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Nayak, Bibhuranjan
- International Conference on "Deep-Sea Minerals and Mining" DSMM-2008
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PDF Views:131
Authors
Affiliations
1 Natl Metallurgical Laboratory, Jamshedpur-831 007, IN
1 Natl Metallurgical Laboratory, Jamshedpur-831 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 6 (2008), Pagination: 895-895Abstract
No Abstract.- Mn-olivine from Gangpur Group of Rocks, Orissa
Abstract Views :189 |
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Authors
Affiliations
1 Regional Research Laboratory, Bhubaneswar - 751 013, IN
2 National Metallurgical Laboratory, Jamshedpur 831 007, IN
1 Regional Research Laboratory, Bhubaneswar - 751 013, IN
2 National Metallurgical Laboratory, Jamshedpur 831 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 5 (2003), Pagination: 581-587Abstract
Mn-olivine (tephroite) bearing assemblage is often recorded m manganese silicate-carbonate-oxide rocks metamorphosed to green schist facies condition in Precambrian Gangpur Group, Orissa Divalent Mn and Fe dominate this assemblage with most phases having high Mn/Fe ratios Minerals in the assemblage include near end member tephroite (TP9{} 33 90 95 Fa4 76 8 40 FO0 55 471), rhodochrosite, pyroxmangite, Jacobsite, spessartine dominated garnet with minor quartz, apatite and barite Tephroite is sometimes altered to either Mn rich minnesotaite or to a sepiohte related mineral that resembles serpentine in Mg-olivine rocks ThIs assemblage is very likely evolved through decarbonation Oxidation processes of a carbonatic precursor under a relatively low oxygen fugacity condition.Keywords
Tephroite, Mn Olivine, Manganese Rich Rocks, Gangpur Group, Orissa.- MN-Olivine from Gangpur Group of Rocks, Orissa
Abstract Views :165 |
PDF Views:142
Authors
Affiliations
1 Geological Survey of India, Marine Wing, DK-6, Salt Lake, Kolkata - 700 091, IN
2 Regional Research Laboratory, Bhubaneswar - 751 013, IN
3 National Metallurgical Laboratory, Jamshedpur - 831 007, IN
1 Geological Survey of India, Marine Wing, DK-6, Salt Lake, Kolkata - 700 091, IN
2 Regional Research Laboratory, Bhubaneswar - 751 013, IN
3 National Metallurgical Laboratory, Jamshedpur - 831 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 62, No 4 (2003), Pagination: 517-518Abstract
No Abstract.- Gold in the Beach Placer Sands of Chavakkad-Ponnani, Kerala Coast, India
Abstract Views :195 |
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Authors
Affiliations
1 Mineral Processing Division, National Metallurgical Laboratory (CSIR), Jamshedpur – 831 007, IN
1 Mineral Processing Division, National Metallurgical Laboratory (CSIR), Jamshedpur – 831 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 4 (2011), Pagination: 345-348Abstract
Although sporadic mining of placer gold from river beds is not uncommon in India, there is no documented literature on the occurrence of gold in the beach placer sand deposits of the country. While characterizing the heavy minerals of the Chavakkad-Ponnani (CP) beach placer sands along the North Kerala coast, the association of gold with the pyriboles in these sands has been observed. A native gold grain of about 25 μm was seen to occur as an inclusion within an amphibole of hornblendic composition. The pyriboles of the CP deposit are angular to sub-angular indicating a nearby provenance that may be in the upstream reaches of the Ponnani River in the districts of Malappuram and Palakkad or further north in the auriferous tracts of the Wynad-Nilambur or Attapadi regions. It is argued that the occurrence of native gold in CP deposit is not a freak occurrence and that it warrants thorough investigation of all the pyribole-ilmenite-rich placers to examine the possible presence of gold and its abundance in the beach placers of northern Kerala coast.Keywords
Beach Sands, Placer Deposits, Gold, Kerala.References
- KRISHNAN, S., VISWANATHAN, G. and BALACHANDRAN, K. (2001) Heavy mineral sand deposits of Kerala. Exploration and Research for Atomic Minerals, v.13, pp.111-146.
- NAKAGAWA, M., SANTOSH, M., NAMBIAR, C.G. and MATSUBARA, C. (2005) Morphology and chemistry of placer gold from Attappadi Valley, southern India. Gondwana Res., v.8, pp.213-222.
- RADHAKRISHNA, B.P. and CURTIS, L.C. (1991) Gold: The Indian Scene. Mineral Resources of India 3, Geological Society of India, pp.19-41.
- SANTOSH, M. and OMANA, P.K. (1991) Very high purity gold from lateritic weathering profiles of Nilambur, southern India. Geology, v.19, pp.746-749.
- SANTOSH, M., PHILIP, R., JACOB, M.K. and OMANA, P.K. (1992) Highly pure placer gold formation in the Nilambur valley, Wynad gold field, southern India. Mineralium Deposita, v.27, pp.336-339.
- Manganilmenite in the Magnetite Ore Body from Pokphur Area of Nagaland, North East India and the Possibility of Microdiamonds in the Ophiolites of Indo-Myanmar Ranges
Abstract Views :214 |
PDF Views:78
Authors
Affiliations
1 Mineral Processing Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831 007, IN
2 Institute for Mineralogy and Economic Geology, RWTH Aachen University, D-52056 Aachen, DE
1 Mineral Processing Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831 007, IN
2 Institute for Mineralogy and Economic Geology, RWTH Aachen University, D-52056 Aachen, DE
Source
Current Science, Vol 112, No 01 (2017), Pagination: 155-160Abstract
Manganilmenite is found to be associated with the magnetite ore body of Pokphur area in the Nagaland ophiolites, North East India. There is perhaps no earlier description of the mineral from the Indian subcontinent. It occurs as an accessory mineral with magnetite and Fe-chlorite (chamosite). Electron probe micro-analytical data reveal that the mineral contains 5.6-8.5 wt% MnO and traces of MgO, ZnO and Cr2O3, while the TiO2 content remains within narrow limits of 50-53 wt%. The calculated pyrophanite end-member varies from 13% to 18%. Although the magnetite body of Pokphur has been reasonably proved to be a hydrothermally altered product of basic and ultrabasic igneous rocks, and most of the minerals in the magnetite body are supergene in nature, different end-member compositions of mangan-ilmenite indicate that it has originally crystallized with the basic suite of rocks and has survived the alteration process with only marginal effects. Since manganilmenite has been considered as a diamond indicator mineral and ophiolites are a newly documented host of microdiamonds elsewhere in the world, the presence of manganilmenite in the Pokphur magnetite hints towards occurrence of microdiamonds in the ophiolite suite of rocks of the Indo-Myanmar ranges.Keywords
Diamond Indicator Mineral, Ophiolite, Magnetite Ore Body, Manganilmenite.- Origin of zoned laurite – a platinum group mineral from the Mesoarchaean Bangur chromite deposit, Boula–Nuasahi ultramafic complex, Odisha, India
Abstract Views :131 |
PDF Views:73
Authors
Affiliations
1 CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India; Academy of Scientific and Innovative Research, Ghaziabad 201 002, India
1 CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India; Academy of Scientific and Innovative Research, Ghaziabad 201 002, India