Kaz Dağı Civarındaki Kazdağ Masifi Metamorfitlerinin Metamorfizma Özellikleri, Edremit – Balıkesir

Abstract

The Kazdağ Massif begins with Fındıklı formation, which consists of amphibole gneisses, micaschists and metacarbonates. On top, with a tectonic contact, Tozlu formation consisting of amphibolites and metaophiolites and Sarıkız formation consisting of crystallized limestones are observed. At the top, again with a tectonic contact, Sütüven formation, which is mostly made of gneisses, is located. Initially, Kazdağ Massif was exposed to a progressive metamorphism from epidote-amphibolite facies (430-500oC temperature-5-8 kbar pressure) to staurolite-almandine sub-facies of amphibolite facies (550-625oC temperature-5-8 kbar pressure-20-30 km depth) whose effects are observed in Fındıklı and Sütüven formations. In the Tozlu formation, the metamorphism is initially observed in amphibolite facies. Later, the Massif underwent the progressive metamorphism in the sillimanite-almandine-orthoclase sub-facies of the upper amphibolite facies at 650-725oC temperature-3-6 kbar pressure and at 10-20 km depth. This metamorphism is observed in Fındıklı and Sütüven formations. These second metamorphism effects are not observed in Tozlu formation. Therefore, amphibolite facies metamorphism of Tozlu formation developed in a different environment. Tozlu formation is the separate tectonic slice within Kazdağ Massif. The emplacement of Tozlu formation into Kazdağ Massif, and therefore the tectonic slicing of Kazdağ Massif within itself, must have been after second metamorphism stage in upper amphibolite facies. After this tectonic slicing, the whole of Massif underwent the regressive metamorphism in greenschist facies at 375-430oC temperature-2-3.5 kbar pressure and at depth of ~10 km. © 2023, Gumushane University. All rights reserved.