The Arkot Dağ Mélange in Araç area, central Turkey: Evidence of its origin within the geodynamic evolution of the Intra-Pontide suture zone

Göncüoğlu, M. Cemal; Marroni, Michèle; Pandolfi, Luca; Ellero, Alessandro; Ottria, Giuseppe; Catanzariti, Rita; Tekin, U. Kagan; Sayıt, Kaan

doi:10.1016/j.jseaes.2014.01.013

Cited by 48 publications

(19 citation statements)

References 37 publications

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“…Finally, the Intra‐Pontide suture with Middle Jurassic ophiolites, ophiolitic mélanges, and HP metamorphic rocks indicates that spreading occurred in another ocean basin in the Early‐Middle Jurassic (~180–170 Ma) at the southern margin of Eurasia (Göncüoglu et al, , ; Marroni et al, ; Okay et al, ; Şengör & Yilmaz, ; Ustaömer & Robertson, ). Various models suggesting the occurrence of multiple subduction zones at the southern margin of Eurasia have been proposed to explain the synchronous formation of the Intra‐Pontide and Izmir‐Ankara ophiolites, and their possible connection with the Balkan ophiolites (e.g., Bortolotti et al, ; Göncüoglu et al, ; Marroni et al, ; Robertson, ; Ustaömer & Robertson, ). Although beyond the scope of the current study, we consider two possible scenarios for the evolution of the Intra‐Pontide suture.…”

Section: Discussion: Plate Boundary Configuration Of the Middle Jurasmentioning

confidence: 99%

“…Around the same time, the first known subduction‐related geological records formed within the Neo‐Tethyan basins in the form of SSZ ophiolites of Early to Middle Jurassic age. These ophiolites were emplaced onto the Eurasian and Greater Adriatic paleomargins and are now found in the Pannonian basin, the Dinarides, Albanides, Hellenides, and the Rhodopes, as well as in the Pontides and Izmir‐Ankara suture zone of Turkey (e.g., Bortolotti et al, ; Bortolotti & Principi, ; Göncüoglu et al, , ; Hoeck et al, ; Maffione, Thieulot, et al, ; Robertson, , ; Schmid et al, ; Topuz et al, ; Ustaömer & Robertson, ) (Figure ). These earliest Neo‐Tethyan subduction zones in the central and eastern Mediterranean region formed contemporaneously with, and may have been caused by, the opening of the Central Atlantic Ocean that since ~175–170 Ma propagated as the Alpine Tethys into the western Mediterranean region separating Greater Adria from Iberia and Europe (e.g., Gaina et al, ; Labails et al, ; Maffione, Thieulot, et al, ; Stampfli et al, ; Vissers et al, , ).…”

Section: Geological Setting and The Concept Of The Neo‐tethys Oceanmentioning

confidence: 99%

“…The Intra‐Pontide suture (e.g., Şengör & Yilmaz, ) contains mainly Middle Jurassic ophiolites with MOR, SSZ, and BAB signatures (Göncüoglu et al, ; Ustaömer & Robertson, ), an ophiolitic mélange composed of ophiolitic fragments with both SSZ and BAB signatures, cherts with a Middle Triassic to Late Cretaceous age within a sedimentary matrix (Göncüoglu et al, ), and relics of an Upper Jurassic to Late Cretaceous high‐pressure metamorphic accretionary complex (Marroni et al, ; Okay et al, ).…”

Section: Geological Setting and The Concept Of The Neo‐tethys Oceanmentioning

confidence: 99%

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Reconstructing Plate Boundaries in the Jurassic Neo‐Tethys From the East and West Vardar Ophiolites (Greece and Serbia)

Maffione

Hinsbergen

2018

Tectonics

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Jurassic subduction initiation in the Neo‐Tethys Ocean eventually led to the collision of the Adria‐Africa and Eurasia continents and the formation of an ~6,000 km long Alpine orogen spanning from Iberia to Iran. Reconstructing the location and geometry of the plate boundaries of the now disappeared Neo‐Tethys during the initial moments of its closure is instrumental to perform more realistic plate reconstructions of this region, of ancient ocean basins in general, and on the process of subduction initiation. Neo‐Tethyan relics are preserved in an ophiolite belt distributed above the Dinaric‐Hellenic fold‐thrust belt. Here we provide the first quantitative constraints on the geometry of the spreading ridges and trenches active in the Jurassic Neo‐Tethys using a paleomagnetically based net tectonic rotation analysis of sheeted dykes and dykes from the West and East Vardar Ophiolites of Serbia (Maljen and Ibar) and Greece (Othris, Pindos, Vourinos, and Guevgueli). Based on our results and existing geological evidence, we show that initial Middle Jurassic (~175 Ma) closure of the western Neo‐Tethys was accommodated at a N‐S trending, west dipping subduction zone initiated near and parallel to the spreading ridge. The West Vardar Ophiolites formed in the forearc parallel to this new trench. Simultaneously, the East Vardar Ophiolites formed above a second N‐S to NW‐SE trending subduction zone located close to the European passive margin. We tentatively propose that this second subduction zone had been active since at least the Middle Triassic, simultaneously accommodating the closure of the Paleo‐Tethys and the back‐arc opening of Neo‐Tethys.

