Abstract
Three different deformation phases have been recognized in the southern part of the Çankırı Basin from (1) the major structures and (2) through using paleostress inversion techniques for fault slip data. The deformation phases recognized from the paleostress data are correlated with those recognized from the major structures and dated accordingly. The first phase occurred in the Late Paleocene to pre-Burdigalian and is characterized by an oblique σ2 and NNE–SSW to NE–SW trending subhorizontal σ1 and WNW–ESE to NW–SE trending σ3 patterns which indicate transcurrent deformation associated with a combination of thrusting and strike slip faulting (transpression) possibly due to indentation of the Kırşehir Block to the Sakarya Continent. The second phase occurred from the Burdigalian to the Serravallian and is characterized by a subvertical σ1 and oblique σ2 and σ3, which indicate oblique extension associated with normal faulting possibly due to a post-orogenic collapse. The third deformation phase is characterized by a vertical σ2 while the other stresses were horizontal, which indicate regional transcurrent tectonics, which is correlated with the current transcurrent tectonics controlled by the North Anatolian Fault Zone.
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