Geology and tectonic evolution of the Biga Peninsula, northwest Turkey

Okay A., Siyako M., Burkan K.

Bulletin - Technical University of Istanbul, vol.44, pp.191-256, 1991 (Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 44
  • Publication Date: 1991
  • Journal Name: Bulletin - Technical University of Istanbul
  • Journal Indexes: Scopus
  • Page Numbers: pp.191-256
  • Istanbul Technical University Affiliated: Yes


Four NE-SW trending zones are recognised in the Biga and Gelibolu peninsulas, which are from NW to SE: the Gelibolu, the Ezine, the Ayvacik-Karabiga and the Sakarya zones. The Gelibolu and the Ayvacik-Karabiga zone are made up of an Upper Cretaceous/Paleocene ophiolitic melange called the Cetmi Ophiolitic Melange. The Ezine Zone consists of a slightly metamorphosed epicontental Permo-Carboniferous sedimentary sequence that is tectonically overlain by a Permo-Triassic ophiolite, both are in fault contact with high-grade metasedimentary rocks. The Sakarya Zone is made up of the Triassic Karakaya Complex overlain unconformably by the Jurassic-Cretaceous sedimentary rocks. In the west, the gneisses, amphibolites and marbles of the Kazdag Group occur tectonically below the Karakaya Complex while in the east low grade metamorphic rocks intruded by a granite form the stratigraphic basement to one of the Karakaya units (the Hodul Unit). Four tectonostratigraphic units are distinguished in the Karakaya Complex. -from Authors