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Petrogenesis and geodynamics of plagiogranites from Central Turkey (Ekecikdağ/Aksaray): new geochemical and isotopic data for generation in an arc basin system within the northern branch of Neotethys

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Abstract

In the Late Cretaceous, throughout the closure of the Neotethys Ocean, ophiolitic rocks from the İzmir–Ankara–Erzincan ocean branch were overthrusted the northern margin of the Tauride-Anatolide Platform. The ophiolitic rocks in the Ekecikdağ (Aksaray/Central Turkey) region typify the oceanic crust of the İzmir–Ankara–Erzincan branch of Neotethys. The gabbros in the area are cut by copious plagiogranite dykes, and both rock units are intruded by mafic dykes. The plagiogranites are leucocratic, fine- to medium-grained calc-alkaline rocks characterized mainly by plagioclase and quartz, with minor amounts of biotite, hornblende and clinopyroxene, and accessory phases of zircon, titanite, apatite and opaque minerals. They are tonalite and trondhjemite in composition with high SiO2 (69.9–75.9 wt%) and exceptionally low K2O (<0.5 wt%) contents. The plagiogranites in common with gabbros and mafic dykes show high large-ion lithophile elements/high-field strength element ratios with depletion in Nb, Ti and light rare-earth elements with respect to N-MORB. The plagiogranites together with gabbros and mafic dykes show low initial 87Sr/86Sr ratios (0.70419–0.70647), high ƐNd(T) (6.0–7.5) values with 206Pb/204Pb (18.199–18.581), 207Pb/204Pb (15.571–15.639) and 208Pb/204Pb (38.292–38.605) ratios indicating a depleted mantle source modified with a subduction component. They show similar isotopic characteristics to the other supra-subduction zone (SSZ) ophiolites in the Eastern Mediterranean to East Anatolian–Lesser Caucasus and Iran regions. It is suggested that the Ekecikdağ plagiogranite was generated in a short time interval from a depleted mantle source in a SSZ/fore-arc basin setting, and its nature was further modified by a subduction component during intra-oceanic subduction.

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Acknowledgments

Authors thank Radiogenic Isotope Laboratory of Middle East Technical University—Central Laboratory, for Sr–Nd–Pb isotope analyses. S. Köksal thanks to Prof. Dr. Rolf L. Romer for his supervision in the isotope ratio methods, Dr. Selin Süer and Sultan Atalay for their assistance during the clean laboratory facilities and Remzi Saraçoğlu for technical support. An anonymous reviewer, guest editor and Dr. Semih Gürsu are acknowledged for their constructive reviews and comments, which significantly helped to modify the manuscript. Authors thank to IGCP 589 Project leader Prof. Dr. Jin Xiaochi for encouraging us to contribute the special volume “Asian Tethyan Realm.”

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  1. Central Laboratory, R&D Research and Training Center, Radiogenic Isotope Laboratory, Middle East Technical University, Universiteler Mah. Dumlupınar Blv. No:1, 06800, Çankaya, Ankara, Turkey

    Serhat Köksal

  2. Department of Geological Engineering, Middle East Technical University, Universiteler Mah. Dumlupınar Blv. No: 1, 06800, Çankaya, Ankara, Turkey

    Fatma Toksoy-Köksal & M. Cemal Göncüoglu

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  1. Serhat Köksal
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Köksal, S., Toksoy-Köksal, F. & Göncüoglu, M. Petrogenesis and geodynamics of plagiogranites from Central Turkey (Ekecikdağ/Aksaray): new geochemical and isotopic data for generation in an arc basin system within the northern branch of Neotethys. Int J Earth Sci (Geol Rundsch) 106, 1181–1203 (2017). https://doi.org/10.1007/s00531-016-1401-5

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