Middle Permian–early Triassic magmatism in the Western Pontides, NW Turkey: Geodynamic significance for the evolution of the Paleo-Tethys

Aysal, Namık; Şahin, Sabah Yılmaz; Güngör, Yıldırım; Peytcheva, Irena; Öngen, Sinan

doi:10.1016/j.jseaes.2018.06.026

Cited by 25 publications

(18 citation statements)

References 66 publications

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“…Ustaömer et al 2012;Okay and Topuz 2017;Barrier et al 2018). Northward subduction created the early Carboniferous (320-330 Ma) granitic rocks of the Sakarya zone and those of late Carboniferous-Permian age more widely in the circum-Black Sea region (Okay and Topuz 2017;Aysal et al 2018;Bonev et al 2019). No definite evidence has so far been identified of a Late Palaeozoic suture zone and/ or subduction-accretion complex related to southward subduction between the Pontides and Eurasia, as in model 1 (Fig.…”

Section: Rheic Ocean-palaeotethyan Tectonicmagmatic Relationsmentioning

confidence: 94%

Late Palaeozoic extensional volcanism along the northern margin of Gondwana in southern Turkey: implications for Palaeotethyan development

Robertson

Parlak

Ustaömer

2021

Int J Earth Sci (Geol Rundsch)

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The Late Palaeozoic–Early Mesozoic Tethyan development of the Eastern Mediterranean region remains debatable, especially in Turkey, where alternative northward and southward subduction hypotheses are proposed. Relevant to this debate, new whole-rock geochemical data are provided here for early Carboniferous (Late Tournaisian-Late Visean; c. 340–350 Ma) tuffaceous sedimentary rocks within the Çataloturan thrust sheet (Aladağ nappe), eastern Taurides. The tuffs accumulated from evolved alkaline volcanism, variably mixed with terrigenous and radiolarian-rich sediments. In addition, Late Palaeozoic meta-volcanic rocks, c. 150 km farther NE, within the Binboğa (= Malatya) metamorphics (a low-grade high-pressure unit), are indicative of a within-plate setting. An impersistent geochemical subduction signature in these volcanics may represent an inherited, rather than contemporaneous, subduction influence, mainly because of the absence of a continental margin arc or of arc-derived tuff. Both the Binboğa metamorphics and the Çataloturan thrust sheet (Aladağ nappe) restore generally to the north of the relatively autochthonous Tauride carbonate platform (Geyik Dağ), within the carbonate platform bordering north-Gondwana. The Çataloturan thrust sheet is interpreted, specifically, as a c. E–W, deep-water, volcanically active rift that progressively infilled. Regional geological evidence suggests that melange units (Konya Complex, Afyon zone), Teke Dere unit, Lycian nappes), and Chios–Karaburun melange, E Aegean) accreted to the north-Gondwana continental margin during the late Carboniferous; this was coupled with localised calc-alkaline granitic magmatism (Afyon zone of Anatolide crustal block). We propose an interpretation in which Late Devonian–Carboniferous alkaline intra-plate volcanism relates to extension/rifting along the north-Gondwana margin. In contrast, the melange accretion and granitic magmatism could relate to short-lived late Carboniferous southward subduction that accompanied the diachronous closure of Palaeotethys.

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Section: Rheic Ocean-palaeotethyan Tectonicmagmatic Relationsmentioning

confidence: 94%

Late Palaeozoic extensional volcanism along the northern margin of Gondwana in southern Turkey: implications for Palaeotethyan development

Robertson

Parlak

Ustaömer

2021

Int J Earth Sci (Geol Rundsch)

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“…These plutons include the c. 268 Ma Kırklareli Pluton (Aysal et al 2018), the c. 252 Ma Ömeroba Pluton (Natal'in et al 2016Fig. 7), and the c. 249 Ma Tepecik Pluton, which is located near Istanbul in the southeastern Strandja Zone (Aysal et al 2018). For more detailed information about the published U-Pb zircon ages from Late Carboniferous to Triassic magmatic rocks in the Strandja Zone, see Table S3 in the Supplementary Material available online at https://doi.org/ 10.1017/S0016756821000650.…”

Section: A Interpretation Of Geochronology and Its Regional Contextmentioning

confidence: 99%

“…The exact age of Variscan metamorphism in the Strandja Zone remains unknown, but it is well established from the Balkanides (c. 340 -330 Ma; Carrigan et al 2006;Antić et al 2016;Balkanska et al 2021). The second scenario assumes that subduction of the Palaeo-Tethys Ocean beneath Laurussia played a primary role, resulting in various intrusions of volcanic-arc granites (VAG) in the Strandja Zone (Okay et al 2001;Natal'in et al 2016;Peytcheva et al 2016;Aysal et al 2018;Bonev et al 2019a). This scenario is presented by Aysal et al (2018), who suggested subduction-related magmatism with a transition from Permian arc magmatism to Middle Permian -Early Triassic back-arc magmatism.…”

