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TAVŞANLI ZONU: ANATOLİD-TORİD BLOKU'NUN DALMA-BATMAYA UĞRAMIŞ KUZEY UCU

Journal Name:

  • Maden Tetkik ve Arama Dergisi

Publication Year:

  • 2011

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Abstract (2. Language): 
The Tavşanlı Zone constitutes the northern margin of the Anatolide-Tauride Block that has undergone high pressure-low temperature metamorphism during the Cretaceous. It is bounded in the north by the İzmir-Ankara suture and in the south by the rocks of the Afyon Zone. The Tavşanlı Zone is subdivided into four tectonic units. At the base there is the Orhaneli Group, which shows a regular stratigraphic succession that has underdone metamorphism at ~24 kbar pressure and 430-500 °C temperature during the Late Cretaceous (~80 Ma). From the base upward the Orhaneli Group consists of micaschist, marble and metabasite-metachert-phyllite, and is tectonically overlain by ophiolitic melange or directly by ophiolite. The ophiolitic melange consists of basalt, chert, pelagic shale and limestone, and has undergone an incipient blueschist facies metamorphism. The ophiolite constitutes the topmost member of the tectonic stack. It consists mainly of peridotite (>%90) with minor gabbro and pyroxenite, and is cut by isolated diabase dykes. In the western part of the Tavşanlı Zone all these tectonic units are intruded by Lower to Middle Eocene granodiorites, and in the eastern part of the Tavşanlı Zone the blueschists and ophiolite are overlain by Lower Eocene marine limestones. The northern margin of the Anatolide-Tauride Block was buried in an intra-oceanic subduction zone during the Campanian and Paleocene underwent HP/LT metamorphism. The blueschists were exhumed during ongoing subduction and prior to continental collision through a thrust fault at the base and a normal fault at the top. In terms of tectonic setting and the timing of the geological events, the Tavşanlı Zone exhibits close similarities to the Semail ophiolite and the underlying blueschists.
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Abstract (Original Language): 
Tavşanlı Zonu, Anatolid-Torid Bloku'nun kuzey ucunda yer alan ve Kretase'de yüksek basınç-düşük sıcaklık koşullarında metamorfizma geçirmiş kesimini oluşturur. Kuzeyden İzmir-Ankara Kenedi, güneyden Afyon Zonu kayaları tarafından sınırlanan Tavşanlı Zonu başlıca dört tektonik üniteden oluşmuştur. En altta düzenli bir stra-tigrafik istif sunan ve Geç Kretase'de (~80 my) ~24 kbar basınç, 430-500 °C sıcaklıkta metamorfizma geçirmiş olan Orhaneli Grubu yer alır. Orhaneli Grubu kendi içinde alttan üste doğru mikaşist, mermer ve metabazit-meta-çört-fillat ardalanmasından meydana gelmiştir. Orhaneli Grubu üzerinde tektonik dokanaklarla ofiyolitli melanj veya doğrudan ofiyolit kütleleri oturur. Ofiyolitli melanjı oluşturan bazalt, çört, pelajik şeyl, kireçtaşı gibi kayalar düşük sıcaklıklarda bir başlangıç mavişist metamorfizması geçirmiştir. Tektonik istifin en üst üyesini oluşturan ofiyolit kütlesinin büyük bir kesimi (>%90) peridotitlerden yapılmıştır. Peridotitlere az oranlarda gabro, piroksenit gibi kayalar eşlik eder. Peridotit kütleleri izole diyabaz daykları tarafından kesilmiştir. Tavşanlı Zonu'nun batı kesim¬lerinde tüm bu birimler Alt-Orta Eosen granodiyoritleri tarafından kesilir, doğu kesimlerinde ise Erken Eosen yaşlı denizel kireçtaşları, ofiyolit ve mavişistleri uyumsuzlukla örter. Anatolid-Torid Bloku'nun kuzey ucu Kampa-niyen'de bir okyanus içi dalma-batma zonuna girerek YB/DS koşullarında deforme olmuş ve metamorfizma geçir¬miştir. Mavişistler, dalma-batma olayı sürerken, kıta-kıta çarpışması gerçekleşmeden, Maastrihtiyen ve Pa-leosen'de, tabanda bindirme fayı, tavanda normal fay arasında bir tektonik dilim olarak yüzeye çıkmıştır. Tavşanlı Zonu tektonik konumu ve jeolojik olayların zamanlaması açısından Umman doğusunda bulunan Semail ofiyolitine ve altındaki mavişist ve eklojitlere büyük benzerlik sunar.
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