Sources and petrogenesis of Jurassic granitoids in the Yusufeli area, Northeastern Turkey: Implications for pre- and post-collisional lithospheric thinning of the eastern Pontides

• DOI: 10.1016/j.tecto.2009.10.009
• Publication Date: 2009-10-25T08:10:03Z
• Authors: Abdurrahman Dokuz; Orhan Karsli; Bin Chen; İbrahim Uysal
• Keywords: Fractional crystallization (geology); Petrogenesis; Quartz monzonite

Abstract Small granitoids emplaced into the early Jurassic volcani-clastic succession in the Yusufeli area, northeastern Turkey, can be temporally and geochemically classified into two groups: early Jurassic low-K and late Jurassic high-K. 40Ar–39Ar hornblende analyses yielded 188.0 ± 4.3 Ma for the Dutlupinar intrusion, dating the subduction related rifting in the region. It comprises metaluminous to weakly peraluminous (ASI = 0.94–1.11) granodiorite and, to a lesser extent, tonalite whose K2O-poor (