Eclogae Geol Helv 75:437–446īürküt Y (1966) Batı Anadolu’da yeralan plütonların mukayeseli jenetik etüdü. Geotecton Res 95:1–11īingöl E, Delaloye M, Ataman G (1982) Granitic intrusions in western Anatolia, a contribution to the geodynamic study of this area. Lithos 155:289–309īehrmann JH, Seckel C (2007) Structures, flow stresses, and estimated strain rates in metamorphic rocks of the Small Cyclades Islands Iraklia and Schinoussa (Aegean Sea, Greece). Turk J Earth Sci 7:79–85Īltunkaynak S, Sunal G, Aldanmaz E, Genç CS, Dilek Y, Furnes H, Foland KA, Yang J, Yıldız M (2012) Eocene granitic magmatism in NW Anatolia (Turkey) revisited: new implications from comparative zircon SHRIMP U–Pb and 40Ar–39Ar geochronology and isotope geochemistry on magma genesis and emplacement. Turk J Earth Sci 5:187–195Īksoy R (1998) Strain analysis of the Kapıdağ Peninsula shear zone in the Ocaklar Granitoid, NW Turkey. Based on the new and published data, it is concluded that the westward movement of the Anatolian plate might have been active almost continuously from the Middle Eocene until recent times.Īksoy R (1996) Mesoscopic tectonic features of the Marmara island and the Kapıdağı peninsula, NW Turkey. The differential stress related to the shearing was <50 MPa as is indicated by the size of recrystallized quartz grains. 35 Ma), meaning that the Kapıdağ shear zone should have been active during Middle to Late Eocene times. Published K–Ar and 39Ar– 40Ar cooling ages of hornblende and biotite suggest that cooling below 500–300 ☌ occurred during the Eocene (ca.

Based on petrographic data, deformation microfabrics of quartz and feldspar, and the slip systems in quartz, the dextral shearing should have been active at T = 500–300 ☌ and P < 5 kbar. Macroscopic and microscopic shear-sense indicators, such as SC fabrics, shear bands, σ-clasts and mica fish, unequivocally suggest dextral strike-slip for the Kapıdağ shear zone.

The northern part of the Kapıdağ Peninsula (Marmara Sea, NW Turkey) is affected by the E–W trending Kapıdağ shear zone, which cuts through calc-alkaline granitoids of the Ocaklar pluton resulting in mylonitic orthogneiss.

Rose diagram sinistral dextral movement