The Intra-Pontide suture zone in the Tosya-Kastamonu area, Northern Turkey

Frassi, Chiara; Göncüoğlu, Cemal; Marroni, Michèle; Pandolfi, Luca; Ruffini, Leonardo; Ellero, Alessandro; Ottria, Giuseppe; Sayıt, Kaan

doi:10.1080/17445647.2016.1192330

Cited by 17 publications

(8 citation statements)

References 18 publications

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“…Where the original structure of the IPS zone is preserved the tectonic units are bounded by E–W-trending, low-angle shear zones (e.g. Frassi et al 2016).…”

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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“…Where the original structure of the IPS zone is preserved the tectonic units are bounded by E–W-trending, low-angle shear zones (e.g. Frassi et al 2016).…”

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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“…The Taşcilar basin is an approximately 5 km long and 2 km wide basin located within the central bend of the NASZ (Figure ; Appendix S1). The Taşcilar basin unconformably developed inside two tectonic units belonging to the imbricate stack of the Intra‐Pontide suture zone (Frassi et al., ; Göncüoğlu, Gürsu, Tekin, & Koksal, ; Göncüoğlu et al., ; Okay et al., ; Sayit et al., ): the Upper Cretaceous ophiolite‐bearing Arkot Dağ Mélange (Göncüoğlu et al., ) and the Domuz Dağ metamorphic Unit (Okay et al., ). The basin shows a roughly trapezoidal shape and is bounded by a complex network of high‐angle faults, where the master faults, corresponding to the northern and southern margins of the basin, are parallel to the NASZ system (Figure ).…”

Section: Tectonic Setting Of the Taşcilar Basinmentioning

confidence: 99%

Evolution of an early Eocene pull‐apart basin in the Central Pontides (Northern Turkey): New insights into the origin of the North Anatolian Shear Zone

et al. 2017

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Although the North Anatolian Shear Zone is one of the main lithospheric‐scale strike‐slip deformation zone in the world, playing a prominent role in the complex geodynamic interaction among the Eurasian, Anatolian and Arabian plates, the onset time of its activity remains highly controversial. Here, we tackle this issue by utilizing nannofossil biostratigraphy on deposits from the Taşcilar basin, a pull‐apart basin that we have identified inside the North Anatolian Shear Zone overprinting the Intra‐Pontide suture zone. The syn‐tectonic sedimentary succession of the Taşcilar basin developed completely during the early Eocene (Ypresian; CNE4–CNE5 Zones). The strike‐slip faulting related to the initial onset of the North Anatolian Shear Zone can likely be constrained within the Ypresian, suggesting that the westward escape of the Anatolian plate along the North Anatolian Shear Zone started in the early Eocene.

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“…The remnants of this oceanic basin were recently named as the Central Pontide Structural Complex (Tekin et al, 2012). From a number of imbricated tectonic units (for details see Frassi et al, 2016;Marroni et al, 2020) only the "Arkot Dağ Mélange (Göncüoğlu et al, 2014)" and the "Aylı Dağ Ophiolite (Göncüoğlu et al, 2012)" are located immediately at the northern boundary of the KM (Figure 1b).…”

Section: Regional Geological Frameworkmentioning

confidence: 99%

Geochemistry and U-Pb ages from the Kösdağ Metavolcanics in the southern Central Pontides (Turkey): Complementary data for early Late Cretaceous island arc development in the Northern Neotethys

Berber¹,

Sayıt²,

Göncüoğlu³

2021

Turkish J Earth Sci

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The Kösdağ Metavolcanics in the southern Central Pontides is exposed between the Izmir-Ankara-Erzincan Suture Belt in the south and the Sakarya Composite Terrane in the north. It comprises an approximately 40 km long tectonic unit, bounded by the splays of the North Anatolian Transform Fault in the north and the Kızılca Thrust in the south. The basement of the unit mainly consists of metabasalts, metaandesites, and metarhyolites with well-developed blastomylonitic textures, interlayered by recrystallized pelagic limestone and chert. Late Cretaceous pelagic limestones of the Dikmen Formation disconformably overlie the basement. Geochemically, the Kösdağ Metavolcanics exhibit enrichment in Th and La relative to Nb (and Ti), indicating subduction-related magmatic signatures. The Kösdağ Metavolcanics are subdivided into two main types as Type 1 and Type 2 based on their relative Zr-Hf enrichment/depletion features. All the members of the Kösdağ Metavolcanics have subalkaline nature (Nb/Y = 0.08-0.19 for Type 1; Nb/Y = 0.05-0.13 for Type 2) and display a calc-alkaline affinity. The high Zr/Nb (38.1-52.9 for Type 1, 2 21.8-41.2 for Type 2), low Zr/Y (4.07-5.25 for Type 1, 1.58-2.44 for Type 2) and Nb/Y (0.08-0.14 for Type 1, 0.05-0.10 for Type 2) signatures of the Kösdağ Metavolcanics indicate that they have derived from a depleted source which has been modified by subduction component. Zircons LA-ICP-MS U-Pb ages from metarhyolite samples range between 94.64 ± 0.77 Ma and 113.2 ± 2.3 Ma suggesting the presence of an intraoceanic subduction zone during the early Late Cretaceous within the Izmir-Ankara-Erzincan branch of the Neotethys Ocean in the Central Pontides.

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The Intra-Pontide suture zone in the Tosya-Kastamonu area, Northern Turkey

Cited by 17 publications

References 18 publications

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

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

Evolution of an early Eocene pull‐apart basin in the Central Pontides (Northern Turkey): New insights into the origin of the North Anatolian Shear Zone

Geochemistry and U-Pb ages from the Kösdağ Metavolcanics in the southern Central Pontides (Turkey): Complementary data for early Late Cretaceous island arc development in the Northern Neotethys

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