SOME NEOTECTONIC FEATURES OF AROUND THE LAKE EGIRDIR, TURKEY

Lake Egirdir is located transition of Western and Central Anatolia and north of Isparta Angle in the lakes region. Lake Egirdir is a result of a tectonic formation. However, during and after its development, -which still continues - not only tectonic processes but also other physical factors (such as weathering and erosion) have played important roles. It has been developed by the Isparta Angle, in the western Taurus Mountains, which is a large tectonic structure with the shape of a triangle, with Lake Egirdir in the north, and Fethiye Bay and Manavgat at its southern corners. The Neotectonic Period was started after Middle Miocene in the area and vicinity. The area was under approximately N-S compressional tectonic regime during the Middle Miocene. These stresses caused conjugate left and right lateral slip faulting in the west and east of Isparta Angle. Lake Egirdir was formed at junction of these faults at north. These N-S trending tensional fractures has been transformed normal faults. The area between these normal faults has became lake basin by the subsidence of the area. Kasikara graben at North and Kovada graben at south in the region have been developed by the N-S trending tensional fractures. On the other hand, following this formation in the area, lacustrine sediments with a different lithologies were deposited at the basins. During the Neotectonic Period after Upper Miocene, Central Anatolia was started to move westward. But, the Isparta angle was played an important role in prevention of this motion. As a result, Western Anatolia started to move in a SW direction along with Fethiye-Burdur Fault zone, relative to Central Anatolia. At the same time, Central Anatolia started to compress the east side of Isparta Angle.