Geochronology and petrogenesis of granitoids and associated mafic enclaves from Ghohroud in the Urumieh–Dokhtar Magmatic Arc (Iran): Evidence for magma mixing during the closure of the Neotethyan Ocean

The Ghohroud granitoids (GG), containing mafic microgranular enclaves (MMEs) are located in the central part of Urumieh-Dokhtar Magmatic Arc (UDMA) Iran. They associated with subduction-related magmatism Alpine-Himalayan orogenic belt. GG comprised a variety intermediate and felsic rocks, including tonalite, granodiorite, granite, diorite porphyry monzodiorite. MMEs gabbroic tonalite composition characterized by fine-grained hypidiomorphic texture occasional chilled margins. show rounded, sharp or irregular contact host granitoids. occurrences quartz, K-feldspar corroded plagioclase indicate that products mixing between mantle crust-derived magmas. New ages zircon U–Pb dating reveal Kashan area emplaced at ca. 19–17 Ma (Burdigalian). All samples granitoid rocks this study metaluminous calc-alkaline I-type affinities. enriched light rare earth elements (LREEs) slight negative Eu anomalies (Eu/Eu* = 0.36–0.95). These features combination relative depletion Nb, Ta, Ti P, closely magmas an active continental margin. yield relatively homogeneous isotopic compositions initial 87Sr/86Sr ratios ranging from 0.706036 to 0.707055, ?Nd(t) values varying ?2.25 0.8, Nd model (TDM) vary limited range 0.70–0.96 Ga. similar (0.706420–0.707366), (?1.32 ?0.27), TDM (0.68–1.09 Ga) Pb granitoids, which imply they attained equilibration during magma mingling mixing. In petrographic, chemical results, we suggest origin their were related interaction melts mantle-derived magma-mixing event possibly occurred transition subduction collision UDMA along closure Neotethyan ocean.