Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey

Özkaymak, Çağlar; Uzel, Bora; Sözbilir, Hasan

Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey

Bora UZEL, (Dokuz Eylül Üniversitesi, Jeoloji Mühendisliği Bölümü, Buca, İzmir,)

Hasan SÖZBİLİR, (Dokuz Eylül Üniversitesi, Jeoloji Mühendisliği Bölümü, Buca, İzmir,)

Çağlar ÖZKAYMAK (Dokuz Eylül Üniversitesi, Jeoloji Mühendisliği Bölümü, Buca, İzmir,)

Turkish Journal of Earth Sciences

11 0

Yıl: 2012 Cilt: 21 Sayı: 4 Sayfa Aralığı: 439 - 471 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022

Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey

Öz:

Batı Anadolu Genişleme Bölgesi içerisindeki İzmir Körfezi KD, KB, K–G ve D–B uzanımlı faylar tarafından kontrol edilen ve aktif olarak gelişmekte olan sığ denizel bir havzadır. Körfez topografik olarak D–B doğrultulu iç körfez ve KB–GD uzanımlı dış körfez olmak üzere iki kısımdan oluşan L-şekilli bir üzerlemiş havzadır. İzmir İç Körfezi yaklaşık 5–7-km genişliğinde, 25-km uzunluğunda, D–B gidişli ve bölgesel ölçekli açısal uyumsuzluklarla birbirinden ayrılan (i) geç Kretase–Paleosen yaşlı temel kayaları, (ii) erken Miyosen–erken Pliyosen yaşlı eski havza çökelleri ve (iii) Pliyo–Kuvaterner yaşlı genç havza çökellerinden oluşur. Eski havza çökelleri 0.5–1.5-km kalınlığındaki kıvrımlanmış ve yüzeylemiş olan kömür içerikli karasal volkanosedimanter bir istif içerir. İç Körfeze ait genç havza çökelleri Görece formasyonu ve güncel alüvyonal çökelleden yapılıdır. Bu çalışma İzmir Körfez alanının erken–geç Miyosen zaman aralığında kalk-alkali ve alkali volkanizmanın eşlik ettiği deniz düzeyi üzerindeki KD–GB uzanımlı gölsel havzayla simgelendiğini göstermektedir. Geç Pliyosen’den itibaren İzmir Körfezi Ege Denizi suları altında kalmaya başlar ve böylece D–B uzanımlı İzmir İç Körfezi’ nin oluşumu gerçekleşir. Ayrıntılı jeolojik haritalama, jeomorfolojik veriler, bilgisayar tabanlı kinematik analiz çalışmaları ve arazi gözlemlerine göre havzanın erken Miyosen’de başlayan tektonik evrimi dört evreye ayrılabilir. İlk iki evre KD–GB uzanımlı gölsel volkanosedimenter havzanın oluşumunu sonuçlamıştır, üçüncü evre eski havza dolgusunun deformasyonuna neden olan eğim atımlı ve doğrultu atımlı faylanmanın gelişimiyle karakteristiktir, geç Pliyosen’de başlayan son genişleme evresi ise İzmir İç Körfezi’ nin açılmasına neden olmuştur.

Anahtar Kelime:

Konular: Jeoloji

Batı Anadolu’ da aktif olarak gelişen üzerlemiş havzanın neotektonik evrimi: İzmir İç Körfezi, Turkey

Öz:

İzmir Bay is an actively growing shallow marine basin controlled by active faults trending NE, NW, N–S and E–W, in the West Anatolian Extensional Province. The bay of İzmir is a lazy L-shaped superimposed basin which is topographically divided into an E–W-trending inner bay and a NW-trending outer bay. The Inner Bay of İzmir is an asymmetric graben structure approximately 5–7 km wide and 25 km long containing (i) upper Cretaceous–Palaeocene basement, (ii) an older succession of lower to upper Miocene basin fill, overlain with angular unconformity by (iii) a younger Plio–Quaternary basin fill. The older succession contain a 0.5- to 1.5-km-thick, folded and coal-bearing continental volcano-sedimentary sequence. The younger succession of the Inner Bay of İzmir includes the upper Pliocene–Pleistocene Görece formation and Holocene to recent alluvial fan, fan delta to shallow marine deposits. Th is study reveals that the İzmir Bay region was above sea level and the site of a NE–SW-trending lacustrine environment associated with calc-alkaline to alkaline volcanism during the early to late Miocene. By the late Pliocene the modern coastal areas of İzmir were inundated beneath the waters of the Aegean Sea by the creation of the E–Wtrending Inner Bay of İzmir. Detailed geological mapping, geomorphological evidence and computer-based kinematic analysis show that the tectonic evolution of the basin since the early Miocene can be divided into four stages. Two early extensional stages resulted in the formation of NE–SW-trending lacustrine volcano-sedimentary basins; the third stage, characterized by dip- to strike-slip faulting, deformed the older basin fill units, and the final extensional stage resulted in the opening of the Inner Bay of İzmir since the Late Pliocene.

Anahtar Kelime:

Konular: Jeoloji

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık

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APA	Uzel B, Sözbilir H, Özkaymak Ç (2012). Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey. , 439 - 471.
Chicago	Uzel Bora,Sözbilir Hasan,Özkaymak Çağlar Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey. (2012): 439 - 471.
MLA	Uzel Bora,Sözbilir Hasan,Özkaymak Çağlar Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey. , 2012, ss.439 - 471.
AMA	Uzel B,Sözbilir H,Özkaymak Ç Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey. . 2012; 439 - 471.
Vancouver	Uzel B,Sözbilir H,Özkaymak Ç Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey. . 2012; 439 - 471.
IEEE	Uzel B,Sözbilir H,Özkaymak Ç "Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey." , ss.439 - 471, 2012.
ISNAD	Uzel, Bora vd. "Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey". (2012), 439-471.

APA	Uzel B, Sözbilir H, Özkaymak Ç (2012). Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey. Turkish Journal of Earth Sciences, 21(4), 439 - 471.
Chicago	Uzel Bora,Sözbilir Hasan,Özkaymak Çağlar Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey. Turkish Journal of Earth Sciences 21, no.4 (2012): 439 - 471.
MLA	Uzel Bora,Sözbilir Hasan,Özkaymak Çağlar Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey. Turkish Journal of Earth Sciences, vol.21, no.4, 2012, ss.439 - 471.
AMA	Uzel B,Sözbilir H,Özkaymak Ç Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey. Turkish Journal of Earth Sciences. 2012; 21(4): 439 - 471.
Vancouver	Uzel B,Sözbilir H,Özkaymak Ç Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey. Turkish Journal of Earth Sciences. 2012; 21(4): 439 - 471.
IEEE	Uzel B,Sözbilir H,Özkaymak Ç "Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey." Turkish Journal of Earth Sciences, 21, ss.439 - 471, 2012.
ISNAD	Uzel, Bora vd. "Neotectonic evolution of an actively growing superimposed basin in Western Anatolia: The inner bay of İzmir, Turkey". Turkish Journal of Earth Sciences 21/4 (2012), 439-471.