Manavgat Alt Havzası'nda (GB Türkiye) Geç Pliyosen Aşınma Yüzeyi (LPES) üzerinde yer alan Alt Pleyistosen yaşlı paleotsunami tortullarının yeni nannofosil ve fosil ascidian spikül verilerine dayanan krono-biyostratigrafik çözümlemesi

Öz

Doğu Akdeniz kenar havzalarında yer alan Antalya Havzası'nın doğu kesimini oluşturan Manavgat Alt Havzası'ndaki Geç Pliyosen regresyonu ve erozyonu dönemi sonrasında oluşan bir aşınma yüzeyi tespit edilmiştir. Bu hiyatüs, olasılıkla Akdeniz'in tabanında meydana gelen ve kıyı düzlüğünde hızlı ve kısa süreli deniz taşkınlarına neden olan depremlerin sonucu oluşan Alt Pleistosen paleotsunami çökelleri tarafından örtülmektedir. 10 inceleme noktasından alınan kayaç örneklerinin sedimantolojik ve biyostratigrafik incelemesi, bu yeni hızlı transgresif istifin kanıtlarını sağlamıştır. Alt Pleyistosen paleotsunamit zonu bölgede, 2-3 m kalınlıkta uzanıma sahiptir. Çamurlu bir matris içinde kumdan blok boyutuna kadar değişen tanelerden oluşan kötü boylanmış kırıntılı çökellerden oluşur. Çamurlu matris, farklı ortamsal, sedimantolojik ve stratigrafik kökenleri temsil eden çeşitli makro ve mikro fosil verilerini içermektedir. Kumdan blok boyutuna kadar olan bileşenler, havza dışı sedimanter istiflerden yeniden çökeltilmiş farklı yaşta marn, kumtaşı, çakıltaşı ve kireçtaşı parçalarından ve havza içinden taşınan çökelimle eşyaşlı resif bloğu veya kayaç parçalarından oluşur. Tespit edilen kalkerli nannofosil verileri, Miyosen yaşlı olarak bilinen Karpuzçay Formasyonu'nda iki farklı yaşta tortul istifi ortaya çıkarmıştır: (1) Altta Erken Pliyosen yaşlı kırıntılı şelf çökelleri "Karpuzçay Formasyonu" ve (2) "Manavgat Formasyonu Tsunami Üyesi"nin paleotsunami çökelleriyle başlayan sığ denizel ve kıyısal kırıntılı çökelleri içeren, Erken Pleyistosen yaşlı "Manavgat Formasyonu". Karpuzçay Formasyonunun mavi-gri marnları, NN15 - Reticulofenestra pseudoumbilica zonunun (geç Erken Pliyosen) %45-60 oranında çökelimle eşyaşlı nannofosil topluluğuna sahiptir, Manavgat Formasyonunun gri-kahverengi çamurtaşları ise NN19a - Gephyrocapsa caribbeanica Astzonunun (Erken Pleistosen) %5-15 oranında çökelimle eşyaşlı nannofosil verilerini içerir. Manavgat Formasyonu Tsunami Üyesi tortullarına ait nannofosil verileri, tsunami olayının 1,81 My ile 1,60 My (Gelasian-Calabrian geçişi) arasında meydana geldiğini göstermektedir.

Anahtar Kelimeler

• Ascidian spikülü
• Erken Pleistosen
• Manavgat Alt-havzası
• nannofosil

Chrono-biostratigraphic analysis of the Lower Pleistocene paleotsunami deposits overlying the Late Pliocene Erosional Surface (LPES) at the Manavgat Subbasin (SW Türkiye) based on new nannofossil and fossil ascidian spicule data

Öz

In the Manavgat Subbasin, which is the eastern part of the Antalya Basin located at the Eastern Mediterranean marginal basins, an erosional surface that formed after the late Pliocene regression and erosion period was determined. This hiatus is overlain by Lower Pleistocene paleotsunami deposits that are probably the result of earthquakes below the Mediterranean that caused rapid and short-lived sea flooding of the coastal plain. Sedimentologic and biostratigraphic examination of rock samples, taken from 10 locations, provided evidences of this new regressive succession. The lower Pleistocene paleotsunamite zone extends in 2-3 m. thickness at the region. It consists of poorly sorted clastic sediments which are composed of sand to boulder-sized grains within a muddy matrix. The muddy matrix contains various macro- and microfossils data representing different environmental, sedimentological and stratigraphic origins. The sand to boulder components are composed of different aged marl, sandstone, conglomerate, and limestone fragments, which were reworked from extrabasinal sedimentary successions and coeval reef block or boulders that were removed from the intrabasin. Detected calcareous nannofossil data have brought out two different aged sedimentary sequences in the Karpuzçay Formation known as Miocene aged: (1) Early Pliocene aged clastic shelf deposits "Karpuzçay Formation" below and (2) Early Pleistocene aged "Manavgat Formation" contains shallow marine and coastal clastic deposits that begun with the paleotsunami deposits of "Manavgat Formation Tsunamite Member". The blue-grey marls of the Karpuzçay Formation have 45-60% synsedimentary nannofossil assemblage of NN15 - Reticulofenestra pseudoumbilica zone (late Early Pliocene), grey-brown mudstones of the Manavgat Formation include 5-15% synsedimentary nannofossil data NN19a - Gephyrocapsa caribbeanica subzone (Early Pleistocene). The nannofossil data of Manavgat Formation Tsunami Member deposits suggest that the tsunami event occurred between 1.81 Ma and 1,60Ma (Gelasian-Calabrian transition).

Anahtar Kelimeler

• Ascidian spicule
• Early Pleistocene
• Manavgat subbasin
• nannofossil
• tsunami deposits

Kaynakça

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