Mesoscopic and Microscopic Observations on the Character of Koyunbaba Fault Between Koyunbaba and Hasayaz in the Western Part of Cankin Basin and Their Implications on the Regional Tectonic Models

Onal Z., IŞIK V., SEYİTOĞLU G.

TURKIYE JEOLOJI BULTENI-GEOLOGICAL BULLETIN OF TURKEY, sa.3, ss.1-12, 2006 (ESCI) identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2006
  • Dergi Adı: TURKIYE JEOLOJI BULTENI-GEOLOGICAL BULLETIN OF TURKEY
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.1-12
  • Ankara Üniversitesi Adresli: Evet

Özet

The Koyunbaba fault is located on the western margin of Cankin basin (Central Anatolia) where the neotectonic evolution is debated. The fault is located between Early-Middle Miocene Hancili formation of Cankin basin and the ophiolitic rocks of Neo-Tethyan suture zone. The type of the Koyunbaba fault, however, is interpreted differently in some studies. The Koyunbaba fault has variably sized slickensides with well-developed slickenlines. The fault comprises NW-SE trending fault planes dipping between 25-40 degrees to the SW. Slickenlines trend NE-SW with plunging SW. The surface displays undulations with centimeters to meters wavelength. Slickenlines and undulation axes are parallel to each other. Cataclastic zone that occurred in the footwall block of the Koyunbaba fault is characterized by breccias and cataclasites. The zone includes mesoscopic and microscopic brittle kinematic indicators (tension gashes, inclined planar structures, asymmetric deformed elements, Riedel fractures) indicating that hanging wall moved to southwest and Koyunbaba fault is a normal fault. This finding supports the existence of a tectonic sliver having normal and thrust faults on the western and eastern margins respectively.