Late Jurassic Magmatism and Stratigraphy in the Eastern Sakarya Zone, Turkey: Evidence for the Slab Breakoff of Paleotethyan Oceanic Lithosphere

Dokuz, Abdurrahman; Aydınçakır, Emre; Kandemir, Raif; Karslı, Orhan; Siebel, Wolfgang; Derman, A. Sami; Turan, Mehmet Tan

doi:10.1086/689552

Cited by 64 publications

(34 citation statements)

References 86 publications

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“…According to plate kinematic reconstructions, the Neo‐Tethys was ~3000 km wide in the Late Cretaceous [ e.g. , Gaina et al , ; Torsvik and Cocks , ], and since the middle Jurassic it started to be subducted to the north below the Pontides [ Okay et al , ; Dokuz et al , ]. This implies that the Triassic Neo‐Tethyan ridge, initially formed close to the northern margin of Gondwana (i.e., Anatolide‐Tauride block), must have been some 1500 km north of it by the Middle Jurassic.…”

Section: Discussionmentioning

confidence: 99%

“…The northern part of this orogen constitutes the Pontide mountain range of northern Turkey that contains deformed Paleozoic to Triassic basement interpreted to derive from the Sakarya continental block that collided with Eurasia in Triassic to Early Jurassic time [Şengör and Yilmaz, 1981;Sayıt and Göncüoglu, 2013;Okay et al, 2014;Dokuz et al, 2017]. These units are overlain by a Mesozoic sedimentary cover, including Jurassic to Cenozoic arc volcanic rocks [e.g., Okay et al, 2013;Dokuz et al, 2017]. To the north, the Pontides are separated from Eurasia by the Cretaceous-to-Paleogene Black Sea back-arc basin [Okay et al, 1994;Munteanu et al, 2011;Nikishin et al, 2015;Sosson et al, 2016], while to the South they are fringed by a belt known as the İzmir-Ankara suture zone.…”

Section: Geological Settingmentioning

confidence: 99%

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Kinematics of Late Cretaceous subduction initiation in the Neo‐Tethys Ocean reconstructed from ophiolites of Turkey, Cyprus, and Syria

et al. 2017

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Formation of new subduction zones represents one of the cornerstones of plate tectonics, yet both the kinematics and geodynamics governing this process remain enigmatic. A major subduction initiation event occurred in the Late Cretaceous, within the Neo‐Tethys Ocean between Gondwana and Eurasia. Suprasubduction zone ophiolites (i.e., emerged fragments of ancient oceanic lithosphere formed at suprasubduction spreading centers) were generated during this subduction event and are today distributed in the eastern Mediterranean region along three ~E‐W trending ophiolitic belts. Several models have been proposed to explain the formation of these ophiolites and the evolution of the associated intra‐Neo‐Tethyan subduction zone. Here we present new paleospreading directions from six Upper Cretaceous ophiolites of Turkey, Cyprus, and Syria, calculated by using new and published paleomagnetic data from sheeted dyke complexes. Our results show that ~NNE‐SSW subduction zones were formed within the Neo‐Tethys during the Late Cretaceous, which we propose were part of a major step‐shaped subduction system composed of ~NNE‐SSW and ~WNW‐ESE segments. We infer that this subduction system developed within old (Triassic?) lithosphere, along fracture zones and perpendicular weakness zones, since the Neo‐Tethyan spreading ridge formed during Gondwana fragmentation would have already been subducted at the Pontides subduction zone by the Late Cretaceous. Our new results provide an alternative kinematic model of Cretaceous Neo‐Tethyan subduction initiation and call for future research on the mechanisms of subduction inception within old (and cold) lithosphere and the formation of metamorphic soles below suprasubduction zone ophiolites in the absence of nearby spreading ridges.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Kinematics of Late Cretaceous subduction initiation in the Neo‐Tethys Ocean reconstructed from ophiolites of Turkey, Cyprus, and Syria

et al. 2017

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“…The Pontides mountain belt in northern Turkey contains Gondwana-derived fragments that had collided with Eurasia by the mid-Mesozoic time (e.g., Okay and Nikishin, 2015;Sengör and Yılmaz, 1981;Robertson, 1997, 2010;Dokuz et al, 2017). Since at least Early Jurassic time, the Pontides became bounded to the south by a northwarddipping subduction zone Topuz et al, 2014) that consumed Mesozoic Neotethyan oceanic crust.…”

