Ordovician graptolites from the basal part of the Palaeozoic transgressive sequence in the Karadere area, Zonguldak Terrane, NW Turkey

Göncüoğlu, Mehmet Cemal
Gutierrez-Marco, Juan Carlos
The Karadere area to the east of Safranbolu in NW Anatolia is one of the very few localities in Turkey where the contact between the Cadomian basement and the Lower Palaeozoic transgressive succession is well exposed. The Ordovician graptolite Rhabdinopora flabelliformis (Eichwald) ssp. was found in the basal part of the Bakacak Formation, indicating an Early to early Late Tremadocian age for the beginning of the Palaeozoic transgression in the Zonguldak terrane. A few metres above this occurrence, another horizon contains Paradelograptus cf. antiquus (T. S. Hall), which mainly ranges into the Late Tremadocian. Higher up in the Ordovician succession, a new graptolite bed confirms an early Darriwilian (Dw1) age for the middle part of the Karadere Formation with the occurrence of the biozonal index Levisograptus austrodentatus (Harris & Keble) and the first record of Tetragraptus cor (Strandmark) in the area. The palaeobiogeographic distribution of these Karadere fossils is in agreement with a peri-Gondwanan affinity of the Zonguldak Terrane of the Pontides, NW Anatolia, during the Early-Middle Ordovician.


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Sachanski, Valeri; Göncüoğlu, Mehmet Cemal; Lakova, Iskra; Boncheva, Iliana; Demiray, Gulnur Saydam (2012-01-01)
The studied Guluc section of the Silurian Findikli Formation is situated on the western bank of Guluc Creek in Eregli, NW Anatolia, Turkey, in the eastern part of the Zonguldak Terrane. The Guluc section consists of 3 sedimentary packages: greenish grey limy siltstones, 5-7 m thick (1), overlain by an irregular alternation of black shales and clayey limestones, about 15 m thick (2), and a 6-7 m thick succession of mainly siltstones and sandy limestones (3). A combined biostratigraphy based upon graptolites,...
Tectonic evolution of the Cretaceous Ankara Ophiolitic Melange during the Late Cretaceous to pre-Miocene interval in Central Anatolia, Turkey
Rojay, Fuat Bora (2013-04-01)
The chaotic tectonic belt, which is distinguished in northern Anatolia, is called the - Ankara Accretionary Complex - in the Ankara region, central Anatolia. The belt is differentiated into three imbricated tectonic subbelts, namely, pre-Triassic metamorphics, Melange with calcareous blocks and Cretaceous melange with ophiolitic blocks (Ankara Ophiolitic Melange).
Analysis of the North Anatolian Shear Zone in Central Pontides (northern Turkey): Insight for geometries and kinematics of deformation structures in a transpressional zone
Ellero, Alessandro; Ottria, Giuseppe; Marroni, Michele; Pandolfi, Luca; Göncüoğlu, Mehmet Cemal (2015-03-01)
The western part of the North Anatolian Shear Zone at the southern boundary of the Central Pontides in Turkey, was investigated in the Kursunlu-Arac area by means of a geological-structural field study. In this area the North Anatolian Shear Zone results in a transpressional deformation zone that extends between two master faults striking parallel to the main shear direction. The main systems of structures identified in the deformation zone appear to be oriented parallel to the directions predicted by Riede...
Numerical Modeling of the 1939 Erzincan Earthquake
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Erzincan İli, Kuzey Anadolu Fay Hattı, Kuzey Doğu Anadolu Fay Hattı ve Ovacık Fayları arasında derin bir basen yapısı içerisinde yer almakta olup, dünyanın sismik aktivite açısından en yoğun bölgelerinden birisidir. Bölgenin sismotektonik ve jeolojik koşulları, 1939 (Ms~7.8) ve 1992 (Mw= 6.6) depremleri dahil olmak üzere bir çok tarihi ve aletsel dönem depremlerine sebep olmuştur. 1939 Erzincan depremi çok yıkıcı bir deprem olmakla birlikte, aletsel dönemden önceye denk geldiği için bu depreme ait kayıt bul...
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 ...
Citation Formats
M. C. Göncüoğlu, J. C. Gutierrez-Marco, and C. OKUYUCU, “Ordovician graptolites from the basal part of the Palaeozoic transgressive sequence in the Karadere area, Zonguldak Terrane, NW Turkey,” ESTONIAN JOURNAL OF EARTH SCIENCES, pp. 227–232, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30118.