Zircon U-Pb age constraints from Iran on the magmatic evolution related to Neotethyan subduction and Zagros orogeny

摘要: Abstract This study reports zircon LA-ICPMS U–Pb ages of 50 igneous rock samples from the Urumieh–Dokhtar magmatic arc (UDMA) and Sanandaj–Sirjan structural zone (SSZ) in Iran. These results, together with literatures our unpublished age data, better delineate evolution related to Neotethyan subduction subsequent Zagros orogeny that resulted Arabia–Eurasia collision. Subduction-related magmatism was active during Jurassic time, as evidenced by presence widespread I-type granitoids Middle Late (176–144 Ma) SSZ. After a protracted quiescence Early Cretaceous, activity renewed inland UDMA which we identify Cretaceous (81–72 Ma) Jiroft Bazman areas, southeastern segment UDMA. The volcanism most Eocene Oligocene (55–25 Ma), much longer lasting than previously thought just an pulse. Such prolonged “flare-up” event can be correlated Armenia where coeval calc-alkaline rocks are common. ceased progressively northwest southeast, activities ending Miocene (ca. 22 Ma) Meghri, 16 Ma) Kashan 10–6 Ma) Anar, respectively. southeastward cessation is consistent notion oblique diachronous collision between Arabia Eurasia. Post-collisional started ca. 11 Ma Saray, east off Urumieh Lake, which, along later eruptions Sahand (6.5–4.2 Ma) Sabalan (≤ 0.4 Ma) volcanoes, forms compositionally unique component vast volcanic field covering Lesser Caucasus, NW Iran eastern Anatolia regions.