Zircon U–Pb ages and geochemistry of Devonian A-type granites in the Iraqi Zagros Suture Zone (Damamna area): New evidence for magmatic activity related to the Hercynian orogeny

Abdulzahra, Imad Kadhim; Hadi, Ayten; Asahara, Yoshihiro; Azizi, Hossein; Yamamoto, Koshi

doi:10.1016/j.lithos.2016.09.006

Cited by 29 publications

(9 citation statements)

References 52 publications

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“…Farther to the east, a similar arc‐back‐arc system was also suggested by Murphy et al (2011) for the eastern peri‐Gondwanan terranes (northern New England; Figure 10a). This model is similar to that of Abdulzahra et al (2016) who proposed that the latest Devonian (364–372 Ma) A‐type granites in northwestern Iran, which are west of the Lhasa terrane, formed in a back‐arc extensional setting related to the southward subduction of the Paleo‐Tethys oceanic lithosphere. Farther to the west, the Carboniferous arc‐type granites described in the Afyon zone (Candan et al, 2016) and mélange‐type Carboniferous units on Chios Island, Karaburun, and Konya on the northern margin of the Anatolide‐Tauride Block (e.g., Robertson & Ustaömer, 2009) are also considered to have formed by southward subduction‐accretion processes in the Paleo‐Tethys Ocean (Candan et al, 2016; Robertson & Ustaömer, 2009).…”

Section: Discussionsupporting

confidence: 89%

Early Carboniferous Back‐Arc Rifting‐Related Magmatism in Southern Tibet: Implications for the History of the Lhasa Terrane Separation From Gondwana

et al. 2020

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The Lhasa terrane is widely regarded as an integral unit that separated from Gondwana in the Carboniferous or late Triassic, but this terrane may more reasonably consist of two subterranes that separated from Gondwana at different times. Here, we describe newly identified early Carboniferous (355-344 Ma) basic and intermediate intrusive rocks in the Xiongcun area, southern Tibet. The basic rocks that yield negative whole-rock ε Nd (t) values (−5.04 to −2.94) and zircon ε Hf (t) values (−9.2 to −1.7), combined with the chemical compositions, indicate that the magmas were derived by the partial melting of an enriched lithospheric mantle in a back-arc extensional setting. The intermediate rocks yield ε Nd (t) and ε Hf (t) values of −5.78 to −5.36 and −9.2 to −4.5, respectively, which suggests that they were likely produced via crust-mantle mixing. By combining our results with those of previous studies on the Lhasa terrane, we consider that a broad back-arc rift system, including northern and southern branches, developed along the northern margin of Gondwana under the southward subduction of the Paleo-Tethys oceanic lithosphere during the early Carboniferous. The northern branch evolved into the Sumdo Paleo-Tethys Ocean, which led to the separation of the North Lhasa terrane from northern Gondwana during the late Carboniferous. The subsequent northward subduction of the Sumdo Paleo-Tethys oceanic lithosphere beneath the North Lhasa terrane during the early to middle Permian may have triggered the southern branch to further evolve into the Neo-Tethys Ocean and eventually may have resulted in the South Lhasa terrane separating from Gondwana.

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Section: Discussionsupporting

confidence: 89%

Early Carboniferous Back‐Arc Rifting‐Related Magmatism in Southern Tibet: Implications for the History of the Lhasa Terrane Separation From Gondwana

et al. 2020

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“…Carboniferous magmatism is rare in the SSNZ and mostly occurs in NW Iran in the Salmas to Urumieh region (Figure ), where 322–317 Ma A‐type granites and gabbronorites intruded into Ediacaran (∼571 Ma) basement rocks [ Bea et al ., ; Moghadam et al ., ; Saccani et al ., ]. Late Paleozoic magmatism is also notable in Turkey, mainly in the Sakarya zone and in the Eastern Pontides [ Okay et al ., ; Dokuz et al ., ; Meinhold et al ., ] and in Iraq, along the Zagros Main Thrust [ Abdulzahra et al ., ]. The Eastern Pontides contain numerous Hercynian domains, characterized by HT‐LP metamorphic rocks [ Dokuz et al ., ].…”

Section: Discussionmentioning

confidence: 99%

Subduction, high‐P metamorphism, and collision fingerprints in South Iran: Constraints from zircon U‐Pb and mica Rb‐Sr geochronology

Moghadam

Bröcker

Griffin

et al. 2017

Geochem Geophys Geosyst

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The Esfandagheh region of the Zagros Orogenic Belt is an ideal area to address many aspects of continental convergence between Arabia and Eurasia, including incorporation of Late Neoproterozoic (Ediacaran) basement, subduction-related magmatism, and the formation of HP/LT rocks. The rock units exposed here represent a presumably Jurassic magmatic arc within the Sanandaj-Sirjan Zone (SSNZ), remnants of oceanic lithosphere, blueschist-and greenschist-facies rocks, and a distinct group of poorly characterized rocks. U-Pb ages define four populations, related to Paleoproterozoic, Ediacaran, Carboniferous, and Jurassic magmatic events. U-Pb ages of 1.8-1.7 Ga for a pegmatite represent the first report of Paleoproterozoic rocks in Iran. Zircon U-Pb ages from the SSNZ provide evidence for Ediacaran (547 Ma), Carboniferous (326-312 Ma), and Jurassic (194-186 Ma) magmatic activity. Zircons from the Haji-Abad ophiolites yielded Jurassic ages. The new Rb-Sr results from white micas provide indications of a poorly constrained >85 Ma high-pressure metamorphic history. Rb-Sr ages of two chlorite-epidoteactinolite schists indicate that greenschist-facies P-T conditions had already been attained around 130-125 Ma. The new results are consistent with a model in which the closure of the Esfandagheh Ocean and the subsequent collision between Arabia and Iran led to incorporation of Paleoproterozoic and Cadomian rock units and tectonic juxtaposition of all lithotectonic elements, from oceanic lithosphere to continental crust, along the Main Zagros Suture Zone.

