Akademik Veri Yönetim Sistemi
World Multidisciplinary Earth Sciences Symposium WMESS, Praha, Çek Cumhuriyeti, 7 - 11 Eylül 2015
The North Anatolian Fault Zone (NAFZ) bifurcates into three branches in the Marmara Region which is a transition zone between the strike-slip tectonics manifested by the NAFZ and the N-S directed extensional regime of western Anatolia. The southern Marmara region is controlled by the middle and the southern branches while the northern branch dominate tectonic pattern the north Marmara region. Different deformation phases affecting southwest Marmara region were explained in four different phases: (a) The approximately NS compressional regime, which occurred during the Early-Middle Miocene. During this phase approximately NE-SW trending extensional faults formed, (b) The earlier phase of N-S extension, which occurred during Late Miocene-Early Pliocene as a new continental basin began to form, (c) A brief phase of cessation marked by the development of a regional flat-lying erosional surface, indicating that the N-S extension appears to be discontinuous, and finally (d) The later phase of N-S extension and E-W strike-slip, which has been affecting the region since possibly the latest Pliocene-Quaternary. The main structural features of the southwestern Marmara were controlled by the latest regime. The southwestern domain is characterized by two different groups, NE-SW striking oblique-slip faults and E-W striking normal faults. However, the southeast Marmara region is controlled by approximately E-W trending rhomb-like morphologic structures bounded by strike slipfaults with normal component, striking mainly in E-W direction. The fault zone trends approximately E-W between Mudanya and Bandırma. To the west of Bandırma, it bends counter-clockwise and follows an approximately WSW-ENE trend.