Multiple volcanic episodes of the Kermanshah forearc basin, SW Iran: a record of the deactivation and re-initiation of Neotethyan subduction involving a mid-oceanic ridge (original) (raw)
Version 2 2022-08-25, 15:34
Version 1 2022-07-08, 14:26
Posted on 2022-08-25 - 15:34
Abstract: Numerical simulations and theoretical analyses predict that forearc ophiolites likely record subduction cessation and then reinitiation. This paper reports the results of a field study and new geochronological data that enable identification of the Kermanshah forearc basin, SW Iran, which is filled with two terrestrial volcaniclastic successions separated by an Upper Cretaceous reef-facies limestone. Early Late Cretaceous OIBs, early Eocene E/N-MORBs, and late Eocene arc basalts of the basin indicate that Neotethyan subduction ceased during the early Late Cretaceous and then reinitiated during the late Eocene. We suggest that the Neotethyan Ocean between the Iranian and Arabian continents consisted of leading and trailing oceanic plates separated by a mid-oceanic ridge (MOR). Subduction of the leading plate generated the Jurassic to Early Cretaceous Sanandaj–Sirjan arc, which was ended by MOR–trench collision. The Zagros late Early Cretaceous forearc ophiolites represent the youngest/hottest segments of the leading plate emplaced during the MOR–trench collision. Subsequently, subduction of the MOR generated the forearc basin and basalts with diverse geochemistry. After 60 Myr, the cooled trailing plate started to subduct, generating the late Eocene arc basalts. This model bears significant implications for investigating and understanding other fossil subduction zones elsewhere in the world.
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YANG, TIANNAN; CHEN, JIANLIN; HOU, ZENGQIAN; XIN, DI; AGHAZADEH, M. (2022). Multiple volcanic episodes of the Kermanshah forearc basin, SW Iran: a record of the deactivation and re-initiation of Neotethyan subduction involving a mid-oceanic ridge. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.6086586.v2
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