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Petrogenesis of Miocene volcanism in the Central Anatolia: Geochemical, isotopic and geochronological evidence
(Elsevier, 2024) Ozdamar, Senel; Billor, Mehmet Z.; Sarikaya, Oral; Sans, Bala Ekinci; Yildiz, Taskin Deniz; Esenli, Fahri; Zou, Haibo
This paper presents the first 40 Ar/ 39 Ar age data, new bulk -rock major -trace element compositions and Nd - Sr 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. 40 Ar/ 39 Ar 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 87/86 Sr values vary between 0.704619 and 0.704998, while initial 143/144 Nd 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.