Syn-Collisional I-Type Esenkoy Pluton (Eastern Anatolia-Turkey): an Indication for Collision Between Arabian and Eurasian Plates

Abstract

The Esenkoy pluton which is situated in the East Anatolian Accretionary Complex (EACC) is represented by I-type, metalumino, calc-alkaline, VAG + syn-COLG, gabbro, diorite, quartz diorite, tonalite and granodiorite type rocks. This paper presents the characteristics of the above granitoids on their major, trace, rare earth elements (REE) and their zircon U-Pb dating. Zircon U-Pb crystallisation ages for gabbro, tonalite and granodiorite are 22.3 +/- 0.2 Ma, 21.7 +/- 0.2 Ma and 21.8 +/- 0.2 Ma respectively. Esenkoy granitoids show medium and high-K calc-alkaline character, with six exceptional K-poor sample plot in tholeiitic series field. The Rb/Y-Nb/Y diagram for Esenkoy granitoids display subduction zone enrichment trend. The data which obtained from major, trace and REE geochemical characteristics and Pb-206/U-238 ages indicate that the collision which is take place between Arabian and Eurasian plates along the Bitlis-Zagros suture zone has begun in the Early Miocene (Aquitanian) or before from Early Miocene. (C) 2018 Elsevier Ltd. All rights reserved.