NEO-TECTONIC FEATURES OF THE YAZIR FAULT (KONYA)

Abstract

The Yazır fault, located to the east of the Konya fault zone bordering west side of the Konya basin, is approximately 10 km in length and is formed by en echelon groupings of the sub-parallel fault sets. NNE-SSW trending Yazır fault cuts the Miocene-Pleistocene aged lacustrine rocks and Quaternary alluvial deposits of Konya basin. In the quarries opened between the Parsana and Yazır districts, the fault brought the lacustrine and Quaternary alluvial deposits side by side. Due to faulting, the lacustrine rocks were moved upwards relative to the alluvial deposits. The Yazır and Çiftlikbaşı faults formed a small triangular shaped graben structure in the area. Between the Parsana and Yazır districts, the fault surface is nearly vertical, and has NNE-SSW orientatiton. Although the slickenlines indicate that the fault has a small right hand strike slip movement, the fault mainly is a high angle east dipping normal fault. Surface data demonstrates that, due to this faulting, at least 25-30 m of vertical displacement was taken place in the area. Depending on the movements of the Yazır fault, two extensional sets of filled fissures were formed, one set is paralel to the main fault plane the other set erpendicular. These fissures are filled by alluvial deposits, and are triangular in shape closing downward. Their width range from 15 cm to 2 m, and their length reach up to 10 m, in vertical plane. The fissures have N10E, 90 and N80 W, 85 SW main orientation. Field observations indicate that these filled fissures were formed as surface cracks during movements of the Yazır fault at least twice. The orientations of these extensional cracks show that this part of the Konya plain was affected by east-west and north-south horizontally oriented tensional stresses.

Keywords

• Neo-tektonik, Konya fay zonu, Yazır fayı, Yarıklar, Yüzey kırığı