtra Fluid Inclusion Studies
Authors
1 Ore Dressing Section, Bhabha Atomic Research Centre, Begumpet, Hydembad - 500016, IN
2 Department of Earth Sciences, Indian Institute of Technology, Powai, Bombay - 400076, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 3 (1997), Pagination: 343-346Abstract
Fluid inclusion study has indicated two distinct stages of mineralisation: one with higher TH and lower salinity (greisens) and the other with lower TH and slightly higher salinity (quartz vein) conditions. These mark the formation conditions of wolframite and scheelite respectively.Keywords
Economic Geology, Fluid Inclusions, Tungsten, Wolframite, Maharashtra.- Occurrence of Gold and Silver in Khetri-Kolihan Copper Ores, Rajasthan, India
Authors
1 Ore Dressing Section, Bhabha Atomic Research Centre, Begumpet, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 4 (1997), Pagination: 511-513Abstract
Native gold, etectrum with a wide spectrum of compositional variations between gold and silver, and native silver are identified based on ore microscopic and scanning electron microscopic studies in the copper ores of Khetri-Kolihan, Rajasthan and probable mode of origin is discussed.Keywords
Economic Geology, Gold, Silver, Copper, Rajasthan.- Gold in Copper-Uranium Ores of Singhbhum Shear Zone, Bihar
Authors
1 B-41, Taxila Apartments, Sardar Patel Road, Secunderabad 500 003, IN
2 Ore Dressing Section, Bhabha Atomic Research Centre, Begumpet, Hyderabad 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 1 (1999), Pagination: 37-42Abstract
Nature of occurrence of native gold in the uranium ore from Jaduguda and copper ore from Mosabani in the Singhbhum Shear Zone, Bihar, is described. Preliminary data on the gold contents of different ore deposits along the shear zone, and their beneficiation products, are also reported. The native gold particles appear to be of detrital origin.Keywords
Economic Geology, Gold, Detrital Origin, U-Cu Ores, Singhbhum Shear Zone, Bihar.- Status of Syzygium gambleanum Rathakr. & Chithra (Myrtaceae) from Southern Western Ghats, India
Authors
1 Department of Botany, Madras Christian College (Autonomous), Chennai 600 059, IN
2 Asoka Trust for Research in Ecology and Environment, Bangalore - 560 024, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 45, No 1-4 (2003), Pagination: 111-120Abstract
Syzygium gambleanum Rathakr. & Chithra, an endemic species, was relocated after a lapse of about 120 years from its type locality. This paper deals with description, critical notes, observations and threat status of this taxon.Full Text
- Plant Sources of Formulated Homoeopathic Drugs
Authors
1 Department of Botany, Madras Christian College, Tamil Nadu, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 46, No 1-4 (2004), Pagination: 289-299Abstract
A survey was conducted in the homoeopathic pharmacies in Chennai to study the plant sources of formulated homoeopathic drugs that are common and popularly sold in commercial outlets. This study deals with 127 homoeopathic medicinal plants that are used in various formulated preparations such as cosmetics, drops, oils, ointments, powders, tablets and tonics. Medicinal plants that are exclusively used as mother tinctures diluted and prescribed by homoeopathic practitioners for treatment are excluded. Many practitioners of homoeopathic system prescribe formulated drugs manufactured by the pharmaceutical companies that specialize in homoeopathic drugs. Another survey was conducted to explore the most frequent prescriptions given by the homoeopathic practitioners in Tamil Nadu. Plant sources of these prescriptions are studied. It is found that 34 of these plant sources are commonly used as ingredients in many formulated drugs sold in the commercial outlets.Full Text
- Flowering Plants of Sholas and Grasslands of the Nilgiris
Authors
1 Department of Botany,Centre for Floristic Research, Madras Christian College, Tambaram, Chennai 600 059, IN
Source
Current Science, Vol 107, No 2 (2014), Pagination: 309-309Abstract
No Abstract.Full Text
- Association of Authigenic Apatite with Uraniferous Organic Matter at Domiasiat, Meghalaya and its Genetic Implications
Authors
1 Ore Dressing Section, Bhabha Atomic Research Centre, Begumpet, Hyderabad - 500 016, IN