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- Chanchal Sarbajna
- P. Krishnamurthy
- D. C. Banerjee
- B. K. Mohapatra
- R. Natarajan
- R. K. Sahoo
- J. K. Mohanty
- S. K. Das
- G. Friedrich
- N. Murali Krishna
- G. V. G. K. Murthy
- P. B. Maithani
- Bikash Sengupta
- Madhuparna Roy
- R. K. Purohit
- Bikash Sen Gupta
- P. P. Mishra
- P. P. Singh
- Rajeev
- M. Das
- S. M. Monalisa
- R. K. Mishra
- A. A. Pradhan
- S. Goswami
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
Paul, A. K.
- Mineralogical and Chemical Characteristics of Complexly-Zoned Columbite-Tantalite from the Rare Metal Pegmatites of Southern Karnataka
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad - 500 016, IN
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 56, No 5 (2000), Pagination: 557-571Abstract
Detailed mineralogical and chemical studies by EPMA on the Nb-Ta minerals from the rare metal pegmatites of southern Karnataka have revealed wide compositional variations, and the presence of some new minerals like tapiolite and microlite, hitherto unreported from these pegmatites. Back scattered electron (BSE) images have indicated complex zoning patterns such as oscillatory, patchy and/or their combinations, associated with replacement of columbite-tantalite by microlite, manifested by the variations of Nb2O5, Ta2O5, FeO and MnO. Such features, although known from a few rare meral pegmatites of the world, are being recorded here for the first time in India. Oscillatory zones in columbite-tantalites are manifested as alternating dark and light grey coloured bands, of which darker bands are Nb-rich (30-300 μM thick) and lighter bands are Ta-rich (125-450 μm thick). The wider zones may, in turn, consist of a group of very fine sub-zones (1-50 μm) of slightly varying composition: Patchy zoned crystals exhibit corroded remnants of early formed columbite-tantalite (with 39.73-44.02% Ta2O5), surrounded by later formed zones which are enriched in Ta2O5 (up to 50.99 %) in columbite-tantalite leading to the formation of microlite containing up to 73.4% Ta2O5. The zoning of the columbite-tantalites has been attributed to periodic changes in the composition of the major components such as Nb, Ta, Fe and Mn in the pegmatite fluid system, apparently influenced by the late stage fractionation of volatiles. This ultimately generated fluids rich in Ta and Na, resulting in resorption and replacement with patchy zoning of early formed, zoned columbite-tantalites.Keywords
Columbite-Tantalite, Rare Metal Pegmatite, Zoning, Ore Mineralogy, Southern Karnataka.
- Morpho-Chemistry of Rutile in Dengura Manganese Ore Bodies of Koira Valley, Orissa
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Authors
Affiliations
1 Regional Research Laboratory, Bhubaneswar 751 013, IN
2 National Geophysical Research Institute, Hyderabad 500 007, IN
3 Department of Geology, Utkal University, Bhubaneswar 751 004, IN
1 Regional Research Laboratory, Bhubaneswar 751 013, IN
2 National Geophysical Research Institute, Hyderabad 500 007, IN
3 Department of Geology, Utkal University, Bhubaneswar 751 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 31, No 5 (1988), Pagination: 484-487Abstract
Minute discrete grains of rutile present in manganese ores of Dengura, Koira valley, Sundergarh district, exhibit imperfect columnar and crystallographic forms and an outstanding illustration of twinning. EPMA and EDAX results indicate the presence of Fe, Mn, Cr, Al, Ba, K and Ta, Nb in minor proportion, in rutile crystals. Some of these clements are either present in limited solid solution or later got introduced into its structure during late epigenetic processes. These are detrital grains, pre-existing in the host shale and later affected by solution during epigene manganese are formation.- Small-Scale Structures in Tuffs Associated with Iron-Ore Volcanics of Barsua Valley, Sundargarh District, Orissa, India
Abstract Views :148 |
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Authors
Affiliations
1 Regional Research Laboratory, Bhubaneswar 751013, Orissa, IN
2 P. G. Department of Geology, Utkal University, Bhubaneswar 751004, Orissa, IN
1 Regional Research Laboratory, Bhubaneswar 751013, Orissa, IN
2 P. G. Department of Geology, Utkal University, Bhubaneswar 751004, Orissa, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 33, No 4 (1989), Pagination: 309-320Abstract
The paper records small-scale primary and secondary structures in different tuffaceous rocks of Barsua Valley, Sundargarh district, Orissa, India. The tuffs of acid, basic and intermediate composition are structurally both isotropic and anisotropic and form a part of the sheet-like tuff-tufflava-lava sequence of the Precambrian Iron-Ore Volcanics.
