Akademik Veri Yönetim Sistemi
LITHOS, cilt.518, 2025 (SCI-Expanded, Scopus)
In this study, we investigate the petrology, age, whole-rock geochemistry, and Sr-Nd isotopic compositions of post-collisional andesitic suites from the & Idot;kizce and Ulubey (Ordu) areas of the Eastern Pontides Orogenic Belt (EPOB) to elucidate their magma source characteristics and the region's geodynamic evolution. The Ar-40-Ar-39 dating of the & Idot;kizce and Ulubey andesitic suites yielded cooling ages of similar to 51-49 Ma and similar to 49-46 Ma (Middle Eocene), respectively. Both & Idot;kizce and Ulubey andesite suites have adakitic geochemistry, displaying medium to high-K, high La-N/Yb-N (similar to 17.8-23.1 and 8.9-23.3, respectively) and Sr/Y (79-138 and 62-143, respectively) ratios. Besides, the adakitic suites show similar LREE-enriched and HREE-flattened patterns (La-N/Lu-N = 11.3-23.7 and 8.8-28.2, respectively) with insignificant Eu anomalies (Eu-N/Eu* =0.90-1.08 and 0.82-1.11, respectively). The & Idot;kizce and Ulubey adakitic suites have Sr-87/Sr-86((i)) (0.703861-0.703973 and 0.704347-0.704437), and Nd-143/Nd-144((i)) (0.512810-0.512846 and 0.512662-0.512748) with positive epsilon Nd-(i) values (4.57-5.27 and 1.06-3.39), respectively. Combining the whole-rock geochemical and Sr-Nd isotope dataset of the studied adakitic andesitic suites suggests two different melt sources, whereby the & Idot;kizce adakitic suite was generated from slab-derived melts and the Ulubey adakitic suite originated from delaminated lower crust-derived melts, each of which also interacted with the lithospheric mantle components in a post-collisional tectonic setting during the Middle Eocene period.