Section: Basement Unitsmentioning

confidence: 99%

“…T a v ş a n lı z o n e Kissel et al, 1993;2: Platzman et al, 1998;3: Piper et al, 2002a, b;4: Kissel et al, 2003;5: Meijers et al, 2010a;6: Gürsoy et al, 2011;7: Meijers et al, 2011;8: Lucifora et al, 2012;9: Lefebvre et al, 2013;10: Piper et al, 2013;11: Çinku et al, 201611: Çinku et al, , 12: Baydemir, 199013: Channell et al, 1996;14: Orbay and Bayburdi, 1979;15: van der Voo, 1968. ern Eurasian margin since at least the mid-Mesozoic (Dokuz et al, 2017;Nikishin et al, 2015;Şengör and Yılmaz, 1981;Robertson, 2010, 1997), and the AnatolideTauride belt in the south. This latter belt is thought to have derived from a microcontinental realm that was separated from Eurasia and Africa by ocean basins and consists of metamorphosed and non-metamorphosed tectonic units overlain by Cretaceous ophiolites.…”

Section: Introductionmentioning

confidence: 99%

Paleomagnetic constraints on the timing and distribution of Cenozoic rotations in Central and Eastern Anatolia

et al. 2018

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Abstract. To quantitatively reconstruct the kinematic evolution of Central and Eastern Anatolia within the framework of Neotethyan subduction accommodating Africa-Eurasia convergence, we paleomagnetically assess the timing and amount of vertical axis rotations across the Ulukışla and Sivas regions. We show paleomagnetic results from ∼ 30 localities identifying a coherent rotation of a SE Anatolian rotating block comprised of the southern Kırşehir Block, the Ulukışla Basin, the Central and Eastern Taurides, and the southern part of the Sivas Basin. Using our new and published results, we compute an apparent polar wander path (APWP) for this block since the Late Cretaceous, showing that it experienced a ∼ 30-35 • counterclockwise vertical axis rotation since the Oligocene time relative to Eurasia. Sediments in the northern Sivas region show clockwise rotations. We use the rotation patterns together with known fault zones to argue that the counterclockwise-rotating domain of south-central Anatolia was bounded by the Savcılı Thrust Zone and Deliler-Tecer Fault Zone in the north and by the African-Arabian trench in the south, the western boundary of which is poorly constrained and requires future study. Our new paleomagnetic constraints provide a key ingredient for future kinematic restorations of the Anatolian tectonic collage.

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“…The northern part of the orogen is formed by the Pontides, which have been part of the southern Eurasian margin since at least the Mid-Mesozoic. The southern border of the Pontides, the Izmir-Ankara-Erzincan suture zone, demarcates the location of oceanic subduction since Jurassic time (Dokuz et al, 2017;and references therein;Fig. 1).…”

Section: Central Anatolian Geologymentioning

confidence: 99%

A long-lived Late Cretaceous–early Eocene extensional province in Anatolia? Structural evidence from the Ivriz Detachment, southern central Turkey

Gürer

Plunder

Kirst

et al. 2018

Earth and Planetary Science Letters

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Central Anatolia exposes previously buried and metamorphosed, continent-derived rocks -the Kır¸sehir and Afyon zones -now covering an area of ∼300 × 400 km. So far, the exhumation history of these rocks has been poorly constrained. We show for the first time that the major, >120 km long, top-NE 'Ivriz' Detachment controlled the exhumation of the HP/LT metamorphic Afyon Zone in southern Central Anatolia. We date its activity at between the latest Cretaceous and early Eocene times. Combined with previously documented isolated extensional detachments found in the Kır¸sehir Block, our results suggest that a major province governed by extensional exhumation was active throughout Central Anatolia between ∼80 and ∼48 Ma. Although similar in dimension to the Aegean extensional province to the east, the Central Anatolian extensional province is considerably older and was controlled by a different extension direction. From this, we infer that the African slab(s) that subducted below Anatolia must have rolled back relative to the Aegean slab since at least the latest Cretaceous, suggesting that these regions were underlain by a segmented slab. Whether or not these early segments already corresponded to the modern Aegean, Antalya, and Cyprus slab segments remains open for debate, but slab segmentation must have occurred much earlier than previously thought.

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Late Jurassic Magmatism and Stratigraphy in the Eastern Sakarya Zone, Turkey: Evidence for the Slab Breakoff of Paleotethyan Oceanic Lithosphere

Cited by 64 publications

References 86 publications

Kinematics of Late Cretaceous subduction initiation in the Neo‐Tethys Ocean reconstructed from ophiolites of Turkey, Cyprus, and Syria

Kinematics of Late Cretaceous subduction initiation in the Neo‐Tethys Ocean reconstructed from ophiolites of Turkey, Cyprus, and Syria

Paleomagnetic constraints on the timing and distribution of Cenozoic rotations in Central and Eastern Anatolia

A long-lived Late Cretaceous–early Eocene extensional province in Anatolia? Structural evidence from the Ivriz Detachment, southern central Turkey

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