Funda AKGÜN, Fuzuli YAĞMURLU, M. Serkan AKKİRAZ, Ezher TOKER, Sefer ÖRÇEN

3211

Sedimentary properties of the Middle−Upper Eocene Formations in Çardak, Burdur and İncesu, SW Turkey

GB Anadolu’da, Orta–Geç Eosen boyunca Çardak-Dazkırı ve Isparta arasında yüzlek veren üç farklı istifin paleoortamları, sedimantolojik, palinolojik ve paleontolojik verilerinin bütünlüğü ile daha iyi anlaşılabilmektedir. Bu çalışmada, Çardak-Dazkırı (Başçeşme Formasyonu), Burdur (Varsakyayla Formasyonu) ve Isparta (Kayıköy Fomasyonu) alanlarına ait birimlerin fasiyes ve fasiyes ilişkileri çalışılmıştır. Çalışma alanına ait tüm istifler, alüvyal yelpaze, yelpaze deltası, şelf ve denizel ortamı yansıtmaktadır. Ayrınıtlı yapılan arazi gözlemlerine göre, 34 litofasiyes ve 10 fasiyes birliği tanımlanmıştır. Başçeşme ve Varsakyayla formasyonlarında bulunan palinomorf birliği, biyostatigrafik önemi olan Aglaoreidia cyclops, Triatriopollenites excelsus, Plicatopollis lunatus, Subtriporopollenites constans and Subtriporopollenites anulatus ssp. nanus, ve mangrov ve mangrove-gerisi ortamı karakterize eden Psilatricolporites crassus ve Spinizoncolpites sp. ile temsil edilir. Genellikle resif gelişiminin yaygın olarak görüldüğü Başçeşme ve Varsakyayla formasyonlarının üst kesimleri, zengin ve çeşitli orthophragmines (Discocyclina sp.), nummulitids (Nummulites sp., Assilina sp., Heterostegina sp., Operculina sp.) and diğer bentik foraminifer grupları (Halkyardia sp., Fabiania sp., Asterigerina sp., and Sphaerogypsina sp.) içermektedir. SBZ 18-20 (SBZ 18-20) sığ bentik zonlarını temsil eden bu topluluklar, denizel ortam değişikliklerini anlamada önemli bir araçtır. Kayıköy Formasyonu foraminifer açısından çok fakir olduğundan dolayı ayrıntılı olarak yaşlandırılamamıştır. Ancak, planktik foraminiferlerden Globigerinidae içermesi, birimin açık şelf ortamında çökeldiğini göstermektedir. Diğer taraftan Kayıköy Formasyonuna ait istifin başlıca kumtaşı-şeyl ardalanmasından oluşan kırıntılı tortul bileşimi ve içerdiği tortul yapılar, türbidit akıntıların geliştiği denizel ortamı yansıtması bakımından önemlidir. Bartonian–Priabonian yaşlı bu üç formasyona ait tortul istiflerin yanal ve düşey yönde gösterdikleri litofasiyes değişimleri, GB-Anadolu’da Geç Eosen dönemi boyunca batıdan doğuya doğru bir transgresyonun geliştiğini yansıtmaktadır.

Çardak, Burdur ve İncesu Havzalarında Orta−Üst Eosen birimlerinin sedimanter özellikleri, GB Türkiye

The integration of sedimentological, palynological and palaeontological data in three different outcrops in SW Turkey provides a clearer understanding of the palaeoenvironments in an area between the Çardak-Dazkırı Basin and the Isparta region during the Middle–Late Eocene. In this study, the Çardak-Dazkırı (Başçeşme Formation), Burdur (Varsakyayla Formation) and Isparta (Kayıköy Formation) areas have been studied for facies and facies associations. These formations contain alluvial fan, fan delta, shelf and related marine deposits. Detailed field observations allowed 34 lithofacies and 10 facies associations to be identified. The palynomorph assemblages in the Başçeşme and Varsakyayla formations contain biostratigraphically important taxa such as Aglaoreidia cyclops, Triatriopollenites excelsus, Plicatopollis lunatus, Subtriporopollenites constans and Subtriporopollenites anulatus ssp. nanus. The mangrove and back mangrove elements such as Psilatricolporites crassus and Spinizoncolpites sp. also occur in these palynomorph assemblages. The upper parts of the Başçeşme and Varsakyayla formations, which oft en exhibit reef developments, contain an assemblage of orthophragmines (Discocyclina sp.), nummulitids (Nummulites sp., Assilina sp., Heterostegina sp., Operculina sp.) and other benthic taxa (Halkyardia sp., Fabiania sp., Asterigerina sp., and Sphaerogypsina sp.). These assemblages indicate shallow benthic zones 18-20 (SBZ 18-20). The absence of foraminifera in the Kayıköy Formation does not allow a precise age of the unit to be determined. However, the occurrence of some planktonic foraminifera (Globigerinidae) and the presence of clastic sediments suggest a marine environment with turbidity currents. The lateral and vertical relations of the Başçeşme, Varsakyayla and Kayıköy formations suggest a marine transgression from west to east in SW Anatolia during the late Middle Eocene–Late Eocene.
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Turkish Journal of Earth Sciences-Cover
  • ISSN: 1300-0985
  • Yayın Aralığı: Yılda 6 Sayı
  • Yayıncı: TÜBİTAK
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