SmNd, PbPb and RbSr geochronology and petrogenesis of the mafic dyke swarm of Mahbubnagar, South India: implications for Paleoproterozoic crustal evolution of the Eastern Dharwar Craton

Palaeoproterozoic (∼1.9Ga) extension and breakup along the eastern margin of the Eastern Dharwar Craton, SE India: New Sm–Nd isochron age constraints from anorogenic mafic magmatism in the Neoarchean Nellore greenstone belt

“…Location of the Nellore greenstone (sensu stricto) belt (metabasalt-metadacite-banded magnetite chert formation sequence -gray; the stippled outline enclosing a larger area includes parts of the Vinjamur (V) and Udaygiri (U) domains, marked as (v) in the Eastern Dharwar Craton along with the other $2.7 Ga greenstone belts. The dyke swarm in the craton includes dykes with ages between 1899 and 1600 Ma (e.g., Subba Rao and Radhakrishna Murthy, 1985;Murthy, 1995;Radhakrishna et al, 1999) and older metamorphosed quartz tholeiite dyke swarm with ages between 2.17 and 2.45 Ga (Pandey et al, 1997;Zachariah et al, 1995;Halls et al, 2007) and the Cuddapah basin. PAP-Prakasam Alkaline Province intrusions.…”

New 1.9-2.0 Ga, Pb-Pb (PbSL), Age of Dolomites from Vempalle Formation, Lower Cuddapah Supergroup, Eastern Dharwar Craton, India

“…Uranium mineralisation in impure dolomite of Vempalle Formation is statabound and syn-diagenetic (Rai, 2012 (Murthy et al, 1987 andPandey et al, 1997), which was responsible for its development and later deposition of Cuddapah Supergroup of rocks took place, most probably, between c. 2000-1400 Ma.…”

Carbonate xenoliths hosted by the Mesoproterozoic Siddanpalli Kimberlite Cluster (Eastern Dharwar craton): implications for the geodynamic evolution of southern India and its diamond and uranium metallogenesis

“…This terrane is also characterized by the presence of extensive mafic dyke swarms (gabbro, dolerite and pyroxenite), a few of which have been dated at *2.1 Ga (e.g., Pandey et al 1997). The Siddanpalli kimberlites (*1,090 Ma) constitute the youngest, as well as the deepest, mantle-derived igneous rocks in this interbasinal area.…”

“…2). Meta-basalts, amphibolite, quartz-sericite schist, banded-iron formations, boninitic rocks of the Gadwal greenstone (schist) belt, and mafic dyke swarms constitute the main lithologies in the area (e.g., Pandey et al 1997). One of the Siddanpalli kimberlites, dated at 1,093 ± 4 Ma (Anil Kumar et al 2007), constitute the youngest known intrusive rocks in this area.…”