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Singh, P. P.
- 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
- 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.
- 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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