• Geochemistry of the Precambrian mafic dykes in and around the Western Ghats greenstone belt, Western Dharwar Craton

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    • Keywords


      Dykes; Kudremukh; Dharwar; petrogenesis; MELTS.

    • Abstract


      The preliminary field, petrographic and whole-rock geochemical data of the mafic dykes in and around the Western Ghats belt (WGB), Western Dharwar Craton (WDC) is presented in this study. The NNW–SSE trending tholeiitic mafic dykes are basalt to basaltic-andesite in composition. The studied dykes are generally LREE enriched and exhibit negative Nb–Ta and Ti anomalies indicating crustal contamination. Petrological modelling shows that the chemical variability of the dykes is primarily due to crystal fractionation and crustal contamination. Rare earth element (REE) modelling suggests that the WGB dykes were likely derived by low-degree partial melting (${\sim}$3.5%) of a garnet-spinel bearing mantle source. The close similarity in the Beld, petrography and geochemical characteristics between the studied dykes and the 2.21 Ga mafic dykes of WDC suggests that the WGB dykes may represent the 2.21-Ga mafic event in the WDC.

    • Author Affiliations



      1. Ore Research and Exploration Group (ORE-G), Department of Geology, Central University of Kerala, Kasaragod, Kerala 671 320, India.
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  • Journal of Earth System Science | News

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