Ankara civarı (Beypazarı-Çayırhan) miyosen yaşlı gölsel-karasal çökellerin devirsel sedimantoloji, sekans stratigrafisi, ve sedimanter jeokimya yöntemleri ile yüksek çözünürlükte incelenmesi

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2009

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Stoica, Marius
Yılmaz, İsmail Ömer
Batı, Zühtü
Günal Türkmenoğlu, Asuman
Vennemann, Walter Torsten

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Bu projede Çayırhan, Davutoğlan, Beypazarı ve Ayaş civarları çalışılmış ve bu bölgelerin civarlarında yüzlek veren Çayırhan, Akpınar ve kısmen Kirmir Formasyonları içerisinde birbirini tamamlayan 7 değişik stratigrafik ölçülmüştür. Ölçülen detay stratigrafi kesitlerinde sedimantolojik, (mikrofasiyes ve sedimanter yapı analizi), jeokimyasal (ana ve iz elementler), XRD, duraylı izotop analizleri (δ13C ve δ18O) ve Sr izotop analizleri yapılmıştır. Ayrıca, devirsel stratigrafi, sekans stratigrafisi ve Fischer eğrisi uygulamaları da yapılmıştır. Elde edilen sonuçlar göl seviyesi değişimlerinin iklimsel etkili olduğunu ve küresel Miyosen iklim değişimleri ile paralellik gösterdiği tespit edilmiştir. Küçük ölçekli (Milankovitch devirleri) ve büyük ölçekli iklim değişikliklerinin varlığı sediman diziliminde farklı devirsellikler olarak gözlenmiş ve küçük ölçekli iklim değişikliklerinin havzayı denetleyen tektonik olaylardan etkilenmediklerini tespit edilmiştir. Yapılan sedimantolojik, devirsel stratigrafik, kil mineralojisi, palionolojik analizlere göre ölçülü istiflerin alt kısmında koyu renkli çamurtaşları, haki çamurtaşları, kireçtaşı ve jips ardalanmalarından oluşan devirler ıslak ve kuru iklim ardalanmalarını temsil etmektedir. Çayırhan istifin üst kısmında ise kırmızı ve yeşil çamurtaşlarının ve stramatolitik kireçtaşı/marn ile ardalanmalarının yine küçük ölçekte ıslak ve kuru iklim ardalanmalarını farklı litolojiler ile yansıttıkları tespit edilmiştir. Fakat büyük ölçekte bakıldığı zaman birbirini destekleyen tüm analiz bulguları sayesinde ve hatta duraylı izotop analizleri desteği ile de kesinleşen Üst Miyosen soğuk ve nemli iklimini ve takip eden Sıcak ve kurak iklim değişimlerini görmek mümkün olmaktadır. Havzayı denetleyen tektonik olayların iklim değişimine etkisi büyük ölçekte dolaylı olabileceği ortaya çıkmıştır. Havza kenarlarından yapılan gözlemlere göre havzadaki sediman gelimini kontrol eden yükselmiş ana kayaların farklılıkları yakın kısımlarda farklı tipte devirlerin oluşmasına sebep olmuştur. Buna rağmen küçük ölçekli iklim etkili devirsel çökellerin kayıtları tespit edilmiştir. Tektonik etkiler ile yükselen havzanın kapanması durumunda bile devirsellikler devam etmiştir.

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https://app.trdizin.gov.tr/publication/project/detail/TVRBME5UazU
https://hdl.handle.net/11511/49646

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Department of Geological Engineering, Project and Design

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Citation Formats

M. Stoica, İ. Ö. Yılmaz, Z. Batı, A. Günal Türkmenoğlu, and W. T. Vennemann, “Ankara civarı (Beypazarı-Çayırhan) miyosen yaşlı gölsel-karasal çökellerin devirsel sedimantoloji, sekans stratigrafisi, ve sedimanter jeokimya yöntemleri ile yüksek çözünürlükte incelenmesi,” 2009. Accessed: 00, 2020. [Online]. Available: https://app.trdizin.gov.tr/publication/project/detail/TVRBME5UazU.