The primary bedding structures like tuff layers and laminations. cross-lamination and graded-bedding; secondary (deformational) structures like small-scale polyphase folds, their interference structures and associated boudins; distinctive structures, viz., small-scale faults etc. are described. Pre-tectonic soft sediment deformational structures are obscured by the imprint of tectonic structures.
- Framboidal-Colloform-Recrystallized Pyrite in Volcanic Tuffs of Barsu an Valley, Orissa
Abstract Views :174 |
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Authors
Affiliations
1 PG Department of Geology, Utkal University, Bhubaneswar 751 004, Orissa, IN
2 Scientists, Regional Research Laboratory, Bhubaneswar 751 013, Orissa, IN
1 PG Department of Geology, Utkal University, Bhubaneswar 751 004, Orissa, IN
2 Scientists, Regional Research Laboratory, Bhubaneswar 751 013, Orissa, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 37, No 1 (1991), Pagination: 55-62Abstract
Petrographic studies of pyritiferous tuff forming a part of Precambrian lron-Ore Volcanics of Bausuan valley, Sundergarh district, Orissa, reveal interesting textural peculiarities of pyrite. The three textural varieties: framboidal, colloform banded and recrystallized appear both in composite association and as independent units in highly carbonatized tuff. In composite association, the frarnboidal variety constitutes more or less the central part of the globules of colloform banded pyrite (gel pyrite) which in turn is enveloped at the periphery by discontinuous crusts of recrystallized variety. Different intermediate textures of pyrite are described and variations in reflectivity, microhardness, etch behaviour and elemental distribution visMaavis the varieties have been discussed. Average Co/Ni ratio along with the textural manifestations of the pyrite attests its sedimentary origin. Different stages of process of formation of textural varieties are also briefly outlined.Keywords
Ore Mineralogy, Framboidal Pyrite, Sulphide Mineralization, Barsuan, Orissa.- Characterisation of Manganese Ores of a Part of Western Koira Valley, Keonjhar District, Orissa
Abstract Views :190 |
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Authors
Affiliations
1 Regional Research Laboratory, Bhubaneswar, Orissa, IN
2 P. G. Department of Geology, Utkal University, Bhubaneswar, Orissa, IN
1 Regional Research Laboratory, Bhubaneswar, Orissa, IN
2 P. G. Department of Geology, Utkal University, Bhubaneswar, Orissa, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 34, No 6 (1989), Pagination: 632-646Abstract
The Kusumdih ore bodies are lentiformal being interbanded and co-folded with the shale formation of Iron Ore Group and are surficially lateritised. They are of lateritoid type.
Presence of manganese minerals like cryptomelane. pyrolusite, psilomelane, lithiophorite, manganite, coronadite (?), chalcophanite and braunite type is established. Iron is present in three oxy-hydroxide phases, viz., hematite, goethite and lepidocrocite. Cryptomelane and pyrolusite are ubiquitous in all the varieties. Lithiophorite as vug filling occurs in appreciable quantity in laminated and colloform banded varieties. Occurrence of psilomelane and coronadite is also recorded in some varieties. Manganite associated and intergrown with pyrolusite is observed. Hematite and maghemite (?) form the bulk of the ore minerals in manganiferous shale, alongwith subordinate amount of kaolinite and cryptomelane.
Fabrics of different ore minerals observed indicate colloform, replacement, banded. veined, open-space filling, brecciated and intergrowth textures. More than one generations of cryptomelane, pyrolusite, manganite and goethite are recognised. Mineral association of higher oxyhydroxides of manganese and the textural characteristics attest a low-temperature formation of syngenetic sedimentary ore bodies later subjected to oxidation/solution processes during weathering in the zone of lateritisation.
