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 A., Ottria G., Marroni M., Pandolfi L., GÖNCÜOĞLU M. C.

JOURNAL OF STRUCTURAL GEOLOGY, cilt.72, ss.124-141, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 72
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.jsg.2014.12.003
  • Dergi Adı: JOURNAL OF STRUCTURAL GEOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.124-141
  • Anahtar Kelimeler: North Anatolian Fault, Structural geology, Kinematic analysis, Transpression, Turkey, FAULT-ZONE, TECTONIC EVOLUTION, ACTIVE TECTONICS, WESTERN PONTIDES, MARMARA SEA, PLATE, EAST, SYSTEM, REGION, BASIN
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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 Riedel theoretical model. Nevertheless, the strain partitioning is more complicated than predicted by theory. The structural analysis suggests a polyphase deformation characterized by a steady component of transcurrence associated with alternance of compression and extension. Along each of theoretical directions the combination of double verging structures can be observed, with folds and thrust surfaces root into high-angle shear zones, according to flower-type geometries. The discrepancies of directions, kinematics and geometries from theoretical models are due to transpressive and/or transtensive nature of the deformation. According to the observed outcropping structures, we propose a conceptual model for the North Anatolian Shear Zone, interpreting it as a crustal-scale positive flower structure. (C) 2014 Elsevier Ltd. All rights reserved.