Öz: Alaşehir Grabeni`nin güney kenarı, aynı gerilmeli rejim içinde sünek-kırılgan kataklastik kayaçlar içeren Alaşehir Sıyrılma Fayı (ASF) ile sınırlanmıştır. Bu sıyrılma fayı, Turgutlu`dan Alaşehir`e kadar yaklaşık 150 km boyunca yüzeylenmiş ve kuzeye düşük bir açıyla (100-300) eğimli olan yüzeydir. ASF` nin tektonik aktivitesinin sonlanmasını yorumlayan iki ana görüş vardır. Birincisi, fayın son hareketinin, Pliyo-Kuvaterner yüksek açılı normal faylar tarafından kesilmiş olması gerçeğine dayanarak Geç Miyosen`de sona erdiğidir. Diğer görüş ise, ASF`ye ait kataklastik kayaçlarından elde edilen yüzeylenme yaşlarına dayanarak tektonik aktivitesinin Pliyo-Kuvaterner`e kadar devam ettiğidir. Bu tartışmaya katkıda bulunmak için Salihli ve Alaşehir bölgelerindeki ASF`nin tavan bloğundaki Neojen istifinin ölçülmüş stratigrafik kayıtlarını bildiriyoruz. Alaşehir Grabeni`nin çökelme evrimi, Miyosen (Gerentaş, Kaypaktepe ve Acıdere Formasyonları), Üst Miyosen-Üst Pliyosen (Göbekli, Yenipazar ve Erendalı Formasyonları) ve Pliyo-Kuvaterner yaşlı tortul kayaçlar (Asartepe Formasyonu) olmak üzere üç pakette tanımlanabilir. Alaşehir Grabeni`nde Miyosen ve Pliyo-Kuvaterner paketleri göl, akarsu ve alüvyal yelpaze ortamları da dahil olmak üzere benzer sedimantasyon ortamları ile temsil edilmektedir. Bu iki dönem taşkın yatağı sedimantasyon ortamını temsil eden Geç Miyosen-Geç Pliyosen zamanıyla ayrılmıştır. Taşkın yatağı tortulları, ASF`ye ait kataklastik kayaçların yarı-yuvarlak-yuvarlak kırıntılarına dayanarak, stratigrafik tabandan itibaren ilk 140metreden sonra tektonik olarak hareketli olmayan ve kendini tekrarlayan monoton bir dizidir. Bunlar, Geç Miyosen Geç Pliyosen döneminde oluşan tektonik durgunluk dönemini temsil etmektedir ve ASF`deki tektonik aktivitenin Geç Miyosen döneminde sonlandığını gösterir. Ancak, Alaşehir Grabeni`ni kesen D-B yönlü normal fayların gösterdiği gibi, tektonik aktivite Plio-Kuvaterner`de yeniden canlanmış olabilir.
Alaşehir Sıyrılma Fayı
Alaşehir Grabeni
Neojen istif
kırıntıların küreselliği
taşkın yatağı tortuları
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