Mineralogy, chemistry and genesis of Nishikhal manganese ores of South Orissa, India

Acharya, B. C.; Rao, D. Sreenivasa; Sahoo, R. K.

doi:10.1007/s001260050074

Cited by 12 publications

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“…Apart from Mn, Al and Li, minor to trace amounts of Fe, Mg, Ca, K, Si, Cu, Ni, Co and Zn are also present in lithiophorite (Roy 1981;Ostwald 1984Ostwald , 1988. Lithiophorite in the Precambrian manganese ore deposits of Orissa has been reported by previous authors (Roy 1981;Acharya et al 1997;Acharya, Nayak 1998;Acharya, Dash 2002;Mohapatra et al 2005 The manganese ores at Nishikhal are associated with khondalite, quartzite and calcsilicate granulite belonging to the Precambrian Eastern Ghats complex. The manganese ores and their host rocks were subjected to granulite facies metamorphism and experienced all of the deformational episodes typical of the Eastern Ghats complex before undergoing supergene enrichmernt (Acharya et al 1997).…”

Section: Introductionmentioning

confidence: 72%

“…It has a high aluminium content comparable with that of lithiophorite from New Caledonia (Llorca, Monchoux 1991). The primary manganese minerals in the Precambrian Eastern Ghats complex contain very small (Co < 1%) contents of cobalt (Acharya et al 1997;Acharya, Nayak 1998;Acharya, Dash 2002). During the supergene processes, lithiophorite formed from the primary manganese oxides and silicates.…”

Section: Discussionmentioning

confidence: 99%

“…The manganese-rich sediments were metamorphosed under granulite facies conditions, affected by granitisation and subsequently underwent supergene enrichment (Acharya et al 1997). Under supergene processes, lithiophorite along with pyrolusite, cryptomelane, romanèchite, birnessite and goethite were formed from the primary manganese minerals of lower valency states such as spessartite, braunite, jacobsite and hausmannite.…”

Section: Discussionmentioning

confidence: 99%

“…The data suggest the preferential linkage of lithium with manganese and aluminium. In the Nishikhal manganese ores, Co, Ni and Zn are positively correlated with MnO 2 (Acharya et al 1997). Acharya et al (1997).…”

Section: Chemical Characteristics Of the Manganese Oresmentioning

confidence: 94%

“…They dominantly contain cryptomelane, romanèchite and pyrolusite with minor amounts of jacobsite, braunite, hausmannite, lithiophorite, birnessite and collophane. The other opaque minerals associated with the ores are goethite, magnetite, hematite, graphite, pyrite, sphalerite, chalcopyrite and the silicate gangue minerals include quartz, orthoclase, garnet (spessartite), apatite, collophane, kaolinite, plagioclase, hyalophane, fibrolite, zircon, biotite and muscovite (Acharya et al , 1997Rao et al 1994Rao et al , 2008.…”

Section: Introductionmentioning

confidence: 99%

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Cobalt-rich lithiophorite from the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India

Rao¹,

Nayak²,

Acharya³

2010

Mineralogia

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Abstract. Fine-grained aggregates of lithiophorite are associated with cryptomelane, romanèchite, birnessite and graphite in the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India. High-cobalt lithiophorite is reported for the first time from the manganese ores. The mode of occurrence and the chemical composition of the lithiophorite are discussed. Along with manganese and aluminium, the lithiophorite contains appreciable quantities of CoO (1.59-8.56%) together with trace amounts of Cu, Ni, Zn, Ti, Ca, Mg, Na, K and P. The Nishikhal lithiophorite is a transition metal-rich lithiophorite.

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Section: Introductionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Chemical Characteristics Of the Manganese Oresmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Cobalt-rich lithiophorite from the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India

Rao¹,

Nayak²,

Acharya³

2010

Mineralogia

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Multivariate analyses and spatial distribution of Manganese minerals in soils close to an abandoned Manganese mine

Ekosse

2009

Land Degrad Dev

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Four hundred soil samples were obtained from a 4 km 2 area close to the abandoned Kgwakgwe Mn oxide ore mine in order to investigate the environmental association of Mn minerals and concentrations in the soils. Manganese minerals and Mn concentrations in samples were identified by X-ray diffractometry and atomic absorption spectrometry, respectively, and results statistically analysed. Bixbyte, Mn 2 O 3 ; braunite, Mn þ2 Mn þ3 6 SiO 12 ; ramsdellite, MnO 2 ; pyrolusite, b-MnO 2 and cryptomelane, K 2 À x Mn 8 O 16 were identified in soil samples at the study site but none of these minerals found in soil samples from the control site. Manganese concentrations in samples from the study area were significantly higher than those from the control site. Statistical data yielded seven clusters with distribution of the Mn minerals and concentrations as follows: cluster 1 dominated by Mn concentrations in soil, cluster 2 by none of the seven Mn minerals, cluster 3 by pyrolusite, cluster 4 by braunite, cluster 5 by cryptomelane, cluster 6 by bixbyite and cluster 7 by ramsdellite. Very weak associations of these minerals were depicted from their correlations. The clusters had a bearing on the spatial distribution of the different minerals. Comparing results obtained from the control site, and geological materials, to the soils from the study area, it is certain that Mn minerals and high Mn concentrations in soils originated from the surrounding geological materials. The mining activities most possibly have affected Mn concentrations' and minerals' occurrences in the soils at the study area.

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Microstructure-compositional Variation in Iron Oxy-hydroxide Minerals formed with Manganese Mineralization, Eastern Ghats Supergroup, Orissa

Mohapatra

Jena

Singh

2011

Journal of the Geological Society of India

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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 % H 2 O, 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.

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Mineralogy, chemistry and genesis of Nishikhal manganese ores of South Orissa, India

Cited by 12 publications

References 0 publications

Cobalt-rich lithiophorite from the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India

Cobalt-rich lithiophorite from the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India

Multivariate analyses and spatial distribution of Manganese minerals in soils close to an abandoned Manganese mine

Microstructure-compositional Variation in Iron Oxy-hydroxide Minerals formed with Manganese Mineralization, Eastern Ghats Supergroup, Orissa

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