The record of the Late Palaeozoic active margin of the Palaeotethys in NE Iran: Constraints on the Cimmerian orogeny

Zanchetta, Stefano; Berra, Fabrizio; Zanchi, Andréa; Bergomi, Maria; Caridroit, Martial; Nicora, Alda; Heidarzadeh, Ghasem

doi:10.1016/j.gr.2013.02.013

Cited by 109 publications

(93 citation statements)

References 56 publications

(102 reference statements)

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“…Detrital zircons with younger ages (Early Devonian) could be related to Paleotethys intra-oceanic subduction and continental-type magmatism on the nearby Turan plate (Eurasia) (Ghazi et al, 2001;Moghadam and Stern, 2014;Moghadam et al, 2015b;Zanchetta et al, 2013), but it is unlikely that such zircons could be transported across Paleo-Tethys to be deposited in Iran. The εHf (t) values of the Ordovician-Silurian detrital zircons (+6.3 to −3.6) are similar to those of Ordovician-Silurian alkaline gabbros (Shafaii Moghadam et al, unpublished data) and A-type granitic fragments (this study) (εHf (t)=+8.2 to+2.5).…”

Section: Implications For Paleozoic Sedimentary Sourcesmentioning

confidence: 99%

Early Paleozoic tectonic reconstruction of Iran: Tales from detrital zircon geochronology

Moghadam

Griffin

et al. 2017

Lithos

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In this study we use detrital zircons to probe the Early Paleozoic history of NE Iran and evaluate the link between sediment sources and Gondwanan pre-Cadomian, Cadomian and younger events. U-Pb zircon ages and Hf isotopic compositions are reported for detrital zircons from Ordovician and Early Devonian sedimentary rocks from NE Iran.These clastic rocks are dominated by zircons with major age populations at ~2.5 Ga, ~0.8-0.6 Ga, 0.5 Ga and ~0.5-0.4 Ga as well as a minor broad peak at ~1.0 Ga. The source of 2.5 Ga detrital zircons is enigmatic; they may have been supplied from the Saharan Metacraton (or West African Craton) to the southwest or Afghanistan-Tarim to the east. The detrital zircons with age populations at 0.8-0.6 Ga probably originated from Cryogenian-Ediacaran juvenile igneous rocks of the Arabian-Nubian Shield; this inference is supported by their juvenile Hf isotopes, although some negative εHf (t) values suggest that other sources (such as the West African Craton) were also involved.The age peak at ca 0.

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Section: Implications For Paleozoic Sedimentary Sourcesmentioning

confidence: 99%

Early Paleozoic tectonic reconstruction of Iran: Tales from detrital zircon geochronology

Moghadam

Griffin

et al. 2017

Lithos

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“…28 the Paleo-Tethys Ocean have been recognized and studied to a variable degree in many areas of the AHOB: those of the Caucasus and Turkey in the west, Iran, Afghanistan, and Turkmenistan in the centre and Tibet in the east define a series of diachronous subduction-related magmatic events and related accretionary complexes possibly including OPS units that were active/formed from at least Early Devonian to Late Permian time (Boulin, 1988;Zonenshain et al, 1990;Garzanti and Gaetani, 2002;Zanchetta et al, 2013;Zhai et al, 2013). For example, the Darrehanjir-Mashhad ophiolite belt in northern Iran, similarly to the OPS units of Japan, consists of mafic-ultramafic rocks, pillow lavas and pelagic sediments suggesting that that part of PaleoTethys evolved from oceanic crust formation above a subduction zone in Devonian time to accretionary convergence in Permian time (Moghadam et al, in press).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Recognizing OIB and MORB in accretionary complexes: A new approach based on ocean plate stratigraphy, petrology and geochemistry

et al. 2016

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“…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). In addition, evidence from northern (Talesh Mountains) and northeastern Iran (Mashhad-Fariman area) indicate the presence of a Late Palaeozoic, mainly Carboniferous active margin of the Palaeotethys, which is the same as in Central Iran (Nakhlak-Anarak units) developed during the Eo-Cimmerian orogenic cycle (Ghazi et al 2001;Zanchi et al 2009a;Zanchetta et al 2009Zanchetta et al , 2013. Within the SSZ, U-Pb zircon ages of Gushchi A-granites and gabbronorites in NW Iran indicate that the gabbronorites and granites were emplaced synchronously at ~ 320 Ma (Moghadam et al 2015).…”

Section: Discussionmentioning

confidence: 86%

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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The record of the Late Palaeozoic active margin of the Palaeotethys in NE Iran: Constraints on the Cimmerian orogeny

Cited by 109 publications

References 56 publications

Early Paleozoic tectonic reconstruction of Iran: Tales from detrital zircon geochronology

Early Paleozoic tectonic reconstruction of Iran: Tales from detrital zircon geochronology

Recognizing OIB and MORB in accretionary complexes: A new approach based on ocean plate stratigraphy, petrology and geochemistry

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

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