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Section: Discussion: Plate Boundary Configuration Of the Middle Jurasmentioning

confidence: 99%

Section: Geological Setting and The Concept Of The Neo‐tethys Oceanmentioning

confidence: 99%

Section: Geological Setting and The Concept Of The Neo‐tethys Oceanmentioning

confidence: 99%

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Reconstructing Plate Boundaries in the Jurassic Neo‐Tethys From the East and West Vardar Ophiolites (Greece and Serbia)

Maffione

Hinsbergen

2018

Tectonics

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“…The published data (Sengör & Yılmaz, 1981; Göncüoğlu et al 1987, 2008, 2012, 2014; Yılmaz, 1990; Göncüoğlu & Erendil, 1990; Robertson et al 1991; Okay et al 1996; Yılmaz et al 1997; Okay & Tüysüz, 1999; Okay, 2000; Robertson & Ustaömer, 2004; Akbayram, Okay & Satır, 2013; Marroni et al 2014) indicate that the IPS zone was formed by the closure of an oceanic basin, known as the Intra-Pontide Ocean (IPO) basin, located between two continental margins today represented by the IZ Terrane, to the north, and the SK Terrane, to the south (Fig. 1a).…”

Section: The Intra-pontide Suture Zone: An Overviewmentioning

confidence: 99%

Burial and exhumation history of the Daday Unit (Central Pontides, Turkey): implications for the closure of the Intra-Pontide oceanic basin

et al. 2017

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In northern Turkey, the Intra-Pontide suture zone represents one of the first-order tectonic structures located between the Istanbul–Zonguldak and the Sakarya continental terranes. It consists of an E–W-trending assemblage of deformed and variably metamorphosed tectonic units, including sedimentary rocks and ophiolites derived from a Neo-Tethyan oceanic basin, known as the Intra-Pontide oceanic basin. One of these units is represented by the Daday Unit that consists of a block-in-matrix assemblage derived from supra-subduction oceanic crust and related deep-sea sedimentary cover of Middle Jurassic age. This setting was acquired during Late Jurassic time by tectonic underplating at a depth of 35–42 km associated with blueschist-facies metamorphism (D1 phase). The following D2, D3 and D4 phases produced the exhumation of the Daday Unit up to shallower structural levels in a time span running from the Albian to late Paleocene. The high geothermal gradient detected during the D2 phase indicates that the Daday Unit was exhumed during a continent–arc collisional setting. The tectonic structures of the Intra-Pontide suture zone, resulting from the previously described tectonic history, are unconformably sealed by the upper Paleocene – Eocene deposits. This tectonic setting was intensely reworked by the activity of the North Anatolian Fault Zone, producing the present-day geometrical relationships of the Intra-Pontide suture zone of the Central Pontides.

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“…This interpretation is supported by the presence of the Late Jurassic MORBtype volcanism in the eastern Bolu area . Additional evidence gives Late Jurassic to early Late Cretaceous radiolarian ages from numerous outcrops within the CC (Göncüoğlu et al, 2012(Göncüoğlu et al, , 2014Tekin et al, 2012). Considering that the CC tectonically overlies the Late Jurassic-Cretaceous mélanges with an emplacement direction from N to S, we speculate that they (the Elekdağ, Domuz Dağ, Arkot Dağ, and Aylı Dağ mélanges) were originally located to the S of the Çangaldağ subduction.…”

Section: Geodynamic Discussionmentioning

confidence: 76%

Geochemistry of the metavolcanic rocks from the Çangaldağ Complex in the Central Pontides: implications for the Middle Jurassic arc-back-arc system in the Neotethyan Intra-Pontide Ocean

Çimen¹,

Göncüoğlu²,

Sayıt³

2016

Turkish J Earth Sci

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In the previous studies a number of different names were used for these units, which complicates their correlation (Sayit et al., 2016). The Çangaldağ Complex (CC; Ustaömer and Robertson, 1990) is one of these tectonic units located in the northern part of this structural complex, recently named as the Central Pontide Structural Complex (CPSC) by Tekin et al. (2012) or the Central Pontide Supercomplex by Okay et al. (2013). The CC is an arc-shaped body of approximately 50 km long and 40 km wide. It is geographically located between the subunits of the Sakarya Composite Terrane and the CPSC belonging to the Intra-Pontide Suture Belt. In addition, the absence of reliable ages and consistent petrological data for tectonomagmatic

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The Arkot Dağ Mélange in Araç area, central Turkey: Evidence of its origin within the geodynamic evolution of the Intra-Pontide suture zone

Cited by 48 publications

References 37 publications

Reconstructing Plate Boundaries in the Jurassic Neo‐Tethys From the East and West Vardar Ophiolites (Greece and Serbia)

Reconstructing Plate Boundaries in the Jurassic Neo‐Tethys From the East and West Vardar Ophiolites (Greece and Serbia)

Burial and exhumation history of the Daday Unit (Central Pontides, Turkey): implications for the closure of the Intra-Pontide oceanic basin

Geochemistry of the metavolcanic rocks from the Çangaldağ Complex in the Central Pontides: implications for the Middle Jurassic arc-back-arc system in the Neotethyan Intra-Pontide Ocean

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