Internal deformation of continental blocks within converging plates: insights from the Ovacık Fault (Anatolia, Türkiye)

Cengiz Zabci*, Taylan Sançar, Dmitry Tikhomirov, Susan Ivy-Ochs, Christof Vockenhuber, Anke M. Friedrich, Müge Yazici, Naki Akçar

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Araştırma sonucu: ???type-name???Makalebilirkişi

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The active tectonics of Anatolia is mostly characterized by its westward motion with respect to Eurasia between the Hellenic subduction in the west and Arabia-Eurasia continental collision in the east. Although most of the deformation is suggested to be confined along Anatolia’s boundary elements, viz. the North and East Anatolian shear zones, recent studies indicate a higher magnitude of internal strain accumulation, especially along the parallel/subparallel strike-slip faults of its central province. We present the first morphochronology-based slip rate estimate for one of these strike-slip structures, the Ovacık Fault, by using cosmogenic36Cl dating of offset fluvial deposits. At the Köseler Site (39.3643°N, 39.1688°E), two faulted risers, bounding the alluvial fan with its subplanar surface (NF1/NF1’) and the inset terrace tread (NF1/T2), are offset 19–24 and 15–22 m, respectively. The scattered surface ages and variability of 36 Cl concentrations in depth profiles suggest strong evidence for inheritance in alluvial fan and terrace deposits; thus, we used modelled depth-profile ages for both surfaces. The modelled ages 8–10 ka for NF1 and 6–8 ka for T2 yield slip-rate estimates 2.4 +0.5/–0.4 mm/a and 2.8 +0.7/–0.7 mm/a, respectively, for the upper-tread reconstruction of the NF1/NF1’and the lower-tread reconstruction of the NF1/T2. Our results together with previous slip-rate estimates for other structures show a significant internal deformation for Anatolia, especially along its subparallel strike-slip faults. These secondary faults slice Anatolia into several pieces giving rise to the formation of the Malatya-Erzincan, Cappadocian, and Central Anatolian slices, where the geometry is strongly controlled by the distribution of the Tethyan accretionary complexes.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)351-379
Sayfa sayısı29
DergiTurkish Journal of Earth Sciences
Basın numarasıSI-3
Yayın durumuYayınlandı - 2023

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This study was funded by the TÜBİTAK grant no. 114Y227 and İTÜ BAP project no. MAB-2017-40586. The first author was also supported by Deutscher Akademischer Austauschdienst (DAAD) with the research grant no. 57214227. The stereoscopic aerial photos were supplied by the General Directorate of Mapping. We are thankful to the Ovacık Municipality and people of Ovacık for their great support during our field studies. Sinem Hacıosmanoğlu helped in input of some field and remote sensing data to the Geographical Information System while Alican Aktağ participated in our field studies. We thank Boris A. Natal’in for discussions on tectonics of Anatolia. Critics of Volkan Karabacak and an anonymous reviewer significantly increased the quality of this article. Some figures were made by using the Generic Mapping Tools (Wessel et al., 2013).

FinansörlerFinansör numarası
Boris A. Natal
Ovacık Municipality
Deutscher Akademischer Austauschdienst France57214227
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu114Y227, MAB-2017-40586

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