Geochemical characteristics of the Eocene Karataş volcanics (Northeast Sivas, Turkey) in the İzmir-Ankara-Erzincan Suture Zone

Year 2020, Volume: 162 Issue: 162, 55 - 74, 15.08.2020

Oktay Canbaz , Ahmet Gökce Taner Ekici Hüseyin Yılmaz

https://doi.org/10.19111/bulletinofmre.669717

Abstract

Karataş volcanics, is the product of Eocene volcanics crop out in the form of two belts along the northern and southern boundaries of the İzmir-Ankara-Erzincan Suture Zone. According to geochemical data, these volcanics have alkaline basic-intermediate character and consist of basaltic trachyandesite, trachyandesite and trachyte. This volcanic activity has been controlled by fractional crystallization and crustal contamination from basaltic trachyandesite to trachyte. Orientation of the samples towards amphibole area on the Rb/Sr - Ba/Rb ratio diagrams, dispersion of the Zr/Ba ratios (0.08 - 0.33) in the lithospheric mantle range, increase in the Ba/Rb ratio, decreases in the MgO, Ni and Cr contents point out that this volcanism originated from enriched lithospheric mantle rather than asthenospheric mantle. Geochemical data show that this enriched lithospheric mantle material is upper continental crustal material, main part of enrichment resulted by the subduction related fluids and also the contribution of the sedimentary materials. This situation may be explained that; the melts, derived from N-MORB or OIB bearing material ascended into the continental crust in a pre-collisional period and were reactivated by extensional tectonic and/or delamination processes during the post-collisional period, possibly caused the partial melting within the upper continental crust and produced the Karataş volcanics.

Keywords

Karataş volcanics, Sivas-Zara, Eocene, Geochemistry

Thanks

This study was supported as M-613 project by the Scientific Research Projects Unit in Sivas Cumhuriyet University. We thank Dr. M. Emrah Ayaz (previous Director of Sivas Regional Directorate of MTA) and Zara field camp personnel for supplaying MTA facilities during field studies and giving MTA’s drilling data. Dr. Biltan Kürkçüoğlu (Hacettepe Univ.) and two other anonymous referees are thanked for helpful comments improved the text.

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