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Mohapatra, B. K.
- 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
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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
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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
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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.
- Morpho-Chemistry of Some Ferromanganese Samples from Central Indian Ocean Basin
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Authors
Affiliations
1 Regional Research Laboratory, Bhubaneswar 751013, IN
1 Regional Research Laboratory, Bhubaneswar 751013, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 35, No 2 (1990), Pagination: 183-188Abstract
This note is aimed at elucidating the relationship between morphology and chemistry of some ferromanganese samples of Central Indian Ocean basin and describing precisely the factors controlling these variations. The samples investigated were dredged from Central Indian Ocean basin at a depth of 4000-5000 m during cruises of SS Fernela (St. F4 and F5), SS Scandy Surveyor (St. SS4, SS5, SS6 and SS8) and RV Sagarkanya (St. SK8) conducted by the National Institute of Oceanography, Goa. Because of certain restrictions, location of sample details have not been mentioned.Keywords
Marine Geology, Ferromanganese Nodules, Indian Ocean.- Vernadite in Goriajbor Manganese Ores, Gangpur Group, India
Abstract Views :196 |
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Authors
Affiliations
1 Minera10gy and Meta110graphy Division, Regional Research Laboratory, Bhubaneswar - 751 013, IN
1 Minera10gy and Meta110graphy Division, Regional Research Laboratory, Bhubaneswar - 751 013, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 49, No 3 (1997), Pagination: 331-336Abstract
Characteristics of vernadite in manganese ores from Gangpur Group of rocks, Goriajhor Formation, Sundargarh district, Orissa, have been described. This terrestrial vernadite is distinguished from δ-MnO2 in marine manganese nodules by its well ordered crystallinity and thinner fibrils of submicron size. It appears to be chemically homogenous with the proposed formula: (Ba, K, Fe) MnO2.nH2O. This vernadite probably originated through solution, precipitation and redeposition under supergene conditions and later transformed into cryptomelane or romanechite.Full Text
- Distribution of Trace Elements in Coal-Lithotypes from Talcher Coalfield, Orissa
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Authors
Affiliations
1 Regional Research Laboratory, Bhubaneswar - 75 1 013, IN
1 Regional Research Laboratory, Bhubaneswar - 75 1 013, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 4 (2006), Pagination: 675-684Abstract
Trace element distribution in bulk coal and lithotypes viz. durain, fusain, clarain and vitrain in two coal seams of two geological formations of Karharbari and Barakar from Talcher coalfield, Orissa is reported and compared with world coal trace element data. Karharbari coal (seam I) contains higher concentrations of As, Ba, Ce, Cr, Th, U and W than Barakar coal (seam II). On the contrary, coal from seam II has high concentrations of Be, Eu, Hf, Mo, Sb, Sc, Sm, and Zn. In both the formations, durain and clarain contain maximum trace elements including REE in appreciable concentration where as vitrain shows least trace constituents. Positive correlation of ash with Ba, Cs, La, Hf, Th, Rb and Sc indicates inorganic affinity of these trace elements. However Sb, As, Cr and Co show negative relation with ash explaining their organic affinilty.Keywords
Trace Elements in Coal, Barakar, Karharbari, Talcher Coalfield, Orissa.- Co-Rich Lithiophorite in Manganese Ores of the Bonai-Keonjhar Belt, Orissa
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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
- Morpho-Chemistry of Hematite in Manganese-Rich formation of Gangpur Group, Orissa
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Authors
Affiliations
1 National Metallurgical Laboratory, Jamshedpur - 83 1 007, IN
2 Regional Research Laboratory, Bhuhaneswar - 751 013, IN
1 National Metallurgical Laboratory, Jamshedpur - 83 1 007, IN
2 Regional Research Laboratory, Bhuhaneswar - 751 013, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 4 (2005), Pagination: 486-490Abstract
The Precambrian manganese-Rich formation (Goriajhar Formation) Gangpur Group contains appreciable Fe, as reflected from the occurrence of hematite in different paragenesis. The first generation of hematite (Hm1) exhibits dissimilar micromorphology, contains Mn in solid solution (MnO: 1 to <4%)and may be termed as Manganoan-Hematite. The different morphological types (Hm1) recorded are: hexagonal plate, twinned idiomorph, suhhedral inclusion within quartz and braunite, blebs forming zone within spessartine garnet, crystal dusted with oriented intergrown ilmenite, haphazard platelets within Mn-aegirine, oriented grains forming alternate bands and fused grainns forming large porphyroblast. The hematite formed due to maartitisation is of second generation (Hm2) and the one that occurs as vein fillings, often traversing the other two types, is of third generation (Hm3). Both Hm2 and Hm3 are devoid of Mn content. The first generation hematite is of primary type. syngenetic with manganese minerals and developed at different stages of metamorphism. The hematite of other two generations is of hypogene origin, Hm2 being formed due to low-temperature oxidation, while Hm3 during solution and reprecipitation at meteoric condition.Keywords
