YYÜ GCRIS Basic veritabanının içerik oluşturulması ve kurulumu Research Ecosystems (https://www.researchecosystems.com) tarafından devam etmektedir. Bu süreçte gördüğünüz verilerde eksikler olabilir.

Browsing by Author "Altun, Yusuf"

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    Geochemical Features and Magma Source Regional Characteristics of the Post-Collisional Plio-Quaternary Gozucu (taslicay-Agri) Volcanics, Eastern Anatolia, Turkey
    (Tmmob Jeoloji Muhendisleri Odasi, 2020) Aclan, Mustafa; Altun, Yusuf
    This study aimed to determine the petrographic and geochemical features of the Plio-Quaternary Gozucu (Taslicay-Agri) volcanics. These volcanics have subalkaline, calc-alkaline, high-K-series and shoshonitic features and are composed of basalt, andesite, trachyandesite, trachydacite and dacites. The Gozucu volcanics exhibit enrichment in light rare earth elements (LREE) and large ion lithophile elements (LILE) while showing depletion in heavy rare earth elements (HREE) and high field strength elements (HFSE). The average Sr and Ba values of Gozucu volcanics are close to continental crust values (Sr-379 ppm Ba-639 ppm), which means that these rocks were contaminated by the continental crust during formation. Low Nb/La (5.13 ppm) and high Ba/Rb (16.75 ppm) ratios indicate that the contribution of sediments was more than that of fluids during the contamination process of the Gozucu volcanics. Positive and negative trends of major and trace elements in the variation diagrams indicate fractional crystallization and a single mantle source. The Gozucu volcanics occurred with a partial melting of the spinel-rich lithospheric mantle source with 0.1-3% partial melting in the continental arc environment after the collision.
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    Syn-Collisional I-Type Esenkoy Pluton (Eastern Anatolia-Turkey): an Indication for Collision Between Arabian and Eurasian Plates
    (Pergamon-elsevier Science Ltd, 2018) Aclan, Mustafa; Altun, Yusuf
    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.