HR: 17:00h
AN: T24C-05    [Abstracts]
TI: Structural Evolution of the Central Menderes Metamorphic Core Complex, Western Anatolia, Turkey
AU: * Cemen, I
EM: icemen@okstate.edu
AF: Oklahoma State University, School of Geology, Stillwater, OK 74078
AU: Catlos, E J
EM: catlos@okstate.edu
AF: Oklahoma State University, School of Geology, Stillwater, OK 74078
AU: Gogus, O
EM: gogus@geology.utoronto.ca
AF: University of Toronto, Department of Geology, Toronto, M5S 3B1 Canada
AU: Sahai, S K
EM: sksahai@okstate.edu
AF: Oklahoma State University, School of Geology, Stillwater, OK 74078
AB: The Central Menderes Metamorphic Core Complex is located within the Western Anatolia Extended Terrane. It is bounded by two low-angle Detachment surfaces; the north-dipping Alasehir (Kuzey) Detachment to the north and the south-dipping Buyuk Menderes Detachment to the south. The north-dipping Alasehir Detachment surface contains top-to-N-NE shear sense indicators overprinted by top-to-north brittle shear sense indicators. It also contains a well developed Turtleback fault surface similar in its geometry to the Death Valley Turtleback surfaces in southwestern Basins and Ranges. The south-dipping Buyuk Menderes Detachment surface contains top-to-north ductile shear-sense indicators. These structural features were overprinted by top-to-south ductile shear sense indicators, which were in turn overprinted by britlely deformed top-to-south kinematic indicators. Based on our field observations, interpretation of available seismic reflection profiles and radiometric age determinations, including our limited number of monazite ages, we suggest that the northward movement along the Alasehir and Buyuk Menderes Detachment surfaces were initiated in Late Oligocene along a large continental-scale N-dipping main breakaway fault. We propose that the main breakaway fault is located on the south side of Gokova Gulf and extension may have started with a simple shear zone at depth. The high grade metamorphic rocks of the Central Menderes Metamorphic Core Complex were brought close to the surface due to extensional unroofing of the upper plate rocks of this main breakaway. The Alasehir Detachment was formed in Early Miocene as the secondary breakaway. The southward movement along the Buyuk Menderes Detachment was also initiated in Early Miocene.
DE: 8011 Kinematics of crustal and mantle deformation
DE: 8031 Rheology: crust and lithosphere (8159)
DE: 8107 Continental neotectonics (8002)
DE: 8109 Continental tectonics: extensional (0905)
SC: Tectonophysics [T]
MN: Fall Meeting 2005