- Chromite Alteration at Boula-Nausahi Igneous Complex, Orissa
Abstract Views :190 |
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Authors
Affiliations
1 Regional Research Laboratory, Bhubaneswar - 751 013, IN
2 Dept. Geology, Utkal University, Bhubaneswar, IN
1 Regional Research Laboratory, Bhubaneswar - 751 013, IN
2 Dept. Geology, Utkal University, Bhubaneswar, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 48, No 3 (1996), Pagination: 265-276Abstract
During Serpentinization of the ultramafic rocks, the accessory chrome spinels are altered at grain margins and/or along fractures to highly reflecting phases of ferritchromit and magnetite which occur as rims around parent chromite. Of these two altered phases, ferritchromit exhibits greater compositional variation. Electron probe microanalysis data indicate that these phases are rich in Fe and poor in Cr, Al and Mg with respect to parent chromite. Magnetite rim is characterised by extreme iron enrichment and marked depletion of Cr, Al and Mg whereas ferritchromit represents intermediate chemical composition between parent chromite and the magnetite outer rim. This compositional variation is due to solid state diffusion of elements from chromite outwards during serpentinization. Textural features, chemical composition and presence of chromiferous serpentine attest genetic relationship between serpentinization and chromite alteration.Keywords
Economic Geology, Chromite Alteration, Mineral Chemistry, Boula-Nausahi, Orissa.- Lithiophorite and Chalcophanite as Secondary Mn-Oxides in Chromite Ores of Sukinda, Orissa, India
Abstract Views :195 |
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Authors
Affiliations
1 Regional Research Laboratory, Bhubaneswar - 751 013, IN
2 Department of Geology, Utkal Universty, Bhubaneswar - 751 004, IN
3 Institut fuer Mineralogie und Lagerstattenlehre der RWTH, Aachen, DE
1 Regional Research Laboratory, Bhubaneswar - 751 013, IN
2 Department of Geology, Utkal Universty, Bhubaneswar - 751 004, IN
3 Institut fuer Mineralogie und Lagerstattenlehre der RWTH, Aachen, DE
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 48, No 5 (1996), Pagination: 583-587Abstract
Minor amount of Mn oxides occur as veins and fracture fillings in some of the chromite ore samples of D-Quarry of South Kaliapani, Sukinda. Microscopic, XRD and EPMA studies indicate that the Mn oxide minerals are lithiophorite and chalcophanite. These minerals are enriched in Ni and Co and were formed by lateritic weathering of ultramafic rocks.Full Text
- Fe-Ti-Oxide Ore of the Mesoarchean Nuasahi Ultramafic-Mafic Complex, Orissa and its Utilization Potential
Abstract Views :159 |
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Authors
J. K. Mohanty
1,
A. K. Paul
2
Affiliations
1 Institute of Minerals and Materials Technology, Bhubaneswar - 751013, IN
2 N/6-419, Jayadev Vihar, Nayapalli, Bhubaneswar - 15, IN
1 Institute of Minerals and Materials Technology, Bhubaneswar - 751013, IN
2 N/6-419, Jayadev Vihar, Nayapalli, Bhubaneswar - 15, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No Spl Iss 5 (2008), Pagination: 623-633Abstract
The iron-titanium (Fe-Ti) oxide ore bodies occur as elongated bands within the gabbro-anorthosite suite of rocks of the Mesoarchean Nuasahi ultramafic-mafic complex. The ore consists mostly of titanomagnetite and ilmenite with minor amounts of hematite, spinel and ulvospinel. Goethite and martite are present as secondary minerals. The titanomagnetite grains display various intergrowth textures such as crystallographic intergrowth, granular intergrowth, graphic intergrowth, resulting from exsolution and oxidation above and below the magnetite-ulvospinel solvus.Bulk rock data shows that the ore contains 0.2 to 0.8 wt% V2O3 and 7.2 to 19.4 wt% TiO2. It is strikingly low in silica (0.4 to 2.8 wt%) indicating near absence of silicate minerals. The bulk rock chemistry in conjunction with mineralogical findings indicate that the ore minerals have undergone alteration resulting in development of martite, goethite and lepidocrocite. Ilmenite-magnetite geothermo-barometry data indicate that the mineralogical assemblage and textural characters have developed within a temperature range of 575 to 925°C and oxygen fugacity of 10-11 to 10-22.5.
