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
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 data from one of these magmatic units, the Yerkuyu Unit, that forms an ENE-WSW trending 30-km long and 10-km wide lens-shaped body surrounded by the splays of the NASZ. The studied igneous lithologies have a subduction-related magmatic geochemical signature matching with another lozenge-shaped magmatic block of the Tafano Unit. However, the tectono-magmatic characterization indicates that the Tafano Unit magmatism developed within a continental arc tectonic setting, while the volcanic rocks of the Yerkuyu Unit derived from oceanic arc magmatism. This finding indicates that the subducted oceanic lithosphere of the İzmir-Ankara-Erzincan branch of the Neotethys Ocean produced oceanic volcanic arcs close to the subduction zone (i.e., the Yerkuyu Unit) and beneath the Sakarya continental microplate (i.e., the Tafano Unit).


Late Cretaceous stratigraphy in the Mudurnu-Goynuk Basin (Turkey) and inferences on sea-level change in the Late Campanian to Early Maastrichtian
Wolfgring, Erik; Wagreich, Michael; Yılmaz, İsmail Ömer; Liu Shasha, Liu Shasha; Boehm, Katharina (Geological Society of London, 2020-01-01)
Upper Cretaceous strata at Goynuk, northwestern Anatolia, Turkey, provide a geological record of the Campanian-Maastrichtian from the Sakarya Terrane along the active Neotethys margin. Shales and shaly marls with siliciclastic and volcaniclastic intercalations indicate a pelagic palaeoenvironment rich in planktonic and benthonic foraminifera and calcareous nannofossil assemblages. A composite record from the Campanian to the Maastrichtian records nannofossil standard zones UC15c (CC21) to UC20a (CC26) as we...
Ural, Melek; ARSLAN, MEHMET; Göncüoğlu, Mehmet Cemal; TEKİN, UĞUR KAĞAN; KÜRÜM, SEVCAN (2015-06-01)
The remnants of the Southern Neotethys are represented by ophiolitic bodies and subduction/accretion complexes along the Southeast Anatolian-Zagros suture belt in the Eastern Mediterranean. Around Malatya and Elazig areas (SE Turkey), they are found within imbricated slices of a melange complex, known as the Yuksekova Complex. The studied basaltic rocks are common members of this melange complex, and show distinctive features of sources with tholeiitic to tholeiitic-transitional character. Petrography, whol...
New zircon U-Pb LA-ICP-MS ages and Hf isotope data from the Central Pontides (Turkey): Geological and geodynamic constraints
ÇİMEN, OKAY; Göncüoğlu, Mehmet Cemal; Simonetti, Antonio; Sayıt, Kaan (2018-05-01)
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 th...
Late Cretaceous volcanic arc magmatism in southeast Anatolian Orogenic Belt: Constraints from whole-rock, mineral chemistry, Sr-Nd isotopes and U-Pb zircon ages of the Baskil Intrusive Complex (Malatya, Turkey)
NURLU, NUSRET; Köksal, Serhat; Kohut, Milan (2022-08-01)
The voluminous intrusive and extrusive magmatism was formed in the Elazig-Malatya region of the Southeast Anatolian Orogenic Belt (SAOB) as a consequence of the continental collision and/or convergent orogeny. The SAOB holds a great number of stratigraphic, metamorphic and tectonomagmatic units in the Elazig-Malatya region that are crucial for recognition of the geodynamic setting of southeast Anatolia during the Upper Cretaceous. The Baskil Intrusive Complex (BIC) is composed of mainly tonalitic/granodiori...
Early Cambrian back-arc volcanism in the western Taurides, Turkey: implications for rifting along the northern Gondwanan margin
Gursu, S; Göncüoğlu, Mehmet Cemal (2005-09-01)
The Lower Cambrian (Tommotian) Gogebakan Formation in western Central Anatolia is made up of slightly metamorphosed continental to shallow marine elastic rocks with pillowed and massive spilitic lavas and dolerite dykes. Spilitic lavas, commonly amygdaloidal, are albite-and pyroxene-phyric with the metamorphic mineral paragenesis albite + calcite + sericite +/- epidote +/- tremolite +/- chlorite. Dolerite dykes mainly include plagioclase and pyroxene as primary minerals and tremolite epidote chlorite as low...
Citation Formats
K. Sayıt et al., “Late Cretaceous Arc Magmatism in the Southern Central Pontides: Constraints for the closure of the Northern Neotethyan branches,” Ofioliti, vol. 47, no. 1, pp. 19–35, 2022, Accessed: 00, 2022. [Online]. Available: