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

Turkish Journal of Earth Sciences

article

ZABCI, CENGİZ¹  SANÇAR, TAYLAN²  TIKHOMIROV, DMITRY³  IVY-OCHS, SUSAN⁵  VOCKENHUBER, CHRISTOF⁵  FRIEDRICH, ANKE M.⁶  YAZICI, MÜGE¹  AKÇAR, NAKݳ 

[1] Department of Geological Engineering, Faculty of Mines, İstanbul Technical University;Department of Geography, Munzur University;Institute of Geological Sciences, University of Bern;Department of Geography, University of Zurich;Laboratory of Ion Beam Physics;Department of Earth and Environmental Sciences, Ludwig Maximilian University of Munich;Helmholtz Center Potsdam GFZ German Georesearch Center

关键词: Collision;    strike-slip faults;    slip rate;    Anatolia;    earthquake;   

DOI  :  10.55730/1300-0985.1849

学科分类：地球科学(综合)

来源: Scientific and Technical Research Council of Turkey - TUBITAK

【 摘 要 】

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 cosmogenic 36Cl 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 36Cl 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.

【 授权许可】

Unknown