The iron-titanium oxide ore bodies are genetically related to the gabbro-anorthosite suite of rocks. The present geometrical disposition of the ore bodies is due to residual liquid injection of the filter pressed - concentrated mass. The predominantly monomineralic nature of the ore body may be due to post cumulus sintering or annealing process. The utilization potential of these ores has been tested in producing a titania-rich slag (TiO2-88%) from which titanium can be recovered easily and for producing Fe-Ti-C composite (Ti-83%), a high value product.
Keywords
Magnetite, Ilmenite, Fe-Ti-C Composite, Ultramafic-Mafic Complex, Nuasahi, Orissa, India.- Thorium-Rich Zircon From the Idar Pegmatite, Sabarkantha District, Gujarat
Abstract Views :199 |
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 016, IN
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.- 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.- Co-Rich Lithiophorite in Manganese Ores of the Bonai-Keonjhar Belt, Orissa
Abstract Views :200 |
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Authors
Affiliations
1 Regional Research Laboratory, Bhubaneswar, IN
2 Department of Geology, Utkal University, IN
1 Regional Research Laboratory, Bhubaneswar, IN
2 Department of Geology, Utkal University, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 4 (2005), Pagination: 407-411Abstract
Co-Rich Lithiophonte is reported for the first time from low-grade Mn ores of the Bonai-Keonjhar belt (Jamda-Koira valley), Orissa. It occurs in two distinct Litho-Host associations, (i) lateritic zone capping Mn-ore horizon and (ii) shear zone-controlled siliceous manganese ore. It mostly appears as thinly banded and as Vug-Filled linings, in close association with cryptomelane. It occurs as Micron-Sized acicular to pea-shaped crystallites in the first litho association and as coarse, radiating crystals showing Zig-Saw pattern arrangement in the second association Co content is low (CoO 0 14 0 8%) in the Fine-Grained variety whereas in the Coarse-Grained variety it ranges up to 2% (CoO 0 14 2 00%). Appreciable quantity of Ni (N10 0 15-1 5%) is observed along with Co only in Coarse-Grained variety. The mechanism of Co-Entry into the two varieties of supergene lithiophorite through adsorption has been discussed Report of Co in terrestrial Mn-ore has opened up new potential in this part of Orissa.Keywords
Lithiophorite (cobaltian), Manganese Ores, Bonai Keonjhar Belt, Orissa.Full Text
- Geochemistry and Petrogenesis of Pyrophyllite Deposit of Madrangjodi, Keonjhar District, Orissa
Abstract Views :213 |
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Authors
M. Das
1,
S. M. Monalisa
1,
A. K. Paul
1,
R. K. Mishra
1,
J. K. Mohanty
2,
A. A. Pradhan
1,
S. Goswami
3
Affiliations
1 Department of Geology, Utkal University, Bhubaneswar - 751 004, IN
2 Institute of Minerals and Materials Technology, Bhubaneswar - 751 013, IN
3 Department of Geology, Ravenshaw University, Cuttack - 753 003, IN
1 Department of Geology, Utkal University, Bhubaneswar - 751 004, IN
2 Institute of Minerals and Materials Technology, Bhubaneswar - 751 013, IN
3 Department of Geology, Ravenshaw University, Cuttack - 753 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 5 (2012), Pagination: 460-466Abstract
Pyrophyllite deposit at Madrangjodi is a large lensoidal massif overlain unconformably by Dhanjori quartzite and underlain by the parent Singhbhum granite (Phase - II). Pyrophyllite and quartz are the major minerals with minor to trace amounts of muscovite, chloritoid opaques and tourmaline. It is broadly divisible into lamellar, granular and schistose varieties. SiO2 (66.90-74.36 %) and Al2O3 (20.80-27.54 %) are the major oxides. The major elements data indicate its derivation from Singhbhum granite with depletion of SiO2 and increment of Al2O3. Trace and REE data are discussed to corroborate its genesis.Keywords
Pyrophyllite, Hydrothermal Alteration, Madrangjodi, Orissa.References
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