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Geological Magazine; May 2003; v. 140; no. 3; p. 343-355; DOI: 10.1017/S001675680300757X
© 2003 Cambridge University Press (CUP)
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Article

Palaeomagnetic evolution of the Çankiri Basin (central Anatolia, Turkey): implications for oroclinal bending due to indentation

NURETDIN KAYMAKCI*,*, CHARON E. DUERMEIJER{dagger}, COR LANGEREIS{dagger}, STANLEY H. WHITE{dagger} and PAUL M. VAN DIJK{ddagger}

* Middle East Technical University, Faculty of Engineering, Dept. of Geological Engineering, 06531-Ankara, Turkey
{dagger} Faculty of Earth Sciences, Utrecht University, Budapestlaan 17, 3584 CD Utrecht, The Netherlands
{ddagger} ITC, Hengelosestr 99, P.O. Box 6, 7500 AA Enschede, The Netherlands

* Author for correspondence: nkaymakci{at}yahoo.com

Palaeomagnetic data in combination with palaeostress data and anisotropy of magnetic susceptibility orientations are utilized to develop a tectonic evolutionary model for the Early Tertiary part of the {Omega}(omega)-shaped Çankiri Basin (Turkey). The results reveal clockwise rotations in the northeast and anticlockwise rotations in the west and southeastern corner of the basin. The magnetic inclinations indicate a northward drift of the Çankiri Basin and support an indentation model for the Kirsehir Block. It is proposed that the {Omega}-shape of the Çankiri Basin was the result of indentation of the Kirsehir Block into the Sakarya Continent during northwards migration accompanying closure of Neotethys. It appears that the indentation started prior to Eocene and ended before Middle Miocene times.

Key Words: tectonics • palaeomagnetism • magnetic declination • stress • Turkey • oroclines




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