New zircon U-Pb LA-ICP-MS ages and Hf isotope data from the Central Pontides (Turkey): Geological and geodynamic constraints

Göncüoğlu, Mehmet Cemal
Simonetti, Antonio
Sayıt, Kaan
The Central Pontides in northern Anatolia is located on the accretionary complex formed by the closure of Neotethyan Intra-Pontide Ocean between the southern Eurasian margin (Istanbul-Zonguldak Terrane) and the Cimmerian Sakarya Composite Terrane. Among other components of the oceanic lithosphere, it comprises not yet well-dated felsic igneous rocks formed in arc-basin as well as continent margin settings. In-situ U-Pb age results for zircons from the arc-basin system (tiangaldag Metamorphic Complex) and the continental arc (Devrekani Metadiorite and Granitoid) yield ages of 176 +/- 6 Ma, 163 +/- 9 Ma and 165 +/- 3 Ma, respectively. Corresponding in-situ average (initial) Hf-176/Hf-177 initial ratios are 0.28261 +/- 0.00003, 0.28267 +/- 0.00002 and 0.28290 +/- 0.00004 for these units and indicative of a subduction-modified mantle source. The new U-Pb ages and Hf isotope data from these oceanic and continental arc units together with regional geological constraints support the presence of a multiple subduction system within the Intra-Pontide Ocean during the Middle Jurassic.


Late Cretaceous Arc Magmatism in the Southern Central Pontides: Constraints for the closure of the Northern Neotethyan branches
Sayıt, Kaan; Cemal Göncüoğlu, M.; Ellero, Alessandro; Ottria, Giuseppe; Frassi, Chiara; Marroni, Michele; Pandolfi, Luca (2022-01-31)
In the southern Central Pontides in northern Turkey the remnants of two Neotethyan oceanic basins, currently represented by the Intra-Pontide and the Izmir-Ankara-Erzincan sutures, and the interposing continental microplate (i.e., the Sakarya Composite Terrane) are completely dissected by the North Anatolian Shear Zone (NASZ). Within the resulting kilometre-scale, strike-slip fault-bounded blocks, several Late Cretaceous arc-type magmatic units have been detected. In this paper, we present new geochemical d...
New Finite Frequency Teleseismic P wave Tomography of the Anatolian Sub continent and the Fate of the SubductedCyprean Slab
Portner, Daniel Evan; Biryol, C Berk; Delph, Jonathan R; Beck, Susan L; Zandt, George; Özacar, Atilla Arda; Eric A, Sandvol; Türkelli, Niyazi (2016-12-12)
The eastern Mediterranean region is characterized by active subduction of Tethyan lithosphere beneath the Anatolian sub-continent at the Aegean and Cyprean trenches. The subduction system is historically characterized by slab roll-back, detachment, and slab settling in the mantle transition zone. Prior mantle tomography studies reveal segmentation of the subducted Tethyan lithosphere, which is thought to have a strong control on surface volcanism and uplift across Anatolia. However, tomographic resolution, ...
The Intra-Pontide ophiolites in Northern Turkey revisited: From birth to death of a Neotethyan oceanic domain
Marroni, Michele; Göncüoğlu, Mehmet Cemal; Frassi, Chiara; Sayıt, Kaan; Pandolfi, Luca; Ellero, Alessandro; Ottria, Giuseppe (2020-01-01)
The Anatolian peninsula is a key location to study the central portion of the Neotethys Ocean(s) and to understand how its western and eastern branches were connected. One of the lesser known branches of the Mesozoic ocean(s) is preserved in the northern ophiolite suture zone exposed in Turkey, namely, the Intra-Pontide suture zone. It is located between the Sakarya terrane and the Eurasian margin (i.e., Istanbul-Zonguldak terrane) and consists of several metamorphic and non-metamorphic units containing oph...
First Balanced Cross Section Across the Taurides Fold-Thrust Belt: Geological Constraints on the Subduction History of the Antalya Slab in Southern Anatolia
McPhee, Peter J.; Altıner, Demir; van Hinsbergen, Douwe J. J. (2018-10-01)
Eastern Mediterranean subduction accommodated Africa-Eurasia convergence since Mesozoic time and produced multiple subducted slab fragments in the mantle below Anatolia. These included the north dipping Cyprus and ENE-dipping Antalya slabs, which are currently separated by an upper mantle slab gap. Segmentation of these slabs, and associated mantle flow, may have contributed to <8 Ma uplift of the Central Anatolian Plateau. The western Central Taurides fold-thrust belt in southern Turkey is in the upper pla...
New age data from the tectonostratigraphic units of the Istranca "Massif" in NW Turkey: a correlation with SE Bulgaria
Bedi, Yavuz; Vasilev, Emil; Dabovski, Christo; Ergen, Ali; OKUYUCU, CENGİZ; Dogan, Adil; TEKİN, UĞUR KAĞAN; Ivanova, Daria; Boncheva, Iliana; Lakova, Iskra; Sachanski, Valeri; Kuscu, Ismail; Tuncay, Ercan; Demiray, D. Gulnur; Soycan, Havva; Göncüoğlu, Mehmet Cemal (2013-8-01)
The Istranca Crystalline Complex in NW Anatolia and SE Bulgaria includes structural units that differ in lithostratigraphy, metamorphism, age and structural position. They are collectively named as the "Istranca nappes" comprising from bottom to top the Sarpdere, Mahyadag. and Dogankoy Nappes. The Sarpdere Nappe consists of Lower Triassic arkosic metasandstones with slate interlayers, followed by Middle to Upper Triassic carbonates and an alternation of Upper Triassic clastics and carbonates. The Mahyada. g...
Citation Formats
O. ÇİMEN, M. C. Göncüoğlu, A. Simonetti, and K. Sayıt, “New zircon U-Pb LA-ICP-MS ages and Hf isotope data from the Central Pontides (Turkey): Geological and geodynamic constraints,” JOURNAL OF GEODYNAMICS, pp. 23–36, 2018, Accessed: 00, 2020. [Online]. Available: