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The Sm-Nd, Rb-Sr and Pb-Pb isotopic systematics of whole rock and separated mineral fractions from four tholeiitic mafic dykes of the Mahbubnagar swarm have been investigated. This dyke swarm intrudes the granitic basement of the Cuddapah basin in the Eastern Dharwar Craton (EDC). The Sm-Nd data on whole rock samples of four gabbros and one dolerite and 15 mineral fractions yielded a linear array...