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dc.contributor.authorAslan, Zafer
dc.contributor.authorArslan, Mehmet
dc.contributor.authorTemizel, Irfan
dc.contributor.authorKaygusuz, Abdullah
dc.description.abstractVolcanic rocks from the GumuAYhane area in the southern part of the Eastern Pontides (NE Turkey) consist mainly of andesitic lava flows associated with tuffs, and rare basaltic dykes. The K-Ar whole-rock dating of these rocks range from 37.62 +/- 3.33 Ma (Middle Eocene) to 30.02 +/- 2.84 Ma (Early Oligocene) for the andesitic lava flows, but are 15.80 +/- 1.71 Ma (Middle Miocene) for the basaltic dykes. Petrochemically, the volcanic rocks are dominantly medium-K calc-alkaline in composition and show enrichment of large ion lithophile elements, as well as depletion of high field strength elements, thus revealing that volcanic rocks evolved from a parental magmas derived from an enriched mantle source. Chondrite-normalized rare-earth element patterns of the volcanic rocks are concave upwards with low- to-medium enrichment (La-CN/Lu-CN = 3.39 to 12.56), thereby revealing clinopyroxene- and hornblende-dominated fractionations for andesitic-basaltic rocks and tuffs, respectively. The volcanic rocks have low initial Sr-87/Sr-86 ratios (0.70464 to 0.70494) and epsilon Nd-(i) values (+1.11 to +3.08), with Nd-model ages (T-DM) of 0.68 to 1.02 Ga, suggesting an enriched lithospheric mantle source of Proterozoic age. Trace element and isotopic data, as well as the modelling results, show that fractional crystallization and minor assimilation played an important role in the evolution of the volcanic rocks studied. The Eocene to Miocene volcanism in the region has resulted from lithospheric delamination and the associated convective thinning of the mantle, which led to the partial melting of the subduction-metasomatized lithospheric mantle.en_US
dc.description.sponsorshipScientific Research Projects' Foundation of Karadeniz Technical UniversityKaradeniz Technical Universityen_US
dc.description.sponsorshipThis work was financially supported by the Scientific Research Projects' Foundation of Karadeniz Technical University. We thank Enver AKARYALI, Mehmet Ali GUCER, and Emre AYDINCAKIR for their help in the field studies, as well as Bin CHEN for performing the K-Ar dating and Sr-Nd isotope analyses. We are likewise grateful to the handling editor A. Moeller and two anonymous reviewers for their constructive and insightful comments to improve the paper.en_US
dc.publisherSpringer Wienen_US
dc.relation.ispartofMineralogy and Petrologyen_US
dc.subjectCentral Anatoliaen_US
dc.subjectNe Turkeyen_US
dc.subjectWestern Anatoliaen_US
dc.subjectMagma Generationen_US
dc.subjectNeotethyan Convergenceen_US
dc.subjectGranitoid Magmatismen_US
dc.subjectTectonic Evolutionen_US
dc.subjectMantle Dynamicsen_US
dc.titleK-Ar dating, whole-rock and Sr-Nd isotope geochemistry of calc-alkaline volcanic rocks around the GumuAYhane area: implications for post-collisional volcanism in the Eastern Pontides, Northeast Turkeyen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.departmentGümüşhane Üniversitesien_US
dc.authoridArslan, Mehmet / 0000-0003-0816-4168
dc.authoridTemizel, Irfan / 0000-0002-6293-8649
dc.authorwosid, Abdullah / Q-2029-2015
dc.authorwosidArslan, Mehmet / S-1208-2017
dc.authorwosidTemizel, Irfan / AAR-2191-2020

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