U-Pb zircon ages, field geology and geochemistry of the Kermanshah ophiolite (Iran): From continental rifting at 79 Ma to oceanic core complex at ca. 36 Ma in the southern Neo-Tethys

The geodynamic evolution of the Zagros Mountains of Iran remains obscure. In particular, the time of formation of the Zagros ophiolites and the closure of the Neo-Tethys Ocean are highly controversial. Here we present new precise zircon U-Pb ages that show that the younger part (Sahneh-Kamyaran) of the Kermanshah ophiolite formed at 35.7 +/- 0.5 Ma and the older part (Harsin) at 793 +/- 0.9 Ma. Field relations and geochemical evidence show that the younger Sahneh-Kamyaran part is probably a fossil oceanic core complex, and the older Sahneh part is probably a continental-oceanic transition complex. Both the Sahneh-Kamyaran and Sahneh parts were later emplaced into an accretionary complex. We conclude and infer that the final closure time of the southern Neo-Tethys Ocean was after the Late Eocene. Our data and tectonic model have crucial implications for the geodynamic evolution of the Zagros region. (C) 2015 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.