Evolution of mafic lavas in Central Anatolia: Mantle source domains

Furman, Tanya
Hanan, Barry B.
Sjoblom, Megan Pickard
Kürkcüoğlu, Biltan
Sayıt, Kaan
Şen, Erdal
Sen, Pinar Alici
Yurur, Tekin
We present new Sr-Nd-Pb-Hf isotopic data on mafic lavas from the Sivas, Develidag, Erciyes, and Erkilet volcanic complexes in central Turkey and Tenchirek in eastern Turkey to evaluate the mantle sources for volcanism in the context of the geodynamic evolution of the Anatolian microplate. Early Miocene through Quaternary volcanism in Western Anatolia and latest Miocene through Quaternary activity in Central Anatolia were dominated by contributions from two distinct source regions: heterogeneous metasomatized or subduction-modified lithosphere, and roughly homogeneous sublithospheric ambient upper mantle; we model the source contributions through mixing between three end members. The sublithospheric mantle source plots close to the Northern Hemisphere reference line (NHRL) with radiogenic Pb-206/Pb-204 of similar to 19.15, while the other contributions plot substantially above the NHRL in Pb isotope space. The lithospheric source is heterogeneous, resulting from variable pollution by subduction-related processes likely including direct incorporation of sediment and/or melange; its range in radiogenic isotopes is defined by regional oceanic sediment and ultrapotassic melts of the subcontinental lithospheric mantle. The geochemical impact of this contribution is disproportionately large, given that subduction-modified lithosphere and/or ocean sediment dominates the Pb isotope signatures of mafic Anatolian lavas. Subduction of the Aegean or Tethyan seafloor, associated with marked crustal shortening, took place throughout the region until ca. 16-17 Ma, after which time broad delamination of the thickened lower crust and/or the Tethyan slab beneath Central Anatolia allowed for sediment and/or melange and slab-derived fluids to be released into the overlying evolving modified mantle. Aggregation of melts derived from both mantle and lithospheric domains was made possible by upwelling of warm asthenospheric material moving around and through the complexly torn younger Aegean-Cyprean slab that dips steeply to the north beneath southern Anatolia.


Source components and magmatic processes in the genesis of Miocene to Quaternary lavas in western Turkey: constraints from HSE distribution and Hf-Pb-Os isotopes
Aldanmaz, Ercan; Pickard, Megan; Meisel, Thomas; Altunkaynak, Şafak; Sayıt, Kaan; Sen, Pinar; Hanan, Barry B.; Furman, Tanya (Springer Science and Business Media LLC, 2015-08-01)
Hf-Pb-Os isotope compositions and highly siderophile element (HSE) abundance variations are used to evaluate the mantle source characteristics and possible effects of differentiation processes in lavas from western Turkey, where the eruption of Late Miocene to Quaternary OIB-type intraplate mafic alkaline lavas followed pre-Middle Miocene convergent margin-type volcanism. Concentrations of Os, Ir, and Ru (IPGE) in the OIB-type intraplate lavas decrease with fractionation for primitive melts (MgO > 10 wt%), ...
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Demirel, Serhat; Göncüoğlu, Mehmet Cemal; Department of Geological Engineering (2004)
The aim of this study is to investigate the petrography, geochemistry and evolution of quartz-tourmaline-rich rocks occurring in a wide breccia zone within the Late Cretaceous Kerkenez Granitoid (Central Anatolian Crystalline Complex (CACC), Turkey). The approximately 40-m wide main breccia zone has a NE-SW trend and is characterized by intense cataclastic deformation. The breccia zone can be traced several kilometers towards the west and generally occurs as tourmaline-filled faults and 1mm-30cm-thick veins...
Petrogenesis of the Neogene-Quaternary mafic lavas from the Tunceli-Elazığ region (Eastern Turkey)
Aktağ, Alican; Sayıt, Kaan; Department of Geological Engineering (2022-1-27)
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 c...
Late Cretaceous stratigraphy in the Mudurnu-Goynuk Basin (Turkey) and inferences on sea-level change in the Late Campanian to Early Maastrichtian
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Upper Cretaceous strata at Goynuk, northwestern Anatolia, Turkey, provide a geological record of the Campanian-Maastrichtian from the Sakarya Terrane along the active Neotethys margin. Shales and shaly marls with siliciclastic and volcaniclastic intercalations indicate a pelagic palaeoenvironment rich in planktonic and benthonic foraminifera and calcareous nannofossil assemblages. A composite record from the Campanian to the Maastrichtian records nannofossil standard zones UC15c (CC21) to UC20a (CC26) as we...
Evolution of an early Eocene pull-apart basin in the Central Pontides (Northern Turkey): New insights into the origin of the North Anatolian Shear Zone
Ottria, Giuseppe; Pandolfi, Luca; Catanzariti, Rita; Da Prato, Simone; Ellero, Alessandro; Frassi, Chiara; Göncüoğlu, Mehmet Cemal; Marroni, Michele; Ruffini, Leonardo; Sayıt, Kaan (2017-12-01)
Although the North Anatolian Shear Zone is one of the main lithospheric-scale strike-slip deformation zone in the world, playing a prominent role in the complex geodynamic interaction among the Eurasian, Anatolian and Arabian plates, the onset time of its activity remains highly controversial. Here, we tackle this issue by utilizing nannofossil biostratigraphy on deposits from the Tacilar basin, a pull-apart basin that we have identified inside the North Anatolian Shear Zone overprinting the Intra-Pontide s...
Citation Formats
T. Furman et al., “Evolution of mafic lavas in Central Anatolia: Mantle source domains,” GEOSPHERE, vol. 17, no. 6, pp. 1631–1646, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/94969.