naa a22 4500 510756670 CHVBK 20180411083125.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1007/s12594-013-0179-3 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0179-3 Petrochemistry of crater facies Tokapal kimberlite pipe, Bastar craton, central India and its orangeitic affinities [Elektronische Daten] [P. Dhote, Ashish Dongre, D. Subbarao] Tokapal kimberlite is the only well preserved crater facies kimberlite intruded within sedimentary sequence of Indravati basin in Bastar craton of central India. We present detailed petrographical and whole rock geochemical studies, carried out on ten samples collected from different locations from Tokapal kimberlite to constrain its genesis and also the mantle processes involved in the origin of this earlier characterized Group I kimberlite. Geochemical studies show that only SiO2 content and the mobile trace elements Ba, Sr, and K vary in the crater facies while rest others show restricted range and can be successfully used in evaluating the petrogenetic processes. Very low abundances of Rb (<2 ppm), Sr (<28 ppm), Ba (<52 ppm) and Cs (0.02-3 ppm) are observed which show possible effects of late-stage alteration rather than significant crustal contamination. The LREE enriched REE pattern, absence of positive Eu anomalies and HREE depletion also provide further additional evidence against crustal contamination considerably modifying magma composition. We infer the presence of less enriched (metasomatised) mantle source regions and comparatively greater degrees of partial melting responsible for the genesis of Tokapal kimberlite. Present study also suggests that crater facies Tokapal kimberlite intruding the Indravati basin, Bastar craton has a Group II kimberlite (orangeite) affinity. This finding is important in light of recent identification of Mainpur kimberlites of Bastar craton as orangeites. Geological Society of India, 2013 Kimberlite nationallicence Group II kimberlite nationallicence Geochemistry nationallicence Petrogenesis nationallicence Bastar craton nationallicence Dhote P. Geological Survey of India, 382 043, Gandhinagar, India aut Dongre Ashish Post Graduate Department of Geology, Institute of Science, 431 004, Aurangabad, India aut Subbarao D. CSIR-National Geophysical Research Institute, 500 606, Hyderabad, India aut Journal of the Geological Society of India Springer India 82/5(2013-11-01), 485-494 0016-7622 82:5<485 2013 82 12594 https://doi.org/10.1007/s12594-013-0179-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0179-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dhote P. Geological Survey of India, 382 043, Gandhinagar, India aut NATIONALLICENCE 700 1- Dongre Ashish Post Graduate Department of Geology, Institute of Science, 431 004, Aurangabad, India aut NATIONALLICENCE 700 1- Subbarao D. CSIR-National Geophysical Research Institute, 500 606, Hyderabad, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer India 82/5(2013-11-01), 485-494 0016-7622 82:5<485 2013 82 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer