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    Interactions between Eurasian/African and Arabian plates: Eskisehir Fault, NW Turkey
    (Pergamon-Elsevier Science Ltd, 2015) Özden, Süha; Gundogdu, Erdem; Bekler, Tolga
    The Eskisehir Fault is an active right-lateral widespread intra-continental deformation zone which separates central western Anatolia from the Aegean domain. The inversion of fault slip vectors along the Eski ehir Fault yields a strike-slip stress state with NW-trending sigma(Hmax) (sigma(1)) and NE-trending sigma(Hmin) (sigma(3)) axes since the Early Pliocene. A change in strike-slip faulting under a compressional stress regime: from old transpression to young transtension, probably occurred in the Quaternary. The inversion of the earthquake source mechanism indicates that the transtensional stress regime continues up to the present. The Intinil and Eski ehir Basins developed under the transtensional stress regime producing consistent and local normal faulting with a continuing NE-trending sigma(Hmin) (sigma(3)). The stress regime change resulted in a decrease in sigma(Hmax) (sigma(1)) and/or an increase in sigma(Hmin) (sigma(3)) stress magnitudes due to coeval influence of the superimposed plate forces and the interaction of three plates (Eurasian/African/Arabian): (1) continental collision of Eurasian/Arabian plates with Anatolian block in the east, (2) westward escape of the Anatolian block by anticlockwise rotation at the west-southwest border of the Eurasian and Arabian/African plates and (3) a complex subduction process between African and Eurasian plates along the Aegean (Hellenic) and the Cyprus arcs which favors western extrusion of the Anatolian block in the eastern Mediterranean region. (C) 2015 Elsevier Ltd. All rights reserved.
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    Late Cenozoic Geodynamic Evolution of Simav (Kutahya) and Surroundings
    (Tmmob Jeoloji Muhendisleri Odasi, 2015) Gundogdu, Erdem; Özden, Süha; Gungor, Talip
    The Late Cenozoic geodynamic evolution of Simav (Kutahya) and surroundings was determined by dating active tectonic structures in the region (Simav Fault and Simav Detachment Fault) and granitic and volcanic rocks of the Egrigoz Magmatic Complex. Additionally it was revealed that the currently normal Simav Fault, in previous periods acted as a strike-slip fault according to dating studies of fault planes and field observations. Dating of the fault planes along the Simav Fault determined that initiation of the Simav Fault occurred in the interval between 19.3-26.1 Ma. In this period the Simav Fault demonstrated strike-slip fault behavior in a compressional regime. The results of dating studies of the Egrigoz and Koyunoba Plutons (21.9-26.3 Ma) reveal that the unroofing of these plutons was related to the Simav Detachment Fault (20.0-27.4 Ma). Additionally the presence of volcanism in the time period was identified (7.1-21.3 Ma). The Simav Fault which displayed previous strike-slip character currently has listric normal fault behavior after a tectonic regime change in the Plio-Quaternary. The transition from extensional-compressional regime to a regional extensional regime and cause of the tectonic regime change is thought to be related to the complex subduction process (slab-pull and and roll-back) between the African Plate and Anatolian Plate in the Eastern Mediterranean.