M. Cemal GÖNCÜOĞLU, Necati TURHAN, Kiyoko KUWAHARA, U. Kağan TEKİN

Upper Permian (Changxingian) radiolarian cherts within the clastic successions of the Karakaya Complex in NW Anatolia

Geyve güneyinde, "Karakaya Kompleksi" içinde yaygın olarak yüzeylenen olistostomlu arkozik kumtaşı birimi içerisinde ince bir radyolaryalı çört tabakası yüzeylemektedir. Bu çörtlerden alınan örnek, içerdiği Albaillellid'lere göre Neoalbaillella ornithoformis Topluluk Zonu ile korele edilmekte ve Geç Permiyenin Çangzingiyen yaşını vermektedir. Karakaya birimleri içerisinde ilk kez belirlenen bu sinsedimanter oluşuk, Karakaya baseninin en geç Permiyen'de Orta Sakarya Kompozit Birliği'nin Midiyen Platformu ve Permiyen öncesi temeli üzerinde riftleşme ile açıldığını göstermektedir.

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