Sedimentation in the Late Miocene–Early Pliocene Alanya Bay, southwestern Türkiye


Nemec W., ÖZAKSOY V.

Mediterranean Geoscience Reviews, 2024 (Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1007/s42990-024-00136-4
  • Dergi Adı: Mediterranean Geoscience Reviews
  • Derginin Tarandığı İndeksler: Scopus, Geobase
  • Anahtar Kelimeler: Alanya Bay, Pliocene, Shoreface, Tempestites, Turkey
  • Akdeniz Üniversitesi Adresli: Evet

Özet

The name “Alanya Basin” pertains to a small outlier of the Manavgat Basin in southern Türkiye, inferred to be a palaeobay developed at the basin’s northeastern coastal margin. The sedimentary infill of the Alanya palaeobay may well be coeval with stratigraphic intervals of the Manavgat Basin’s sedimentary succession. The outcrops in the Alanya area are isolated, small, and relatively poor. Still, this study has indicated at least five transgressive–regressive sequences, each capped with the upper-shoreface sandstones and gravelly palaeobeach, extending over most of the palaeobay area. The well-sorted, shell-bearing shoreface sand was spread by storms into an offshore transition zone and deposited as tempestites intercalated with bioturbated mudstones. The succession is covered with tufa, possibly coeval with the well-known Antalya Tufas. In a monoclinal fashion, the deposits are tilted at ca. 20° towards the southwest, apparently due to the latest Neogene Aksu phase of regional tectonic compression. The palaeobay is not a fault-bounded basin and seems to be a simple shallow-marine extension of the main basin related to the rugged bedrock topography of the basin margin. In short, the coastal embayment and the deep-water domain may have a common history of sea-level changes. Therefore, the stratigraphic record of the Alanya Basin may shed light on the Neogene sea-level conditions in the Manavgat Basin. Notably, the Alanya area seems to be one of the few unique localities where the coastal deposits of the basin are preserved. Last but not least, it is worth pointing out that few ancient marine bays, particularly of this type (with negligible tidal influence and intense wave action), have ever been described in the literature.