Tectonostratigraphic evolution of the Upper Cretaceous-Cenozoic central Anatolian basins: an integrated study of diachronous ocean basin closure and continental collision


Nairn S. P. , Robertson A. H. F. , ÜNLÜGENÇ Ü. C. , Tasli K., Inan N.

7th International Symposium on Eastern Mediterranean Geology, Adana, Türkiye, 18 - 22 Ekim 2010, cilt.372, ss.343-384 identifier identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 372
  • Doi Numarası: 10.1144/sp372.9
  • Basıldığı Şehir: Adana
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.343-384

Özet

The Upper Cretaceous-Mid-Eocene Kirikkale, Tuz Golu, Haymana and Cankiri basins are bounded by the Pontide (Eurasian) continental margin to the north, the Nigde-Kirsehir micro-continent to the east and the Tauride- Anatolide continental unit to the south. The basins developed during northward subduction/collision of the Izmir-Ankara-Erzincan Ocean ('northern Neotethys') in the north and the inferred Inner Tauride Ocean in the south. Subduction of the Izmir-Ankara-Erzincan Ocean resulted in latest Cretaceous collision of the Nigde-Kirsehir microcontinent with the Pontide active margin and ophiolite emplacement. Some mid-ocean ridge-type oceanic crust remained to the SW and formed the basement of the Kirikkale and Tuz Golu basins. These basins are partially floored by an accretionary wedge to the west and by the Nigde-Kirsehir microcontinent to the east. Locally volcaniclastic, the sediment infill switched to terrigenous after latest Cretaceous. The Haymana Basin, further NW, developed as a forearc basin on the Mesozoic accretionary wedge and Pontide continental fragments. The Cankiri Basin also developed on an accretionary wedge, bounded by the Eurasian active margin to the north. An extensional setting prevailed during the latest Cretaceous related to subduction of remnant oceanic crust, followed by a switch to regional compression during Late Paleocene-Mid Eocene progressive and diachronous collision.