Petrogenesis of the Neogene-Quaternary mafic lavas from the Tunceli-Elazığ region (Eastern Turkey)

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2022-1-27
Aktağ, Alican
The most primitive members of the Late Miocene Tunceli and Pleistocene Elazığ mafic volcanics within the Eastern Anatolian Volcanic Province (EAVP) preserve details regarding the chemical geodynamics of eastern Anatolia. This study, therefore, primarily aims to establish the chemical composition of the source components that have contributed to these volcanics to enhance the understanding of the nature of mantle domains beneath eastern Anatolia. Quantitative modelings suggest that at least three distinct components have been involved in the genesis Tunceli and Elazığ Volcanics; (i) a depleted asthenospheric mantle component (DM), (ii) an enriched asthenospheric component representing recycled oceanic lithospheric lithologies (i.e., C-like), and (iii) a EMII-type component representing fusible metasomatized SCLM domain(s). The mixing modelings indicate a common asthenospheric source domain for these volcanics, consisting of a solid-state mixture of ca. 80 a % C-like component and ca. 20% a DM component. This indicates that the asthenosphere beneath eastern Anatolia is heterogeneous, including the recycled oceanic lithologies. In addition, the amount of metasomatized SCLM contribution appears to be larger (ca. 10-30%) in the Tunceli lavas compared to the Elazığ Volcanics (< 10%). This, in turn, explains the OIB-like and subduction-related signatures observed in the Elazığ and Tunceli Volcanics, respectively. The melting modelings suggest that the SCLM domain(s) have been detached from the eastern Anatolian lithosphere and occur as fusible pods in the asthenosphere. In this regard, it can be proposed that the delamination process/drip tectonics may be the main driving mechanism of the post-collisional melt generation in eastern Anatolia.

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Citation Formats
A. Aktağ, “Petrogenesis of the Neogene-Quaternary mafic lavas from the Tunceli-Elazığ region (Eastern Turkey),” Ph.D. - Doctoral Program, Middle East Technical University, 2022.