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“…Carboniferous zircons with a peak at 330 Ma probably are related to the alkaline gabbros and A-type granites which are reported from NW Iran (Bea et al, 2011;, NE Iran (Naderi et al, 2018), SE Iran , and central Sanandaj-Sirjan zone (Shakerardakani et al, 2015). Carboniferous magmatism also is reported from NE Iraq (-W Iran) (Abdulzahra et al, 2016). It is suggested to be related to mantle upwelling and the initial rifting of Cimmerian away from Gondwana (Linnemann et al, 2008;Moghadam et al, 2013;Nance et al, 2010;Shafaii Moghadam et al, 2015).…”

Section: 1029/2019tc005963mentioning

confidence: 89%

Reconstructing the Source and Growth of the Makran Accretionary Complex: Constraints From Detrital Zircon U‐Pb Geochronology

et al. 2020

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We have used U-Pb zircon ages and Hf isotopic compositions for detrital zircons from Eocene and Cretaceous-Triassic sedimentary rocks of the Makran accretionary complex (MAC, Iran) to understand the source and growth of the MAC during Mesozoic and Cenozoic time. The Cenozoic sandstones reveal the main age distribution from Paleocene to Eocene with a peak at 54 Ma and show εHf(t) values of −47.7 to +12.1. Our compiled U-Pb-Hf data from both the Urumieh-Dokhtar Magmatic Belt magmatic zircons and the Paleogene Makran detrital zircons reveal that both Makran continental arc and Urumieh-Dokhtar Magmatic Belt are important suppliers of the Makran detrital zircons. Mesozoic zircons show dominant peaks at 94-91 (Late Cretaceous), 151 (Late Jurassic), and 229 Ma (Triassic). Detrital zircons with peaks at 91 and 151 Ma with εHf(t) values of −42.5 to +15.2 can be supplied by the erosion of Makran ophiolitic rocks, although negative εHf(t) values indicate some Makran detrital zircons came from reworking of the magmatic rocks of the Sanandaj-Sirjan zone of Iran. Late Cretaceous detrital zircons (~94-91 Ma) were also supplied from erosion of the nascent Makran arc. Middle to Late Jurassic zircons (163-151 Ma) can also come from erosion of the rifting-related magmatic rocks within the Bajgan-Durkan complex, although zircon U-Pb ages show middle Jurassic ages (170-165 Ma) for the Bajgan-Durkan magmatic rocks. Triassic zircons with εHf(t) values between −17 and +6.9 probably were supplied by the Bajgan-Durkan complex and/or by Central Iran magmatic rocks. Paleozoic detrital zircons show major peaks at 330 (Carboniferous) and 460 Ma (Ordovician). Their εHf(t) values range from −51 to +18.2 and −9.5 to +4.6, respectively. Carboniferous detrital zircons may have come from the erosion of alkaline gabbros and A-type granites reported from the NW, NE, SE, and central segments of the Sanandaj-Sirjan zone and/or may have been supplied from reworking of Carboniferous strata of the Bajgan-Durkan complex. Late Neoproterozoic-Early Cambrian detrital zircons with εHf(t) values from −42.9 to +32.4 are suggested to be derived from the Cadomian magmatic rocks of Iran and Anatolia. The pre-Cadomian detrital zircons with εHf(t) values of −28.9 to +27.5 are consistent with derivation from magmatic rocks of the Arabian-Nubian Shield. Archean (2.5 Ga) and Paleoproterozoic (2.4-1.8 Ga) detrital zircons probably come from the Afro-Arabian Craton and Saharan Metacraton. New data from detrital zircons imply that the MAC evolved from Triassic to Eocene and incorporated all orogenic elements including the continental lithosphere, oceanic crust, and its nearby continental arcs during its evolutionary cycle. Plain Language Summary U-Pb zircon ages and Hf isotopic compositions for detrital zircons are used to understand the source and growth of the Makran accretionary complex during Mesozoic and Cenozoic time. The Cenozoic sandstones reveal important suppliers from both Makran continental arc and Urumieh-Dokhtar Magmatic Belt, while Mesozoic zircons show reso...

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Zircon U–Pb ages and geochemistry of Devonian A-type granites in the Iraqi Zagros Suture Zone (Damamna area): New evidence for magmatic activity related to the Hercynian orogeny

Cited by 29 publications

References 52 publications

Early Carboniferous Back‐Arc Rifting‐Related Magmatism in Southern Tibet: Implications for the History of the Lhasa Terrane Separation From Gondwana

Early Carboniferous Back‐Arc Rifting‐Related Magmatism in Southern Tibet: Implications for the History of the Lhasa Terrane Separation From Gondwana

Subduction, high‐P metamorphism, and collision fingerprints in South Iran: Constraints from zircon U‐Pb and mica Rb‐Sr geochronology

Reconstructing the Source and Growth of the Makran Accretionary Complex: Constraints From Detrital Zircon U‐Pb Geochronology

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