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
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 ophiolites produced in supra-subduction settings from the Late Triassic to the Early Cretaceous. Ophiolites preserved in the metamorphic units recorded pervasive deformations and peak metamorphic conditions ranging from blueschist to eclogite facies. In the nonmetamorphic units, the complete oceanic crust sequence is preserved in tectonic units or as olistoliths in sedimentary melanges. Geochemical, structural, metamorphic and geochronological investigations performed on ophiolite-bearing units allowed the formulation of a new geodynamic model of the entire "life" of the IntraPontide oceanic basin(s). The reconstruction starts with the opening of the Intra-Pontide oceanic basins during the Late Triassic between the Sakarya and Istanbul-Zonguldak continental microplates and ends with its closure caused by two different subductions events that occurred during the upper Early Jurassic and Middle Jurassic. The continental collision between the Sakarya continental microplate and the Eurasian margin developed from the upper Early Cretaceous to the Palaeocene. The presented reconstruction is an alternative model to explain the complex and articulate geodynamic evolution that characterizes the southern margin of Eurasia during the Mesozoic era.


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The Izmir Region is located in the heart of the Western Anatolian coastline and forms a natural bridge between the Anatolian mainland and the Western Aegean. The region is connected to Central Anatolia through deep valleys and is linked to the Aegean Sea via many harbor sites along the coast. The architectural features and the other remains (such as pottery, metal objects etc.) found in and around those architectural context can provide the information about the genesis of the urbanization. With reference t...
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...
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 ...
The Jurassic-Early Cretaceous basalt-chert association in the ophiolites of the Ankara Melange, east of Ankara, Turkey: age and geochemistry
Bortolotti, Valerio; Chiari, Marco; Göncüoğlu, Mehmet Cemal; Principi, Gianfranco; Saccani, Emilio; TEKİN, UĞUR KAĞAN; Tassinari, Renzo (2018-02-01)
This study is focused on slide blocks including oceanic lavas associated with pelagic sediments within the eastern part of the Ankara Melange. A detailed petrological characterization of the volcanic rocks and a detailed biochronological investigation of the associated radiolarian cherts in eight sections (east of Ankara) was carried out. The volcanic rocks are largely represented by basalts and minor ferrobasalts and trachytes. They show different geochemical affinities and overlapping ages including: (a) ...
Citation Formats
M. Marroni et al., “The Intra-Pontide ophiolites in Northern Turkey revisited: From birth to death of a Neotethyan oceanic domain,” GEOSCIENCE FRONTIERS, pp. 129–149, 2020, Accessed: 00, 2020. [Online]. Available: