The Anarak, Jandaq and Posht-e-Badam metamorphic complexes in central Iran: New geological data, relationships and tectonic implications

Bagheri, Sasan; Stampfli, Gérard M.

doi:10.1016/j.tecto.2007.11.047

Cited by 318 publications

(330 citation statements)

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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%

“…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.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

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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“…These basement units are either part of the Anarak metamorphic complex sensu lato (Upper Palaeozoic-Triassic; see Bagheri and Stampfli 2008) or the weakly metamorphic Shemshak Group (Upper Triassic-Middle Jurassic; Für-sich et al 2009a). The basal unconformity is related to the Mid-/Late Cimmerian tectonic event/s (Middle to Late Jurassic; Fürsich et al 2009b;Wilmsen et al 2009bWilmsen et al , 2010.…”

Section: Lithostratigraphymentioning

confidence: 99%

Upper Albian and Cenomanian (Cretaceous) ammonites from the Debarsu Formation (Yazd Block, Central Iran)

Wilmsen

Storm²,

Fürsich

et al. 2013

Acta Geologica Polonica

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Wilmsen, M., Storm, M., Fürsich, F.T. and Majidifard, M.R. 2013. Upper Albian and Cenomanian (Cretaceous) ammonites from the Debarsu Formation (Yazd Block, Central Iran). Acta Geologica Polonica, 63 (4), 489-513. Warszawa. New ammonite faunas consisting of 13 taxa provide the first reliable biostratigraphic dating of the Debarsu Formation of the Yazd Block, west-central Iran, indicating several levels in the Upper Albian and Lower Cenomanian, while a foraminiferal assemblage places the top of the Formation in the Middle Turonian. Among the identified ammonite taxa, Acompsoceras renevieri (Sharpe, 1857) is recorded from Iran for the first time. The upper part of the lower Upper Albian is proved by the occurrences of mortoniceratines of the Mortoniceras (M.) inflatum Zone in the lowermost part of the Debarsu Formation. For the upper Upper Albian (traditional Stoliczkaia dispar Zone), the M. (Subschloenbachia ) rostratum and M. (S.) perinflatum zones are proved by their index taxa. However, there is no evidence of the terminal Arrhaphoceras (Praeschloenbachia) briacensis Zone. The upper part of the lower Lower Cenomanian Mantelliceras mantelli Zone (M. saxbii Subzone) is proved by M. saxbii and M. cf. mantelli. Below, there is an ammonite- barren interval of ca. 100 m in thickness between M. (S.) perinflatum zonal strata and the M. saxbii Subzone. The upper Lower Cenomanian is documented by the presence of typically M. dixoni zonal ammonites such as Acompsoceras renevieri. Upper Cenomanian and Turonian ammonites have not been found in the upper part of the Debarsu Formation, but micro-biostratigraphic evidence (planktonic foraminifers) from the uppermost part of the formation indicate that the formation ranges into the Turonian. For the development of the major tectonic unconformity at the base of the overlying Haftoman Formation (which yielded Lower Coniacian inoceramids near its base), only 2-3 myr remain, stressing the geodynamic activity of Central Iran during mid-Cretaceous times.

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“…This unit is surrounded by highly deformed domains of clear oceanic affinity, with ophiolite series and flysch-type rocks, particularly to the north, south and east (Stöcklin 1972). The present eastern border of the Lut Block would have belonged to the active margin of the subducted Neotethys Ocean (Dercourt et al 2000;Golonka 2004;Bagheri and Stampfli 2008). This ocean closed in eastern Iran, between the Afghan and Lut plates, in the OligoceneMiddle Miocene (Sengör and Natalin 1996).…”

Section: Introductionmentioning

confidence: 99%

Sr–Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu–Mo porphyry mineralizing intrusives from Lut Block, eastern Iran

Arjmandzadeh

Santos

2013

Int J Earth Sci (Geol Rundsch)

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The Dehsalm Cu-Mo-bearing porphyritic granitoids belong to the Lut Block volcanic-plutonic belt (central eastern Iran). These rocks range in composition from gabbro-diorite to granite, with dominance of monzonites and quartz monzonites, and have geochemical features of high-K calc-alkaline to shoshonitic volcanic arc suites. Primitive mantle-normalized trace element spider diagrams display strong enrichment in large-ion lithophile elements such as Rb, Ba and Cs and depletions in some high-field strength elements, e.g., Nb, Ti, Y and HREE. Chondrite-normalized plots display significant LREE enrichments, high La N /Yb N and a lack of Eu anomaly. High Sr/Y and La/Yb ratios of Dehsalm intrusives reveal that, despite their K-rich composition, these granitoids show some resemblances with adakitic rocks. A Rb-Sr whole rock-feldspar-biotite age of 33 ± 1 Ma was obtained in a quartz monzonite sample and coincides, within error, with a previous geochronological result in Chah-Shaljami granitoids, further northwest within the Lut Block. ( 87 Sr/ 86 Sr) i and eNd i isotopic ratios range from 0.70481 to 0.70508 and from

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The Anarak, Jandaq and Posht-e-Badam metamorphic complexes in central Iran: New geological data, relationships and tectonic implications

Cited by 318 publications

References 59 publications

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

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

Upper Albian and Cenomanian (Cretaceous) ammonites from the Debarsu Formation (Yazd Block, Central Iran)

Sr–Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu–Mo porphyry mineralizing intrusives from Lut Block, eastern Iran

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