Peridotites from the Khoy Ophiolitic Complex, NW Iran: Evidence of mantle dynamics in a supra-subduction-zone context

Monsef, Iman; Rahgoshay, Mohammad; Mohajjel, Mohammad; Moghadam, Hadi Shafaii

doi:10.1016/j.jseaes.2009.10.007

Cited by 26 publications

(11 citation statements)

References 77 publications

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“…We consider that the Western and Eastern Khoy ophiolites were probably formed in different tectonic settings (Figure ) at different ages (Figure ). We also suggest that MORB‐like melts interacted with mantle sequences of the Eastern Khoy ophiolite, probably in a back‐arc basin setting (Figure b,c) (as suggested also by Monsef et al, ), and as a result, high‐Al chromitites precipitated (cf. Arai & Miura, ).…”

Section: Discussionsupporting

confidence: 83%

“…Previous studies on the Khoy ophiolite complex have focused mostly on its structural and tectonic associations (Azizi, Moinevaziri, Mohajjel, & Yagobpoor, ; Monsef, Rahgoshay, Mohajjel, & Moghadam, ), the geochemistry of intrusive and extrusive rocks (Khalatbari‐Jafari, Juteau, & Cotton, ), and radiogenic ages of metamorphic rocks (Azizi, Chung, Tanaka, & Asahara, ) and igneous rocks (Ghazi et al, ; Khalatbari‐Jafari, Juteau, Bellon, & Emami, ). Only a few papers refer to the chromitite deposits in the Khoy ophiolite and do basic studies on the geochemistry and textures of the Khoy chromitite (Azimzadeh et al, ; Malekghasemi, & Karimzadeh‐Somarin, ).…”

Section: Introductionmentioning

confidence: 99%

“…Only a few papers refer to the chromitite deposits in the Khoy ophiolite and do basic studies on the geochemistry and textures of the Khoy chromitite (Azimzadeh et al, 2011;Malekghasemi, & Karimzadeh-Somarin, 2005). These previous studies report the high concentrations of chromite grains in peridotites (Khalatbari-Jafari et al, 2004;Monsef et al, 2010) and indicate the existence of high-Cr (Malekghasemi, & Karimzadeh-Somarin, 2005) and high-Al chromitites (Azimzadeh et al, 2011). In this study, we discuss comprehensive mineralogical and geochemical data of chromitites from both the Western and Eastern Khoy ophiolites.…”

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confidence: 99%

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Mineral chemistry and petrogenesis of chromitites from theKhoy ophiolite complex,NorthwesternIran:Implications for aggregation of two ophiolites

et al. 2017

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The Khoy ophiolitic complex in Northwestern Iran is a part of the Tethyan ophiolite belt, and is divided into two sections: the Eastern ophiolite in Qeshlaq and Kalavanes (Jurassic–Cretaceous) and the Western ophiolite in Barajouk, Chuchak and Hessar (Late Cretaceous). Our chromitites can be clearly classified into two groups: high‐Al chromitites (Cr# = 0.38–0.44) from the Eastern ophiolite, and high‐Cr chromitites (Cr# = 0.54–0.72) from the Western ophiolite. The chromian spinels in high‐Al chromitite include primary mineral inclusions mainly as Na‐bearing diopside and pargasite with subordinate rutile and their formation was probably related to reaction between a MORB (mid‐ocean‐ridge basalt)‐like melt with depleted harzburgite, possibly in a back‐arc setting. Their host harzburgites contain clinopyroxene with higher contents of Al2O3, Na2O, Cr2O3, and TiO2 relative to Western harzburgites and are possibly residue after moderate partial melting (~15 %) whereas the Western harzburgite is residue after high partial melting (~25 %). The chromian spinel in the Western Khoy chromitites contains inclusions such as clinopyroxene, olivine and platinum group mineral‐bearing sulfides. These Western chromitites were possibly formed at two stages during arc growth and are divided into the moderately high‐Cr# chromitites (Barajouk and Hessar) and the high‐Cr# chromitites (Chuchak A and C). The former crystallized from island‐arc‐tholeiite (IAT) melts during reaction with the host depleted harzburgites, whereas the latter crystallized from boninitic melts (second stage melt) during reaction with highly depleted harzburgite in a supra‐subduction‐zone environment. Based on the mineral chemistry of chromian spinels, pyroxenes, and mineral inclusions, the chromitites and the host peridotites from the Eastern and Western Khoy ophiolites were formed in a back‐arc basin and arc‐related setting, respectively. The Khoy ophiolitic complex is a tectonic aggregate of the two different ophiolites formed in two different tectonic settings at different ages.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Mineral chemistry and petrogenesis of chromitites from theKhoy ophiolite complex,NorthwesternIran:Implications for aggregation of two ophiolites

