Supra-subduction and mid-ocean ridge peridotites from the Piranshahr area, NW Iran

Hajialioghli, Robab; Moazzen, Mohssen

doi:10.1016/j.jog.2014.06.003

Cited by 18 publications

(12 citation statements)

References 78 publications

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“…Ahadnejad, Valizadeh, Deevsalar, & Rezaei‐Kahkhaei, 2011; Arvin, Pan, Dargahi, Malekizadeh, & Babaei, 2007; Chiu et al, 2013; Shahbazi et al, 2010), as evidenced by well‐exposed late Triassic I‐type plutonic rocks in the southeastern part of the SSZ (Arvin et al, 2007; Hassanzadeh & Wernicke, 2016). Based on isotope geochronological data from major plutonic rocks from northwest part of the SSZ (Table 6) and Neo‐Tethyan oceanic lithosphere of Chaldoran (Rezaei Bargoshadi, Moazzen, & Yang, 2019), Khoy (Ghazi, Pessagno, Hassanipak, Duncan, & Babaie, 2003; Khalatbari Jafari, Juteau, & Cotton, 2006), Serow (Rezaii & Moazzen, 2014), Piranshahr (Hajialioghli & Moazzen, 2014), and Kermanshah (Allahyari, Saccani, Pourmoafi, Beccaluva, & Masoudi, 2010) (Figure 1), collision between Arabian margin and north SSZ initiated in the late Cretaceous (Figure 12). Also, the Amiran formation conglomerates of Maastrichtian–Paleocene age have ophiolite clasts, showing that the emplacement time of these ophiolites is pre‐Maastrichtian (Ajirlu, Moazzen, & Hajialioghli, 2016).…”

Section: Discussionmentioning

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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Section: Discussionmentioning

confidence: 99%

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

2020

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“…Mantle peridotites from this ophiolite indicate both mid-ocean ridge and suprasubduction components (Hajialioghli and Moazzen, 2014).…”

Section: Kermanshah Ophiolitementioning

confidence: 92%

“…The northwest of the Kermanshah Ophiolite was named the Piranshahr Ophiolite by Hajialioghli and Moazzen (2014). Mantle peridotites from this ophiolite indicate both mid-ocean ridge and suprasubduction components (Hajialioghli and Moazzen, 2014).…”

Section: Kermanshah Ophiolitementioning

confidence: 99%

Geodynamic evolution of the Sanandaj-Sirjan Zone, Zagros Orogen, Iran

Ghazi¹,

Moazzen²

2015

Turkish J Earth Sci

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IntroductionThe geology and especially the tectonic style of Iran are highly influenced by the history and evolution of the Tethyan oceans. The Iranian crust is divided into several geotectonic units, namely the Zagros, Makran, Sanandaj-Sirjan Zone, Urmia-Dokhtar Magmatic Assemblage (UDMA), Central Iran block, and Sistan Suture Zone (Figure 1). Each unit is characterized by a relatively unique record of stratigraphy, magmatic activities, metamorphism, orogenic events, tectonics, and overall geological style. The Zagros Orogen is part of the Alpine-Himalayan mountain chain. From the northeast to the southwest, the Zagros Orogen consists of four parallel tectonic zones: (i) the UDMA, (ii) the Sanandaj-Sirjan Zone, (iii) the Zagros Fold Thrust belt, and (iv) the Mesopotamian-Persian gulf foreland basin (

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“…Early to Middle Jurassic intra‐oceanic subduction is reported for Izmir‐Ankara‐Erzincan suture in Turkey (Çelik et al, 2011; Hässig et al, 2013; Parlak et al, 2013; Topuz et al, 2013) connecting to the Sevan‐Akera suture in Armenia (Galoyan et al, 2009; Rolland, Galoyan, Sosson, Melkonyan, & Avagyan, 2010). Most ophiolites along the Zagros belt in Iran (both “inner” and “outer” belts) are SSZ ophiolites (Hajialioghli & Moazzen, 2014; Shafaii Moghadam & Stern, 2015). Ophiolites in the Sabzevar area at the northern margin of the Iranian micro‐continent are SSZ type and mafic rocks of this ophiolite represent the possible initial basement of an island arc (Omrani, Moazzen, & Oberhänsli, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Most ophiolites along the Zagros belt in Iran (both "inner" and "outer" belts) are SSZ ophiolites (Hajialioghli & Moazzen, 2014;Shafaii Moghadam & Stern, 2015). Ophiolites in the Sabzevar area at the northern margin of the Iranian micro-continent are SSZ type and mafic rocks of this ophiolite represent the possible initial basement of an island arc (Omrani, Moazzen, & Oberhänsli, 2018).…”

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confidence: 99%

Early Cretaceous (Albian) intra‐oceanic subduction in northern branch of Neotethys in NW Iran: Zircon U–Pb geochronology and geochemistry of ophiolitic metagabbros from the Chaldoran area

2020

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The Chaldoran ophiolite in NW Iran and at the Turkish border is a part of the larger Khoy ophiolite. Serpentinized peridotites, pillow basalt, cumulate and isotropic gabbro, pelagic limestone, and radiolarite along with volcano‐sedimentary units are the main rock types in the area. These rocks are mixed together in some places as tectonic and “coloured” mélanges. The gabbro consituent of this ophiolite is either fresh or is metamorphosed up to upper greenschist facies. These meta‐basic rocks contain relatively large crystals of plagioclase and clinopyroxene, partially changed to amphibole. Metamorphic epidote is formed in some samples. Whole‐rock chemistry of these rocks shows a basaltic magmatic composition. Low SiO2 contents along with relatively high MgO and FeOtotal contents testify for a mantle source for the parental magma of the studied samples, intermediate between tholeiitic and calc‐alkaline series. LREE and HFSE are slightly depleted and LILE show enrichment in the studied samples and Ta, Nb, Ti show negative anomalies with respect to MORBs. All chemical features are compatible with a supra‐subduction zone setting for the rocks. The studied rocks are similar to primitive arc and less evolved rocks, geochemically. Also the samples show both MORB‐like magmas, formed at the initial stage of a subduction and IAT chemical features. U–Pb dating of zircons on the gabbro sample gave 107.5 ± 1.3 Ma (Albian) crystallization age. The metabasites from the Chaldoran ophiolite are similar to intra‐oceanic ophiolite‐related igneous rocks from the Zagros suture zone in Iran and NE Iraq and equivalent rocks from the Neotethyan sutures in east Turkey and Armenia and basic rocks from the Late Cretaceous ophiolites of the outer Zagros and Taurus, which are related to the subduction initiation (SI) stage.

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Supra-subduction and mid-ocean ridge peridotites from the Piranshahr area, NW Iran

Cited by 18 publications

References 78 publications

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

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

Geodynamic evolution of the Sanandaj-Sirjan Zone, Zagros Orogen, Iran

Early Cretaceous (Albian) intra‐oceanic subduction in northern branch of Neotethys in NW Iran: Zircon U–Pb geochronology and geochemistry of ophiolitic metagabbros from the Chaldoran area

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