Paleozoic to Triassic ocean opening and closure preserved in Central Iran: Constraints from the geochemistry of meta-igneous rocks of the Anarak area

Buchs, David M.; Bagheri, Sasan; Martin, Laure; Hermann, Jörg; Arculus, R. J.

doi:10.1016/j.lithos.2013.02.009

Cited by 56 publications

(35 citation statements)

References 52 publications

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“…The observed absence of sedimentation from Late Triassic to Lower Early Jurassic (Fig. 5) was a result of the closure of a Paleotethys Basin branch along North Iran (Berberian and King 1981;Bagheri and Stampfli 2008;Zanchi et al 2009;Buchs et al 2013). From the Late Permian to the Late Triassic, forces from the spreading of the Neotethys mid-ocean ridge caused the subduction of the Paleotethys oceanic lithosphere; following closure of the Paleotethys Ocean in the Late Triassic, tectonic forces caused epeirogeny in the Neotethys Basin.…”

Section: Subduction Of the Oceanic Lithosphere Stage (Triassic-late Cmentioning

confidence: 99%

Tectonic evolution of the Zagros Orogen in the realm of the Neotethys between the Central Iran and Arabian Plates: An ophiolite perspective

Ajirlu

Moazzen

Hajialioghli

2016

Central European Geology

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Section: Subduction Of the Oceanic Lithosphere Stage (Triassic-late Cmentioning

confidence: 99%

Tectonic evolution of the Zagros Orogen in the realm of the Neotethys between the Central Iran and Arabian Plates: An ophiolite perspective

Ajirlu

Moazzen

Hajialioghli

2016

Central European Geology

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“…However, in the last decade, more and more evidence has appeared for the existence of Carboniferous to earliest Permian orogenic events in Central Iran (Bagheri & Stampfli 2008;Zanchi et al 2009a and b;Buchs et al 2013;Kargaranbafghi et al 2015), in the Sanandaj-Sirjan Zone (Advay & Ghalamghash 2011;Bea et al 2011;Moghadam et al 2015) but also in the Eastern Pontides in Turkey (Topuz et al 2010;Kaygusuz et al 2012) and in the northern part of the Arabian plate (Tavakoli-Shirazi et al 2013;Frizon de Lamotte et al 2013;Stern et al 2014). Within the Palaeotethys, Bagheri & Stampfli (2008) postulated "Variscan" terrane accretion in Central Iran, also supported by abundant "Variscan" detritus in Mesozoic sediments of Central Iran (Kargaranbafghi et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Geochemical and isotopic evidence for Carboniferous rifting: mafic dykes in the central Sanandaj-Sirjan zone (Dorud-Azna, West Iran)

Shakerardakani¹,

Neubauer²,

Bernroider³

et al. 2017

Geologica Carpathica

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Abstract:In this paper, we present detailed field observations, chronological, geochemical and Sr-Nd isotopic data and discuss the petrogenetic aspects of two types of mafic dykes, of alkaline to subalkaline nature. The alkaline mafic dykes exhibit a cumulate to foliated texture and strike NW-SE, parallel to the main trend of the region. The 40 Ar/ 39 Ar amphibole age of 321.32 ± 0.55 Ma from an alkaline mafic dyke is interpreted as an indication of Carboniferous cooling through ca. 550 °C after intrusion of the dyke into the granitic Galeh-Doz orthogneiss and Amphibolite-Metagabbro units, the latter with Early Carboniferous amphibolite facies grade metamorphism and containing the Dare-Hedavand metagabbro with a similar Carboniferous age. The alkaline and subalkaline mafic dykes can be geochemically categorized into those with light REE-enriched patterns [(La/Yb) N = 8.32-9.28] and others with a rather flat REE pattern [(La/Yb) N = 1.16] and with a negative Nb anomaly. Together, the mafic dykes show oceanic island basalt to MORB geochemical signature, respectively. This is consistent, as well, with the (Tb/Yb) PM ratios. The alkaline mafic dykes were formed within an enriched mantle source at depths of ˃ 90 km, generating a suite of alkaline basalts. In comparison, the subalkaline mafic dykes were formed within more depleted mantle source at depths of ˂ 90 km. The subalkaline mafic dyke is characterized by 87 Sr/ 86 Sr ratio of 0.706 and positive ɛ Nd (t) value of + 0.77, whereas 87 Sr/ 86 Sr ratio of 0.708 and ɛ Nd (t) value of + 1.65 of the alkaline mafic dyke, consistent with the derivation from an enriched mantle source. There is no evidence that the mafic dykes were affected by significant crustal contamination during emplacement. Because of the similar age, the generation of magmas of alkaline mafic dykes and of the Dare-Hedavand metagabbro are assumed to reflect the same process of lithospheric or asthenospheric melting. Carboniferous back-arc rifting is the likely geodynamic setting of mafic dyke generation and emplacement. In contrast, the subalkaline mafic sill is likely related to the emplacement of the Jurassic Darijune gabbro.

