99652 artpubuab driver oai:ddd.uab.cat:99652 doi 10.1344/105.000001759 articleid 16965728v10n3p283 eng Mishra, M. Indira Gandhi National Open University. Presently at School of Sciences Provenance, tectonic setting and source-area weathering of Mesoproterozoic Kaimur Group, Vindhyan Supergroup, Central India The siliciclastic of the Upper Kaimur Group of the Vindhyan Supergroup in Central India have been geochemically studied in order to understand their provenance, paleoweathering conditions and tectonic conditions. A-CN-K (Al2O3-CaO-K2O) ternary diagram and chemical index of alteration (CIA) values suggest that the granitic source rocks underwent moderate to high degree of chemical weathering under moderate weathering conditions for an extended period of time, or under humid weathering for shorter periods of time. Similar CIA values in all textural types indicate that recycling processes homogenized the shale and sandstone compositions. Various geochemical discriminants and elemental ratios such as K2O/Na2O, Al2O3/TiO2, SiO2/MgO, La/Sc, Th/Sc, Zr/Sc, Th/Cr, [Gd/ Yb]N and pronounced negative Eu anomalies indicate the rocks to be the product of post-Archean, Proterozoic granitic source, with minor granodioritic input and substantial sediment recycling. The geochemical signatures corroborate their deposition in a subsiding foreland basin over Bundelkhand craton with provenance from south, south westerly Chotanagpur granite gneiss. Tots els drets reservats http://www.europeana.eu/rights/rr-f/ Anglès Article de fons Kaimur Group Vindhyan Supergroup Siliciclastic Geochemistry Proterozoic granite Foreland basin info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Sen, S. Banaras Hindu University. Department of Geology Vol. 10, Núm. 3 (setembre 2012), p. 283-293 Geologica acta 1696-5728 13 1069957 http://ddd.uab.cat/pub/geoact/geoact_a2012m9v10n3/geoact_a2012m9v10n3p283.pdf 0283 293 setembre 3 10 geoact_a2012m9v10n3 2012 ARTPUB UAB GEOACT file 0 MD5 57ec94e75bceb05eed189ad5f22cfb26 1069957 bytestream 1.6 filepath pub/geoact/geoact_a2012m9v10n3/geoact_a2012m9v10n3p283.pdf disk