Geochemistry, petrology and geodynamic setting of the Urumieh plutonic complex, Sanandaj–Sirjan zone, NW Iran: New implication for Arabian and Central Iranian plate collision

Jafari, Amin; Fazlnia, Abdolnaser; Jamei, Susan

doi:10.1016/j.jafrearsci.2017.11.039

Cited by 17 publications

(1 citation statement)

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“…Syenitic rocks are a minor component of the igneous suite. Most of these are located in the northwest of the SSZ, in places such as Urumieh (Jafari, Fazlnia, & Jamei, 2018), Piranshahr (Mazhari et al, 2009), Sardasht (Fazlnia, 2018), Saqqez (Sepahi & Athari, 2006), Almogholagh (Amiri et al, 2017; Jamshidi‐Badr, Collins, Salomao, & Costa, 2018), Golpaygan (Davoudian, Hamedani, Shabanian, & Mackizadeh, 2007), and Dehgolan (Sarjoughian, Kananian, Haschke, & Ahmadian, 2015). Most of them have been assumed to have formed mainly in an extensional tectonic setting because of their A‐type nature and or occurring in association with A‐type granitoids (Amiri et al, 2017; Davoudian et al, 2007; Mazhari et al, 2009; Sarjoughian et al, 2015; Sepahi & Athari, 2006).…”

Section: Introductionmentioning

confidence: 99%

The age and geochemistry of the Bardkish syenite, northwest Iran: Syenite formation during Neo‐Tethyan subduction

2020

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SHRIMP U-Pb dating of zircon from two representative samples of the Bardkish syenitic pluton, Urumieh plutonic complex, northwestern Iran, yielded a Late Cretaceous weighted mean 206 Pb/ 238 U age of 91.1 ±0.8 Ma (Turonian). The pluton is characterized by high K 2 O 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 syenite 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.

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