The Cele mafic complex: Evidence for Triassic collision between the Sakarya and Istanbul Zones, NW Turkey

Bozkurt, Erdin
Satir, Muharrem
The lowest structural levels of the Istanbul Zone are exposed in the Sunnice Massif, north of Bolu. They comprise the greenschist-facies Ediacaran calc-alkaline bimodal Yellice metavolcanics, which are intruded by the Dirgine granitoid. Amphibolite-facies mafic and subordinate ultramafic rocks of the Cele mafic complex, hitherto termed the Cele meta-ophiolite, include hornblende gneisses of island arc meta-tholeiitic and transitional to calc-alkaline metagabbroic compositions, and were previously thought to be part of the Istanbul Zone basement. Together with minor serpentinized troctolite and harzburgite lenses, they are exposed in a broadly antiformal structure beneath the Yellice metavolcanics. Although these rocks structurally underlie, and, on account of their higher metamorphic grade, were previously thought to be older than the Ediacaran-Cambrian rocks of the Istanbul Zone basement, their oldest isotopic dates are Permian, indicating that they are instead much younger than the overlying rocks, from which they must be divided by an (inferred) Istanbul Zone basal thrust. Instead, these mafic rocks may be linked to the Almacrk Complex, and hence interpreted as the under-thrust crustal base to a Permo-Triassic active continental margin attached to the Gondwana-derived Sakarya Zone now located south of the Istanbul Zone. Triassic and Jurassic metamorphic ages record compressional events marking a Cimmerian event closing the Palaeotethys Ocean.


Proterozoic ophiolites and mafic-ultramafic complexes marginal to the Istanbul Block: An exotic terrane of Avalonian affinity in NW Turkey
Bozkurt, Erdin; YİĞİTBAŞ, ERDİNÇ; Ottley, Christopher J. (Elsevier BV, 2008-12-01)
Among the Proterozoic inliers in the Istanbul Block, the lowest structural levels are exposed in the Sunnice Massif, north of Bolu. Amphibolite-facies mafic and subordinate ultramafic rocks of the Cele meta-ophiolite underlie the greenschist-facies Ediacaran calc-alkaline Yellice metavolcanics, which are intruded by the similar to 565-576 Ma Dirgine granitoids. Homblende gneisses of the Cele meta-ophiolite comprise island arc metatholeiites and transitional to calc-alkaline metabasalts which, together with ...
The Tarakli Flysch in the Boyali area (Sakarya Terrane, northern Turkey): Implications for the tectonic history of the IntraPontide suture zone
Catanzariti, Rita; Ellero, Alessandro; Göncüoğlu, Mehmet Cemal; Marroni, Michele; Ottria, Giuseppe; Pandolfi, Luca (2013-11-01)
In the Boyali area, northern Turkey, the tectonic units of the Istanbul-Zonguldak Terrane and the IntraPontide suture zone are thrust over the deposits at the top of the Sakarya Terrane, known as Tarakli Flysch. It consists of Early Maastrichtian-Middle Paleocene turbidite and mass-gravity deposits, whose source mainly corresponds to the Istanbul-Zonguldak Terrane, and, with a lesser extent, to the IntraPontide suture zone. These deposits were sedimented in a foredeep basin developed during the convergence ...
Late quaternary sedimentation in the strait of bosporus: high-resolution seismic profiling
Alavi, Seyed Naeim; Okyar, Mahmut; Köse, Timur (Elsevier BV, 1989-10)
Uniboom profiling supported by borehole data in the southern part of the Bosporus revealed that close to its banks Holocene sediments are underlain by the faulted slopes of a valley cut in many places into the Palaeozoic bedrock. Away from the banks the sediments thicken and their boundary with the underlying Pleistocene deposits is defined by an erosional surface at about the 80 ms TWT. This surface marks the initiation of marine currents in the valley as its deeper parts began to be submerged in the late ...
The Kapanbogazi formation: A key unit for understanding Late Cretaceous evolution of the Pontides, N Turkey
TÜYSÜZ, OKAN; Melinte-Dobrinescu, Mihaela C.; Yılmaz, İsmail Ömer; Kirici, Sabri; Svabenicka, Lilian; Skupien, Peter (Elsevier BV, 2016-01-01)
The Pontides forming the south-western continental margin of the Black Sea consist of two tectonic units, the Istanbul Zone in the west, and the Sakarya Zone in the central and eastern parts. The Sinop Basin in the Sakarya Zone is filled, from base to top, by Hauterivian to Albian turbidites, Cenomanian-Turonian red pelagic sediments, Turonian-Campanian magmatic-arc and related deposits, and by the uppermost Campanian to middle Eocene post-magmatic units developed on the southern passive margin of the Black...
The Intra-Pontide suture zone in the Tosya-Kastamonu area, Northern Turkey
Frassi, Chiara; Goncuoglu, Cemal M.; Marroni, Michele; Pandolfi, Luca; Ruffini, Leonardo; Ellero, Alessandro; Ottria, Giuseppe; Sayıt, Kaan (2016-01-01)
We present the first detailed geological map of the tectonic units documented in the easternmost branch of the Intra-Pontide suture (IPS) zone in the Tosya-Kastamonu area (Northern Turkey). The Main Map is at 1:50,000 scale and covers an area of about 350 km(2). It derived from 1:25,000 scale classic field mapping and represents a detailed overview of the complexities documented in the IPS zone, a tectonic nappe stack originating from the closure of the Intra-Pontide Oceanic basin and the subsequent collisi...
Citation Formats
E. Bozkurt and M. Satir, “The Cele mafic complex: Evidence for Triassic collision between the Sakarya and Istanbul Zones, NW Turkey,” TECTONOPHYSICS, pp. 198–214, 2013, Accessed: 00, 2020. [Online]. Available: