Sedimentary development of the Oligocene Karsanti Basin, southern Turkey, in its regional tectonic setting


ÜNLÜGENÇ Ü. C. , AKINCI A. C.

JOURNAL OF ASIAN EARTH SCIENCES, cilt.105, ss.173-191, 2015 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 105
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.jseaes.2015.03.034
  • Dergi Adı: JOURNAL OF ASIAN EARTH SCIENCES
  • Sayfa Sayıları: ss.173-191

Özet

Following Late Cretaceous ophiolite and melange emplacement on the Tauride belt several Neogene sedimentary basins of variable size were formed along the southern flank of the Taurus continent in southern Turkey. These include the Pozantı and Karsantı Basins and the regional scale Çukurova Basin Complex, extending southwestward into the Cilicia-Kyrenia Basin. The Karsantı Basin is bounded by the regional scale sinistral Ecemiş Fault Zone to the west, the East Anatolian Fault Zone to the southeast and the Negoene Adana Basin to the south. Deformed Palaeozoic and Mesozoic rock units that display an irregular palaeotopography form the basement of the Karsantı Basin. These units are overlain by an allochthonous Kızıldağ melange and by thrust slices of basic/ultrabasic ophiolitic rocks (Faraşa ophiolites), emplaced in this region during the Late Maastrichtian. The Karsantı basin was formed during Oligocene on top of these allocthonous thrust sheets. The Karsantı Basin deposits disconformably overlies the ophiolitic nappes and evidently represent a N-S extending half graben setting which is probably most active after the deposition of lacustrine sediments due to progressive tectonic effects and subsidence in the late Oligocene. The main Karsantı Basin?fill sequence is represented by four lithological units, characterised by highly variable facies namely “alluvial fan deposit” (A1), “shallow marine sediments” (A2), “lacustrine sediments” (A3), and “fluvial deposits” (A4). These sediments were deposited during the Oligocene, prior to the initiation of the main Adana Basin, which formed in a separate intermontane setting. The Karsantı Basin fill is unconformably overlain by early Miocene sediments of the Neogene Adana basin.