Contrasting Isotopic Mantle Sources for Proterozoic Lamproites and Kimberlites from the Cuddapah Basin and Eastern Dharwar Craton: Implication for Proterozoic Mantle Heterogeneity Beneath Southern India

Abstract Kimberlites intruding the Precambrian basement towards the western margin of the Cuddapah basin near Anantapur (1090 Ma) and Mahbubnagar (1360 Ma) in Andhra Pradesh have initial 87Sr/86Sr between 0.70205 to 0.70734 and eNd between +0.5 to +4.68. Mesoproterozoic lamproites (1380 Ma) from the Cuddapah basin (Chelima and Zangamarajupalle) and its NE margin (Ramannapeta) have initiail 87Sr/86Sr between 0.70520 and 0.7390 and eNd from -6.43 …