SHRIMP U-Pb zircon dating, bulk-rock geochemistry and Sr–Nd–Pb isotope Geochemistry of the Çaykara Intrusive Complex, Eastern Pontides, NE Turkey: Implications for lithospheric mantle and lower crustal sources in arc-related I-type magmatism.

The study area situated in the eastern of Black Sea region, (Trabzon) district and occupied the western part of the Kaçkar Batholith. This study aims to study petrological, geochronological and isotopically properties of plutonic rocks. SHRIMP U-Pb age analysis for Gündoğdu and Boğalı plutons,are 85.0 ±2.4Ma (Santonian) and 83.1±2 Ma (Campanian) respectively. Petrographically the Gündoğdu Pluton and Boğalı Pluton vary from granite to monzogranite. The isotopic ratios of 87Sr/86Sr and 143Nd/144Nd of the rocks belonging to the Gündoğdu and Boğalı Plutons are between 0.703552 to 0.711929 and 0.512222 to 0.512084 and range from 0.706097 to 0.706657 and 0.512279 to 0.512341, respectively. Chemical feauters of Gündoğdu and Boğalı pluton rocks indicate to dominant the FC, and magma mixing with minor amount of crustal contamination during the magma generation. The geochemical and isotopical features of Gündoğdu Pluton indicated to magma generated by the partial melting product of metagreywackes and partially amphibolitic rocks whilst the Boğalı Pluton partial melting of amphibolites rocks. The isotopic ratio of Sr–Nd–Pb, major and trace element features of the Gündoğdu pluton not perfectly shares the similar sources of the Boğalı Pluton or other Late Cretaceous Plutons from the region. The values indicate that the Gündoğdu Pluton has character of Iand S type granite and it can classify as hybrid granitoid (H-type) whereas the Boğalı Pluton has features of I-type granite. The Gündoğdu and Boğalı Plutons were formed during the last stage closure of the Neotethyan Ocean as result as a result of extensional arc and slab-roll back model.