HR: 0800h
AN: T51C-1355    [Abstracts]
TI: Active Fault Pattern and Kinematics in the Northwest Anatolia: From Strike Slip Deformation to Extensional Tectonic Regime
AU: * Dogan, A
EM: dogan@mta.gov.tr
AF: MTA, Mineral Research and Exploration of Turkey, Geol. Res. Dept., Ankara, 06520 Turkey
AB: NW Anatolia is a transition region between North Anatolian Transform Fault System (NAFS) and Aegean Extensional Tectonic Regime. However, characteristics and regional pattern of the active faults provide data to understand regional present kinematics, which are poorly known. The NW Anatolia is deformed under the complex tectonic regime that bounded by NAFS in the north and Sindirgi-Sincanli Fault zone in the south. Complex active fault systems form large bends or arcs concave to south roughly parallel to Gediz and Dinar graben systems that take place between those major tectonic structures. In the Marmara region, the NAF turns into a large deformation zone and bifurcates into two main strands as the northern and southern. Recent GPS data reveal that the northern strand is the plate boundary and this strand essentially accommodates lateral motion along the NAF. However, southern strand is included in the complex fault systems in the Southern Marmara and Biga peninsula. Active faults in NW Anatolia form major bend systems generally trend E-W. The faults on the both flanks of the bends are right lateral strike slip faults and at the apex of the bends in the west NE-SW trending faults have reverse or thrust component, whereas in the east NW-SE trending faults have normal component. The region was divided into sub-blocks under the neotectonic regime. The cores of those are formed from paleotectonic massifs and active fault systems mostly have been were developed as a result of the reactivitation of paleo-tectonic structures around the massifs like Uludag, Kazdag, Muratdag, etc. Bursa bend is connected with right lateral Eskihehir-Tuz Golu fault system trending NW which is easternmost boundary of Aegean extensional tectonic regime within the Central Anatolia. Right lateral Sindirgi-Sincanli zone extends Sultandagy and Soma normal fault systems that separate the Aegean grabens from the NW Anatolia. All of cross faults on the hanging wall block of the Gediz detachment fault terminate at this zone. We concluded that; 1) The NW Anatolia is deformed under the complex tectonic regime between NAF and Aegean graben systems as a transition region. 2) Right lateral active faults are dominant structures within the regional kinematics and fault systems form arc patterns concave to south 3) Active faults in the southern Marmara and Biga Peninsula can not be directly evaluated within the NAFS as the identified in previous studies. Contrary, those fault systems reach within the Anatolian block towards to east via bends. 4) Active fault pattern in the region was mostly developed on the paleo-tectonic structures. 5) Anti-clockwise rotation on the Western Anatolia that consequence of escape tectonic regime of Turkey, is accommodated by regional active fault pattern.
DE: 8107 Continental neotectonics (8002)
DE: 8111 Continental tectonics: strike-slip and transform
SC: Tectonophysics [T]
MN: Fall Meeting 2005