Section: B Geochronological and Geochemical Arguments For Two-stage Magmatism In The Strandja Zonementioning

confidence: 99%

“…The Strandja Zone occurs between the Carpatho-Balkanides to the north and west and the Pontides to the east, and has been variously assigned to either zone (e.g. Okay et al 2001;Sunal et al 2006;Aysal et al 2018). It contains a series of units related to the Variscan and Alpine orogens, and is key to a better understanding of the Variscan Belt in this sector of Pangaea.…”

Section: Introductionmentioning

confidence: 99%

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Two stages of Late Carboniferous to Triassic magmatism in the Strandja Zone of Bulgaria and Turkey

et al. 2021

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Although Variscan terranes have been documented from the Balkans to the Caucasus, the southeastern portion of the Variscan Belt is not well understood. The Strandja Zone along the border between Bulgaria and Turkey encompasses one such terrane linking the Balkanides and the Pontides. However, the evolution of this terrane, and the Late Carboniferous to Triassic granitoids within it, is poorly resolved. Here we present laser ablation – inductively coupled plasma – mass spectrometry (LA-ICP-MS) U–Pb zircon ages, coupled with petrography and geochemistry from the Izvorovo Pluton within the Sakar Unit (Strandja Zone). This pluton is composed of variably metamorphosed and deformed granites which yield crystallization ages of c. 251–256 Ma. These ages are older than the previously assumed age of the Izvorovo Pluton based on a postulated genetic relationship between the Izvorovo Pluton and Late Jurassic to Early Cretaceous metamorphism. A better understanding of units across the Strandja Zone can now be achieved, revealing two age groups of plutons within it. An extensive magmatic episode occurred c. 312–295 Ma, and a longer-lived episode between c. 275 and 230 Ma. Intrusions associated with both magmatic events were emplaced into pre-Late Carboniferous basement, and were overprinted by Early Alpine metamorphism and deformation. These two stages of magmatism can likely be attributed to changes in tectonic setting in the Strandja Zone. Such a change in tectonic setting is likely related to the collision between Gondwana-derived terranes and Laurussia, followed by either subduction of the Palaeo-Tethys Ocean beneath Laurussia or rifting in the southern margin of Laurussia, with granitoids forming in different tectonic environments.

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“…The IZT is characterized by the Neoproterozoic crystalline basement (e.g., Bolu Massif; Ustaömer et al, 2005), which is unconformably overlain by the Paleozoic and Mesozoic cover units (e.g., Dean et al, 1997;Chen et al, 2002;Özgül, 2012;Okay et al, 2015). The Paleozoic cover units are locally cut by Permian granitoids (e.g., Şahin et al, 2009;Aysal et al, 2018). However, in contrast, the SCT is composed of Devonian magmatic rocks, for example, the Çamlık and Karacabey plutons (e.g., Aysal et al, 2012;Sunal, 2013); Variscan units, for example, the Söğüt, Devrekani and Pulur metamorphic rocks (e.g., Topuz et al, 2004;Nzegge, 2008;Ustaömer et al, 2012;Okay and Topuz, 2017) and the Cimmerian Karakaya complex basement (e.g., Okay and Göncüoğlu, 2004;Sayıt et al, 2010;Ustaömer et al, 2016), which is overlain by the Alpine cover units Göncüoğlu, 2010).…”

Section: Introductionmentioning

confidence: 99%

Petrology and 40Ar-39Ar dating of paragneisses from the Devrekani Massif (Central Pontides, Northern Turkey): Implications for the Jurassic high-T metamorphism in an extensional tectonic environment

Gücer

Arslan

Çimen

et al. 2019

Journal of Asian Earth Sciences

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Middle Permian–early Triassic magmatism in the Western Pontides, NW Turkey: Geodynamic significance for the evolution of the Paleo-Tethys

Cited by 25 publications

References 66 publications

Late Palaeozoic extensional volcanism along the northern margin of Gondwana in southern Turkey: implications for Palaeotethyan development

Late Palaeozoic extensional volcanism along the northern margin of Gondwana in southern Turkey: implications for Palaeotethyan development

Two stages of Late Carboniferous to Triassic magmatism in the Strandja Zone of Bulgaria and Turkey

Petrology and 40Ar-39Ar dating of paragneisses from the Devrekani Massif (Central Pontides, Northern Turkey): Implications for the Jurassic high-T metamorphism in an extensional tectonic environment

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