Tectonic setting and source of the NWâ€“SE trending mafic dykes from the Tikamgarh area, Bundelkhand craton

Keywords: In this study we present the geochemical analysis of distinct NWâ€“SE trending mafic dykes from Tikamgarh area Bundelkhand craton. These dykes have not been studied previously and highlight the importance of igneous and tectonic processes in the Tikamgarh area Bundelkhand craton. These dykes are characterised as basaltic nature (SiO2 = 48.8â€“50.0 wt.%; Mg# = 44.10â€“61.2) and comparable with MORB type tholeiitic magma series. The LREE is enriched and the HREE is almost flat in Tikamgarh samples with LaN/SmN ratios (1.3-1.6) and SmN/LuN ratios (0.8-1.5) which likely suggests that they originated from distinct mantle melts. The TiO2/Yb vs. Nb/Yb plot reveals the melting depth at which variations reflect spinel residue source which has a shallower melting temperature with spinel. The dyke magmas inherited variably enriched compositions as a result of interaction of upwelling mantle melts with metasomatised subcontinental lithospheric mantle.

Abstract:
In this study, we present the geochemical analysis of distinct NWâ€“SE trending mafic dykes from Tikamgarh area, Bundelkhand craton. These dykes have not been studied previously and highlight the importance of igneous and tectonic processes in the Tikamgarh area, Bundelkhand craton. These dykes are characterised as basaltic nature (SiO2 = 48.8â€“50.0 wt.%; Mg# = 44.10â€“61.2), and comparable with MORB type tholeiitic magma series. The LREE is enriched, and the HREE is almost flat in Tikamgarh samples, with LaN/SmN ratios (1.3-1.6), and SmN/LuN ratios (0.8-1.5), which likely suggests that they originated from distinct mantle melts. The TiO2/Yb vs. Nb/Yb plot reveals the melting depth at which variations reflect spinel residue source, which has a shallower melting temperature with spinel. The dyke magmas inherited variably enriched compositions as a result of interaction of upwelling mantle melts with metasomatised subcontinental lithospheric mantle.

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