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“…Even though limited in volume, the Middle to Upper Triassic mafic rocks are widespread through the SSZ (e.g., Berberian and King 1981;Badrzadeh et al 2011;Mousivand et al 2012) and Central Iran (e.g., Bagheri and Stampfli 2008;Buchs et al 2013). In the southeastern of SSZ, Arvin et al (2007) reported calcalkaline, I-type granites with a Sm-Nd 'errorchron' age of 199 ± 30 Ma and interpreted this suite to have formed in a volcanic arc setting due to onset of Neotethys subduction.…”

Section: Tectonic Setting Implicationsmentioning

confidence: 99%

“…Late Palaeozoic (Permian) rifting of the future Neotethys Ocean has formed ribbon continental fragments in Iran that broke away from the northern margin of Gondwana (e.g., Berberian and King 1981;Ş engör 1990;Stampfli et al 1991;Stampfli and Borel 2002;Mohajjel et al 2003;Ghasemi and Talbot 2006;Agard et al 2011;Richards 2015) although relationships to Triassic terrane accretion to the north of Central Iran remains partly unclear (Buchs et al 2013;Zanchi et al 2015). This contribution deals with the Sanandaj-Sirjan zone (SSZ; Fig.…”

Section: Introductionmentioning

confidence: 99%

Tectonic significance of Triassic mafic rocks in the June Complex, Sanandaj–Sirjan zone, Iran

et al. 2017

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This study concentrates on the petrological and geochemical investigation of mafic rocks embedded within the voluminous Triassic June Complex of the central Sanandaj-Sirjan zone (Iran), which are crucial to reconstruct the geodynamics of the Neotethyan passive margin. The Triassic mafic rocks are alkaline to sub-alkaline basalts, containing 43.36-49.09 wt% SiO 2 , 5.19-20.61 wt% MgO and 0.66-4.59 wt% total alkalis. Based on MgO concentrations, the mafic rocks fall into two groups: cumulates (Mg# = 51.61-58.94) and isotropic basaltic liquids (Mg# = 24.54-42.66). In all samples, the chondrite-normalized REE patterns show enrichment of light REEs with variable (La/Yb) N ratios ranging from 2.48 to 9.00, which confirm their amalgamated OIB-like and E-MORB-like signatures. Enrichment in large-ion lithophile elements and depletion in high field strength elements (HFSE) relative to the primitive mantle further support this interpretation. No samples point to crustal contamination, all having undergone fractionation of olivine ? clinopyroxene ? plagioclase. Nevertheless, elemental data suggest that the substantial variations in (La/Sm) PM and Zr/Nb ratios can be explained by variable degrees of partial melting rather than fractional crystallization from a common parental magma. The high (Nb/Yb) PM ratio in the alkaline mafic rocks points to the mixing of magmas from enriched and depleted mantle sources. Abundant OIB alkaline basalts and rare E-MORB appear to be linked to the drifting stage on the northern passive margin of the Neotethys Ocean.

show abstract

Paleozoic to Triassic ocean opening and closure preserved in Central Iran: Constraints from the geochemistry of meta-igneous rocks of the Anarak area

Cited by 56 publications

References 52 publications

Tectonic evolution of the Zagros Orogen in the realm of the Neotethys between the Central Iran and Arabian Plates: An ophiolite perspective

Tectonic evolution of the Zagros Orogen in the realm of the Neotethys between the Central Iran and Arabian Plates: An ophiolite perspective

Geochemical and isotopic evidence for Carboniferous rifting: mafic dykes in the central Sanandaj-Sirjan zone (Dorud-Azna, West Iran)

Tectonic significance of Triassic mafic rocks in the June Complex, Sanandaj–Sirjan zone, Iran

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