Petrogenesis of Miocene volcanism in the Central Anatolia: Geochemical, isotopic and geochronological evidence

Özdamar, Şenel; Billor, Mehmet Z.; Sarıkaya, Oral; Şans, Bala Ekinci; Yıldız, Taşkın Deniz; Esenli, Fahri; Zou, Haibo; Sherlock, Sarah and Gültekin, Ali Haydar (2024). Petrogenesis of Miocene volcanism in the Central Anatolia: Geochemical, isotopic and geochronological evidence. Journal of Volcanology and Geothermal Research, 450, article no. 108086.

DOI: https://doi.org/10.1016/j.jvolgeores.2024.108086

Abstract

This paper presents the first ⁴⁰Ar/³⁹Ar age data, new bulk-rock major-trace element compositions and Ndsingle bondSr isotope geochemistry, combined with detailed geological mapping of Galatia Volcanic Province (GVP) in the northwest Central Anatolia (Turkey). Here, there are voluminous extrusive rocks in a wide compositional range: a basalt, andesite and trachyte suite, and their pyroclastic equivalents. ⁴⁰Ar/³⁹Ar dating of two whole-rock samples from the GVP yielded plateau ages of 21.76 ± 0.8 Ma and 20.97 ± 0.5 Ma, constrain the volcanic activity at ca. 21 Ma (Aquitanian). The samples show by sub-parallel light rare earth element (LREE)-enrichment and relatively flat heavy rare earth element (HREE) patterns and moderate fractionation [average (La/Yb)_N = 13.5]. Their initial ^87/86Sr values vary between 0.704619 and 0.704998, while initial ^143/144Nd values lie between 0.512673 and 0.512755. Integration of the geochemical and geochronological with geological data we propose that the volcanic rocks in the northern area of GVP with calc-alkaline affinity were produced by a lithospheric mantle magma in an extensional setting.

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