Ortaköy-Barcın Yaylası (Orta Toroslar, Antalya Napları, Gündoğmuş) Kretase istifinin stratigrafisi, bentik foraminiferleri ve paleo-ortamsal yorumu

Ortaköy-Barcın Yaylası Kretase istifi, Gündoğmuş’un (Antalya) kuzeyinde Akseki-Güzelsu-Köprülü boyunca yüzlek veren Antalya napları içerisinde yer alır. İstif, başlıca Pseudonummoloculina aurigerica, Praechrysalidina infracretacea, Nezzazata isabellae, Trochamminoides coronus, Glomospira urgoniana, Vercorsella arenata, Cuneolina parva türlerini içeren Albiyen kireçtaşları ile başlar ve Sellialveolina viallii, Ovalveolina maccagnoae, Biplanata peneropliformis, Pseudorhapydionina dubia, Pseudolituonella sp., Biconcava bentori, Merlingina cretacea, Chrysalidina gradata, Cuneolina pavonia, Coxites zubairensis türlerini içeren Senomaniyen kireçtaşları ile uyumlu olarak üzerlenir. Sıklıkla breşik seviyeler içeren Albiyen-Senomaniyen kireçtaşları sınırlı iç platformun kısa süreli su-üstü koşullara maruz kalan gel-git çevresi ortamlarını temsil eder ve baskın olarak fenestral/kuşgözlü çamurtaşı, fenestral/laminalı peloidal istiftaşı-tanetaşı ve foraminiferal vaketaşlarından oluşur. Albiyen-Senomaniyen iç platform istifini, başlıca Orbitoides apiculata, Orbitoides media-megaloformis, Lepidorbitoides sp., Siderolites cf. S. calcitrapoides, Omphalocyclus sp. türlerini içeren yamaç-havza ortamlarında çökelmiş Maastrihtiyen kireçtaşları uyumsuz olarak üzerler. Maastrihtiyen istifi, biyoklastik kireçtaşı ve çörtlü mikritik kireçtaşı-kalsitürbidit ardalanmasından oluşur. Bu litolojilerden biyoklastik kireçtaşı ve kalsitürbiditler, iri bentik foraminiferli biyoklastik istiftaşı-tanetaşı, çörtlü mikritik kireçtaşı ise planktonik foraminiferli pelajik vaketaşı özelliğindedir. Elde edilen veriler, uyumsuzluğu üzerleyen Maastrihtiyen yamaç-havza fasiyeslerinin tektonizmaya bağlı olarak hızlı bir platform çöküşü sonrasında geliştiğini ortaya koymaktadır.

Anahtar Kelimeler:

Kretase, stratigrafi, bentik foraminifer, karbonat fasiyesi, Antalya napları, Orta Toroslar

Stratigraphy, benthic foraminifera and paleoenvironmental interpretation of the Ortaköy-Barcın Plateau Cretaceous sequence (Central Taurides, Antalya Nappes, Gündoğmuş)

The Ortaköy-Barcın Plateau Cretaceous sequence is located in the Antalya nappes outcropping throughout the Akseki-Güzelsu-Köprülü which is in northern of the Gündoğmuş (Antalya). The sequence begins with Albian limestones containing mainly Pseudonummoloculina aurigerica, Praechrysalidina infracretacea, Nezzazata isabellae, Trochamminoides coronus, Glomospira urgoniana, Vercorsella arenata, Cuneolina parva and they are conformably overlain by the Cenomanian limestones including Sellialveolina viallii, Ovalveolina maccagnoae, Biplanata peneropliformis, Pseudorhapydionina dubia, Pseudolituonella sp., Biconcava bentori, Merlingina cretacea, Chrysalidina gradata, Cuneolina pavonia, Coxites zubairensis. The Albian-Cenomanian limestones that contain frequently breccia levels represent peritidal environments of restricted inner platform exposed to short-term subaerially. They are composed of dominantly fenestral/birdseye mudstone, fenestral/laminated peloidal packstone to grainstone, and foraminiferal wackestone. The Albian-Cenomanian inner platform sequence is disconformably overlain by the Maastrichtian limestones deposited in slope to basin, mainly containing Orbitoides media-megaloformis, Lepidorbitoides sp., Siderolites cf. S. calcitrapoides, Omphalocyclus sp. The Maastrichtian sequence is composed of bioclastic limestone and alternation of chert-bearing micritic limestone and calciturbidite. The bioclastic limestone and calciturbidite have the feature of bioclastic packstone to grainstone microfacies containing larger benthic foraminifera and the chert-bearing micritic limestones have the feature of pelagic wackestone microfacies including planktonic foraminifera. The data obtained reveal that the Maastrichtian slope to basin facies overlying the unconformity developed after a rapid subsidence of the platform due to tectonism.

Keywords:

Cretaceous, stratigraphy, benthic foraminifera, carbonate facies, Antalya nappes, Central Taurides,

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