Palaeomagnetically defined rotations of fault-bounded continental blocks in the North Anatolian Shear Zone,North Central Anatolia |
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| Institution: | 1. Instituto de Geofísica, UNAM, Unidad Michoacán, Campus Morelia, Laboratorio Interinstitucional de Magnetismo Natural (LIMNA), Mexico;2. Unidad Académica de Antropología, Universidad Autónoma de Zacatecas, Mexico;3. El Colegio de Michoacán A.C., Extensión La Piedad, La Piedad, Michoacán C.P. 59370, Mexico;4. Escuela Nacional de Estudios Superiores (ENES), Unidad Morelia, UNAM Campus Morelia, Michoacán, Mexico;1. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma, Italy;2. Dipartimento di Scienze della Terra, dell''Ambiente e delle Risorse, Università di Napoli Federico II, Largo San Marcellino 10, 80138 Napoli, Italy;1. TU Bergakademie Freiberg, Institute of Geophysics and Geoinformatics, Freiberg, Germany;2. GFZ Helmholtz Centre Potsdam, German Research Centre for Geosciences, Telegrafenberg, Potsdam, Germany |
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| Abstract: | The 1200 km-long North Anatolian Transform Fault connects the East Anatolian post-collisional compressional regime in the east with the Aegean back-arc extensional regime to the west. This active dextral fault system lies within a shear zone reaching up to 100 km in width, and consists of southward splining branches. These branches, which have less frequent and smaller magnitude earthquake activity compare to the major transform, cut and divide the shear zone into fault delimited blocks. Comparison of palaeomagnetic data from 46 sites in the Eocene volcanics from different blocks indicate that each fault-bounded block has been affected by vertical block rotations. Although clockwise rotations are dominant as expected from dextral fault-bounded blocks, anticlockwise rotations have also been documented. These anticlockwise rotations are interpreted as due to anticlockwise rotation of the Anatolian Block, as indicated by GPS measurements, and the effects of unmapped faults or pre-North Anatolian Fault tectonic events. |
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