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

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.


Geochemistry of mafic lavas from Sivas, Turkey and the evolution of Anatolian lithosphere
KÜRKCÜOĞLU, BİLTAN; Pickard, Megan; Sen, Pinar; Hanan, Barry B.; Sayıt, Kaan; Plummer, Charles; ŞEN, ERDAL; Yurur, Tekin; Furman, Tanya (2015-09-01)
Near-contemporaneous suites of mafic lavas from Sivas, Central Anatolia record different petrogenetic histories on the eastern and western sides of a major regional suture marked by the Kizihrmak River, The Sivas basaltic suite has major and trace element compositions suggesting derivation from an anhydrous peridotitic mantle source region. Basaltic trachyandesites in this group are related by up to similar to 65% fractional crystallization of the observed anhydrous mineral phases from a frequently-erupted ...
Geochemical features of multi component mantle source domains beneath Central Anatolia
Kürkçüoğlu, Biltan; Furman, Tanya; Pickard, Megan; Şen, Erdal; Hanan, Barry; Şen, Pınar; Sayıt, Kaan; Yürür, Mehmet Tekin (2016-05-16)
Extensive volcanic activities were developed in Central Anatolia, due to dynamic nature o f the tectonic regime. Although the most of the volcanic zones are represented by major Stratovolcanoes, severe basaltic magmatism with lack of the central cones, were generated over all the Central Anatolia. In this study, we focus on Sivas mafic product s to shed more light on the mantle components, beneath the central Anatolia , that were not investigated in depth so far. Sivas mafic lavas are the mo...
Trace element and Sr-Nd-Hf-Pb isotopic constraints on the composition and evolution of eastern Anatolian sub-lithospheric mantle
Aktag, Alican; Sayıt, Kaan; Peters, Bradley J.; Furman, Tanya; Rickli, Jorg (2022-11-01)
Quaternary Elazig mafic alkaline volcanism is part of the anorogenic volcanic system of the circum-Mediterranean region, and it provides crucial insights into the chemical nature of the mantle source domains beneath eastern Turkey. Elemental and isotope geochemistry reveals that these mafic lithologies are mainly free of crustal contamination, reflecting geochemical signatures inherited from partial melting of their mantle sources. The trace element and Sr-Nd-Hf-Pb isotope systematics of the most primitive ...
An example of an accretionary fore-arc basın from Northern Central Anatolia and its implicaiıons for the history of subduction of neo-tethys in Turkey
KOCYIGIT, A (1991-01-01)
Deformed sedimentary sequences of Late Cretaceous-middle Eocene age located between the Sakarya continent and the Anatolian Complex have been interpreted as the fill of a forearc basin. The history and structure of this basin are critical for understanding the evolution of the Neo-Tethyan subduction in the Middle East. I test and elaborate upon this interpretation on the basis of three basic outcrop areas of Upper Cretaceous-lower Tertiary sedimentary sequences confined to a northeast-southwest-trending b...
Geochemistry of the post-collisional Miocene mafic Tunceli Volcanics, Eastern Turkey: Implications for the nature of the mantle source and melting systematics
Aktağ, Alican; Sayıt, Kaan (2019-01-01)
The East Anatolian Accretionary Complex (EAAC) comprises an ideal example of post-collisional volcanism within the Africa-Eurasia collision zone. The Miocene mafic Tuncell Volcanics, as a part of this post-collisional volcanic system, are located in the western termination of EAAC. The mafic Tunceli Volcanics are characterized by mildly alkaline and tholeiitic basalts, in which olivine, clinopyroxene and plagioclase characterize the main mineralogy. The role of fractional crystallization (FC) and assimilati...
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.