Mesoscopic Tectonic Features of the Marmara Island and the Kapıdağı Peninsula, NW Turkey
Pre-Permian metamorphites formed in various environments and Alpine granitoidic rocks are found in the Marmara Island and the Kapıdağı Peninsula. Metamorphic rocks have undergone progressive regional metamorphism under medium pressure/medium-high temperature (MPMHT) conditions and four phases of deformation by Caledonian (?) orogeny. These are, in sequence, (1) schistosity and foliation planes, (2) overturned or recumbent, isoclinical-close folds, mineral and crenulation lineations, crenulation cleavages and mullion structures, (3) isoclinical-close or similar folds, mineral and crenulation lineations, crenulation cleavages and mullion structures and (4) gentle-parallel folds, crenulation cleavages and lineations. In the study area the metamorphism and accompanying deformations came to a close with the uplift of the region before Permian. Calcalkaline magmatism occured during the Alphine orogeny and sub-sequently Ocaklar and Çeltikçi granitoids were emplaced in the region. In the north of the Kapıdağı Peninsula the Ocaklar granitoids deformed by a shear zone that trends approximately east-west. This shear zone developed by an intra-orogenic strain. It is observed that the region has been affected by active subsidence and uplifting today.
AKSOY, Rahmi (1996) "Mesoscopic Tectonic Features of the Marmara Island and the Kapıdağı Peninsula, NW Turkey," Turkish Journal of Earth Sciences: Vol. 5: No. 3, Article 15. Available at: https://journals.tubitak.gov.tr/earth/vol5/iss3/15