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Late Miocene transcurrent tectonics in NW Turkey: evidence from palaeomagnetism and ⁴⁰Ar–³⁹Ar dating of alkaline volcanic rocks

N. KAYMAKCI^*,*, E. ALDANMAZ, C. LANGEREIS, T. L. SPELL, O. F. GURER and K. A. ZANETTI

^* RS/GIS lab. Department of Geological Engineering, Middle East Technical University, Ankara 06531, Turkey
Department of Geology, University of Kocaeli, Izmit 41040, Turkey
Faculty of Earth Sciences, Utrecht University, Budapestlaan 17, 3584 CD Utrecht, The Netherlands
Isotope Geochronology Laboratories, Dept. of Geosciences, University of Nevada, Las Vegas, NV 89154–4110, USA

^* Author for correspondence: kaymakci{at}metu.edu.tr

A number of intra-continental alkaline volcanic sequences in NW Turkey were emplaced along localized extensional gaps within dextral strike-slip fault zones prior to the initiation of the North Anatolian Fault Zone. This study presents new palaeomagnetic and ⁴⁰Ar–³⁹Ar geochronological results from the lava flows of NW Turkey as a contribution towards understanding the Neogene–Quaternary tectonic evolution of the region and possible roles of block rotations in the kinematic history of the region. ⁴⁰Ar–³⁹Ar analyses of basalt groundmass indicate that the major volume of alkaline lavas of NW Turkey spans about 4 million years of episodic volcanic activity. Palaeomagnetic results reveal clockwise rotations as high as 73° in Thrace and 33° anticlockwise rotations in the Biga Peninsula. Movement of some of the faults delimiting the areas of lava flows and the timing of volcanic eruptions are both older than the initiation age of the North Anatolian Fault Zone, implying that the region experienced transcurrent tectonics during Late Miocene to Pliocene times and that some of the presently active faults in the region are reactivated pre-existing structures.

Key Words: palaeomagnetism • block rotation • ⁴⁰Ar–³⁹Ar ages • alkaline volcanism • NW Turkey • strike-slip faulting • North Anatolian Fault Zone