et al. 2017

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“…An understanding of the origin of the MOC serpentinite is significant in evaluating the tectonic evolution of the subduction zone. A combination of petrological and geochemical studies of serpentinite can assist in determining the origin and geodynamic settings of serpentinization (Auzende et al, 2002;Hattori and Guillot, 2007;Saumur et al, 2010;Monsef et al, 2010). Raman spectroscopy can be used to study serpentine and the serpentinization processes (Kloprogge et al, 1999;Rinaudo et al, 2003;Auzende et al, 2004;Groppo et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Origin and serpentinization of ultramafic rocks of Manipur Ophiolite Complex in the Indo-Myanmar subduction zone, Northeast India

Ningthoujam

Dubey

Guillot

et al. 2012

Journal of Asian Earth Sciences

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“…The study area is shown by a rectangle different ophiolitic complexes in the Khoy area: one is the metamorphosed ophiolitic complex of Lower to Middle Jurassic age and the other is the non-metamorphosed ophiolitic complex of Upper Cretaceous age. Monsef et al (2010) reported a supra-subduction setting for the metamorphosed ophiolitic complex. Also, Alchalan (2011) considers that the non-metamorphosed ophiolitic complex was formed in a supra-subduction zone, based on the mineral chemistry of peridotites.…”

Section: Introductionmentioning

confidence: 99%

Mineral chemistry of the ophiolitic peridotites and gabbros from the Serow area: Implications for tectonic setting and locating the Neotethys suture in NW Iran

Rezaii¹,

Moazzen²

2014

Central European Geology

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The Serow ophiolite in NW Iran, located at the Iran-Turkey border, is composed of mantle sequence peridotites, predominantly lherzolitic-harzburgite with subordinate amounts of lherzolite and dunite, and a crustal sequence made from gabbros, diabases, pillow lavas and deep marine carbonates and radiolarite sediments. The rocks appear as a tectonic mélange. This ophiolitic complex forms part of the ophiolites marking a branch of Neotethys oceanic crust in NW Iran. The chemistry of olivine, orthopyroxene and clinopyroxene in the lherzolitic-harzburgite and clinopyroxene in the gabbros suggests a supra-subduction setting for the ophiolite. The Serow ophiolite is similar to other ophiolites in NW Iran such as the Piranshahr, Naghadeh and Khoy and NE Turkey ophiolites in terms of the rock units, tectonic setting and age. The Serow ophiolite links the Iranian ophiolites from Baft in the SE through the South Azerbaijan suture to the Izmir-Ankara-Erzincan suture in the NW.

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Peridotites from the Khoy Ophiolitic Complex, NW Iran: Evidence of mantle dynamics in a supra-subduction-zone context

Cited by 26 publications

References 77 publications

Mineral chemistry and petrogenesis of chromitites from theKhoy ophiolite complex,NorthwesternIran:Implications for aggregation of two ophiolites

Mineral chemistry and petrogenesis of chromitites from theKhoy ophiolite complex,NorthwesternIran:Implications for aggregation of two ophiolites

Origin and serpentinization of ultramafic rocks of Manipur Ophiolite Complex in the Indo-Myanmar subduction zone, Northeast India

Mineral chemistry of the ophiolitic peridotites and gabbros from the Serow area: Implications for tectonic setting and locating the Neotethys suture in NW Iran

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