Geochemistry and new zircon U–Pb geochronology of Mesoproterozoic Punugodu granite pluton, SE India: implications for anorogenic magmatism along the western margin of Nellore Schist Belt, India

Abstract We report a new zircon U–Pb age of 1257 ± 6 Ma for the Punugodu granite (PG) pluton in Eastern Dharwar Craton (EDC), Southern India. The Mesoproterozoic PG is alkali feldspar hypersolvus emplaced at shallow crustal level, as evident from presence rhyodacite xenoliths and hornfelsic texture developed metavolcanic country rocks Neoarchaean Nellore Schist Belt (NSB). Geochemically, metaluminous, ferroan alkali-calcic, characterized by high SiO 2 Na O + K O, Ga/Al ratios >2.6, high-field-strength elements rare earth element (REE) contents with low CaO, MgO Sr, indicating its similarity to anorogenic, (A-type) granite. highly fractionated REE patterns negative europium anomalies reflect evolved nature fractionation. Mafic (MME) hybrid (HME) microgranular enclaves represent distinct batches mantle-derived magmas that interacted, mingled undercooled within partly crystalline host magma. Felsic (FME) having similar mineralogical geochemical characteristics most likely fragments marginal rock facies pluton. appears be formed an oceanic island basalt (OIB)-like source within-plate setting. emplacement ( c. Ma) vicinity Kanigiri Ophiolite 1334 shows gap nearly 77 Ma, which probably suggests extensional environment along terrain boundary western margin NSB EDC.