naa a22 4500 510756298 CHVBK 20180411083123.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s12594-013-0196-2 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0196-2 Tokapal tuff-facies kimberlite, Bastar craton, Central India: A nickel prospect? [Elektronische Daten] [N. Chalapathi Rao, Bernd Lehmann, B. Panwar, Alok Kumar, Datta Mainkar] We report the occurrence of garnierite (a general term referring to Ni-Mg bearing hydrous silicates in laterites) from the crater-facies Tokapal kimberlite of the Bastar craton, Central India. Garnierite occurs as discrete ovoid or amoeboid segregations (up to 200 mm) or as veinlets with up to 18.1 wt% NiO and high iron contents (up to 36.2 wt% FeOT). Chemical composition of the garnierite implies its derivation from a magnesium-rich protolith. Extensive lateritisation of the large crater-facies (∼2.5 km diameter) saucer-shaped kimberlite under tropical weathering conditions, aided by suitable topography, drainage and favourable structural set-up, are the factors inferred to be responsible for the formation of garnierite in the Tokapal system. As lateritic nickel ores constitute significant resources for nickel exploration, the perspective of the Tokapal kimberlite as a nickel prospect needs to be investigated. Geological Society of India, 2013 Nickel nationallicence laterite nationallicence garnierite nationallicence kimberlite nationallicence Tokapal nationallicence Bastar craton nationallicence India nationallicence Chalapathi Rao N. Department of Geology, Centre of Advanced Study, Banaras Hindu University, 221005, Varanasi, India aut Lehmann Bernd Mineral Resources, Technical University of Clausthal, 38678, Clausthal-Zellerfeld, Germany aut Panwar B. Department of Geology, Centre of Advanced Study, Banaras Hindu University, 221005, Varanasi, India aut Kumar Alok Department of Geology, Centre of Advanced Study, Banaras Hindu University, 221005, Varanasi, India aut Mainkar Datta Directorate of Geology and Mining, 492007, Raipur, Chhattisgarh, India aut Journal of the Geological Society of India Springer India 82/6(2013-12-01), 595-600 0016-7622 82:6<595 2013 82 12594 https://doi.org/10.1007/s12594-013-0196-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0196-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chalapathi Rao N. Department of Geology, Centre of Advanced Study, Banaras Hindu University, 221005, Varanasi, India aut NATIONALLICENCE 700 1- Lehmann Bernd Mineral Resources, Technical University of Clausthal, 38678, Clausthal-Zellerfeld, Germany aut NATIONALLICENCE 700 1- Panwar B. Department of Geology, Centre of Advanced Study, Banaras Hindu University, 221005, Varanasi, India aut NATIONALLICENCE 700 1- Kumar Alok Department of Geology, Centre of Advanced Study, Banaras Hindu University, 221005, Varanasi, India aut NATIONALLICENCE 700 1- Mainkar Datta Directorate of Geology and Mining, 492007, Raipur, Chhattisgarh, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer India 82/6(2013-12-01), 595-600 0016-7622 82:6<595 2013 82 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer