The age of the NW-SE trending boninitic dykes in the Bhanupratappur area, central Bastar Craton, is 2365.6 ± 0.9 Ma. The chemical variability of the boninitic dykes is generated by fractional crystallization of orthopyroxene, feldspar and clinopyroxene. The Bhanupratappur dykes were also affected by crustal contamination. Trace element ratios, εNd(t) values (–2.4 to +4.5) of the Bhanupratappur dyke indicate that some dykes were contaminated by continental crust whereas the chondritic Nd isotopes (εNd(t) = –0.7 to +0.6) of the Karimnagar dykes shows less evidence of contamination but inherited zircons indicate the possibility of contamination. Modeling indicates that ~10% of crustal contamination can generate the maximum Sr isotopic variability of the Bhanupratappur dykes. The trace element modeling suggests the primary melts may be derived from a pyroxenitic mantle source near spinel-garnet transition zone. The Bhanupratappur dykes in the Bastar Craton are correlative to the similar aged boninitic dykes in the Dharwar Craton and together form a giant radiating dyke swarm. Furthermore, the dykes indicate that the Dharwar and Bastar Craton were adjacent during 2.37 Ga and that the incoherence of the dyke orientations may due to their different relative positions then present. Combined with previous paleomagnetic results indicate that Dharwar Craton, Yilgarn Craton (Australia), Zimbabwe craton (Africa) and Kola–Karelia craton (Southeast Finland and Karelia Russia) were proximal during Early Paleoproterozoic (2.37 Ga).
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