The age and geochemistry of the bardkish syenite, northwest iran: Syenite formation during neo-tethyan subduction

Amin Jafari, Mohsen Moayyed*, Ian S. Williams

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    SHRIMP U–Pb dating of zircon from two representative samples of the Bardkish sye-nitic pluton, Urumieh plutonic complex, northwestern Iran, yielded a Late Cretaceous weighted mean206Pb/238U age of 91.1 ±0.8 Ma (Turonian). The pluton is character-ized by high K2O content, Ti–Nb–Ta depletion, enrichment in light rare earth elements and large ion lithophile elements compared to high field strength element, Mg-rich biotite and calcic amphibole, suggesting a shoshonitic affinity. Geochemical features of the Bardkish syenite are consistent with derivation by fractional crystallization of initial mafic parent magmas. It is most likely that primary magma of the sye-nite originated from a metasomatized subcontinental lithospheric mantle source with minor crustal component, and underwent a fractional crystallization process during its emplacement. The estimates of trapping pressures and temperatures suggest that crystallization began at the middle crustal level (less than 11 km) near 700–730°C. The generation of the Bardkish syenite could be related to the subduction of Neo-Tethyan oceanic crust beneath the Central Iranian microcontinent and it possibly marks a major magmatic episode prior to the final closure of the Neo-Tethyan ocean in northwest Iran.

    Original languageEnglish
    Article numbere12375
    Pages (from-to)1-21
    Number of pages21
    JournalIsland Arc
    Volume29
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2020

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