Peter A. FLOYD, Levent ÖZGÜL, M. Cemal GÖNCÜOĞLU

Metabasite blocks from the Koçyaka HP-LT metamorphic rocks, Konya, Central Aanatolia:Geochemical evidence for an arc-back-arc pair?

Torit-Anatolit platformunun kuzey kenarında yeralan Kütahya-Bolkardağ Kuşağı, allokton ofiyolit parçaları yanında Yüksek Basınç-Düşük Sıcaklık (YB-DS) metamorfizrnası geçirmiş tektonik dilimler içerir. Bu dilimlerden biri olan Koçyaka Metamorfık Karmaşığı Konya'nın kuzeydoğusunda yüzeylenir. Birim, Üst Kretase karbonatlı metasedimenter kayalar üzerinde yeralan ofiyolitli karışık özelliğindeki Altınekin ve Akcaşar melanjlanndan oluşan bir tektonostratigrafik dizilim sunar. Her iki melanjda da düşük dereceli metamorfizme ile üzerlenmiş YB-DS metamorfizması ürünü glokofanlı topluluklar içeren ve yastık lav ve amfibolitden oluşan metabazik kayalar yeralır. Ofiyolitik kayaların parçalanma öncesindeki jeodinamik konumlan hakkında farklı görüşler vardır. Bu görüşlerden ilkine göre bu kayalar kuzeydeki İzmir-Ankara-Erzincan Neotetis okyanus kolundan türemiştir. Diğer görüşe göre ise bu okyanusal kabuk parçalan farklı bir Neotetis okyanus koluna aittir. Jeokimyasal karşılaştırmalar, melanjların metasedimanter kayalarının okyanus tabanı çökelleri için tipik olan pelajik ve karbonatlı çökellerinin karışmasından oluştuğunu gösterir. Her iki melanj içinde yeralan metabazik blokları, plajiyoklas-klinopiroksen fenokristalli olup uyumsuz elementlerce tüketilmiştir ve bütünselliği olan bir magrnatik grup içinde yeraiırlar. Bu metabazik kayalar genelde Normal Okyanus Sırtı Bazaltlara (N-MORB) benzerlikler sunmakla birlikte birleşirnsel konaklan yayardı havza ortamı için daha tipiktir. Orta Anadolu Kristalen Kompleksinde (OAKK) yer alan stratiform dalma-batma zonu üstü (SSZ) ofiyolitleri ile oluşum, tektonik yerleşme yaşlarının benzerlikleri ve jeokimyasal deneştirmeler dikkate alındığında, Konya'daki yayardı özellikli metabazitlerle OAKK'daki yay özellikli SSZ tipi ofiyolitlerin bir yay-yayardı ikilisini temsil edebileceği düşünülmektedir. Eğer bu karşılaştırma geçerli ise, her iki birim de izmir-Ankara-Erzincan Okyanusundan türemiş olabilirler. Bu durum, OAKK ile Torid-Anatolit Platformu arasında ayrı bir "iç Toros Okyanusu" nün varlığını gereksiz kılar.

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