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Geochemistry, zircon U-Pb geochronology, and tectonic setting of the Taşlıçay Granitoids, Eastern Anatolia, Turkey

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Abstract

The Taşlıçay granitoids are located in the East Anatolian Accretionary Complex (EAAC), eastern Turkey, and consist of I-type (gabbro, diorite, quartz diorite, monzodiorite, quartz monzodiorite) and S-type (tonalite, granodiorite, monzogranite, granite) granitoid rocks. Whole rock major and trace element data define different two rock assemblages on Harker diagrams. They also suggest that these two different rock assemblages was created from calc-alkaline hybrid magma source which is consisted of the litospheric mantle-derived mafic magma and lower continental crust-derived felsic magma with mixing and assimilation fractional crystallization and assimilation processes. The high average Rb/Nb ratio of the I-type rocks from the Taşlıçay granitoids indicates that the additive of lower continental crust material during the mixing of mafic and felsic magma more than litospheric mantle material. The Taşlıçay granitoids display enrichment in large ion litophile elements (LILE) (Cs, Rb, Ba, U, Th, Pb), light rare earth element (LREE) (I-type; LaN/YbN = 7.38–17.53; S-type; LaN/YbN = 6.27–26.73), and depleted in high field strength element (HFSE) (Nb, Ta, P, Ti) implying a subduction-related magmatic signature. The zircon U-Pb geochronological data (granodiorite, 19.7 ± 0.3 Ma; monzogranite, 20.3 ± 0.3 Ma) obtained from the Taşlıçay granitoids reveal that the continent-continent collision between the Arabian and Eurasian plates along the Bitlis-Zagros suture zone occurred in Early Miocene (Burdigalian) or before Miocene.

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Acknowledgements

The authors would like to thank to Tamer Rızaoğlu and Ze Liu for their help in the zircon U-Pb dating analysis. This investigation has been funded by Scientific Research Projects Office of Van Yüzüncü Yıl University (YYU-BAP, Project No: 2014-YL 160).

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Açlan, M., Duruk, H.İ. Geochemistry, zircon U-Pb geochronology, and tectonic setting of the Taşlıçay Granitoids, Eastern Anatolia, Turkey. Arab J Geosci 11, 336 (2018). https://doi.org/10.1007/s12517-018-3674-4

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