Hematite, Manganoan Hematite, Manganese Rich Formation, Manganese Ore, Gangpur Group, Orissa.- Microstructure-Compositional Variation in Iron Oxy-Hydroxide Minerals Formed with Manganese Mineralization, Eastern Ghats Supergroup, Orissa
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Authors
Affiliations
1 Institute of Minerals and Materials Technology, Bhubaneswar, IN
2 Geology Department, Utkal University, Bhubaneswar, IN
1 Institute of Minerals and Materials Technology, Bhubaneswar, IN
2 Geology Department, Utkal University, Bhubaneswar, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 5 (2011), Pagination: 450-458Abstract
Large volume of iron oxy-hydroxide minerals occur in association with manganese oxide phase in manganese ores of the Eastern Ghats Supergroup, Koraput district, Orissa. On the basis of OH content, the iron mineral can be classified into hydrohematite, goethite, and hydrogoethite. These minerals exhibit eight types of microstructures such as ooloidal, caterpillar, disseminated, reniform, worm, mosaic, globular and spherulitic. Chemical composition of such micro-structures obtained through EPMA, distinguishes them into three domains, developed under different environment. Hydrohematite, having 8-10 % H2O, characteristically contains higher pc of manganese (>5%) and phosphorous (>0.6%) but have low silica and alumina. These are formed syngenetically with Mn-oxide minerals in a manganese rich paragenesis. Goethite containing 11 to 12% water, has relatively low level of manganese and phosphorous, and formed in a later period, as secondary open space filling. Hydrogoethite shows very high water content (>16%), almost devoid of manganese, and impoverished in phosphorous but having higher percentage of alumina, silica and appreciable copper and nickel. This was latest to form in the zone of oxidation under supergene condition.Keywords
Microstructures, Hydroxide Minerals, Manganese, Eastern Ghats, Orissa.- Characteristics of Manganite (γ-MnOOH) in Manganese-Rich Gangpur Group of Rocks, Orissa
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Authors
Affiliations
1 Mineralogy and Metallography Division, Regional Research Laboratory, Bhubaneswar - 751 013, IN
1 Mineralogy and Metallography Division, Regional Research Laboratory, Bhubaneswar - 751 013, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 4 (1998), Pagination: 509-516Abstract
Manganite γ-MnOOH, in the manganese-rich rocks of Precambrian Gangpur Group, Sundargarh district, Orissa, shows dissimilar fabrics and belongs to three generations but has more or less similar chemical composition. It occurs as patchy inclusions, accicular crystallites, egg-shaped micro-nodules, medium to coarse-grained mosaics, vein and fissure fillings and as wedge-shaped linings. The manganite is either formed froin Mn-oxide (jacobsite and vredenburgite) phases through retrogressive metamorphic transformation (Ma1) or generated through pseudomorphic replacement of Mn-sillicate (rhodonite and tcphroite) or Mn-carbonate (rhodochrosite) by chemical weathering under supergene conditions (Ma2). The vein filling type is the latest in its paragenesis (Ma3). Despite different mineral lineages, manganites are chemically similar though crystallites located in veins and fissures are relatively pure.Keywords
Economic Geology, Manganite, Manganese, Gangpur Group, Orissa.- Biogenic Wad in Iron Ore Group of Rocks of Bonai-Keonjhar Belt, Orissa
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Authors
Affiliations
1 Institute of Minerals and Materials Technology, Bhubaneswar, IN
2 Orissa Mining Corporation, Bhubaneswar, IN
3 Department of Geology, Utkal University, Bhubaneswar, IN
1 Institute of Minerals and Materials Technology, Bhubaneswar, IN
2 Orissa Mining Corporation, Bhubaneswar, IN
3 Department of Geology, Utkal University, Bhubaneswar, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 1 (2012), Pagination: 89-95Abstract
Outcrop of wad, about 3-5 m thick, associated with low to medium-grade manganese ore deposits in Iron Ore Group (IOG), is present in large quantum in Bonai-Keonjhar belt, Orissa. It is often inter-bedded with volcanic ash layers. Wad is powdery, fine grained, black to blackish-brown in colour, very soft, readily soils the fingers and its hardness on the Mohs' hardness scale is 1-3. The wad zone is capped by a thin lateritic zone and overlies manganese ore beds of variable thickness in Dalki, Guruda and Dubna mines. Wad constitutes two mineral phases, viz. manganese oxides (δ-MnO2, manganite, romanechite with minor pyrolusite) and iron oxides (goethite/limonite and hematite) with minor clay and free quartz. Mixed limonite-clay and cryptomelane-limonite are commonly observed. Under microscope the ore appears oolitic, pisolitic, elipsoidal to globular in shape having small detritus of quartz, pyrolusite/romanechite and hematite at the core. The ore contains around 23% Mn and 28% Fe with ∼7% of combined alumina and silica. Wad might have developed in a swampy region due to slow chemical precipitation of Fe-Mn-Co enriched fluid, nucleating over quartz/hematite grains. Influence of a marine environment is indicated from δ-MnO2 phase. Remnants of some microfossils, like algal filament, bacteria, foraminifera and diatomite are observed in wad sample under SEM. These microorganisms might have been responsible for the oxidation of dissolved Mn2+ and Fe2+ precipitates. These findings suggest biochemogenic origin of wad in Bonai-Keonjhar belt of Orissa.Keywords
Ferromanganese Oxide, Microbial Formation, Iron Ore Group, Orissa.References
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