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Geochemical, mineralogical and Re-Os isotopic constraints on the origin of Tethyan oceanic mantle and crustal rocks from the Central Pontides, northern Turkey

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Abstract

Chromite, ultramafic and mafic rocks from Eldivan, Yapraklı, Ayli Dağ, Küre, Elekdağ and Kızılırmak in northern Turkey have been studied to determine their mineral and whole-rock geochemical, and Re-Os isotope geochemical characteristics. Most of the studied peridotites display depleted but commonly V-shaped chondrite-normalized rare-earth element (REE) patterns while some peridotites as well as pyroxenites from all areas exhibit light REE depleted patterns. Olivine (forsterite 82 to 92 mol%) and spinel (chromium number 13 to 63) in the studied peridotites exhibit a wide range of compositions. Compositions of spinels suggest that peridotites from Eldivan, Ayli Dağ and Küre experienced relatively large degrees of partial melting (~ 15 and 19 wt%), whereas those of the Kızılırmak area most likely reflect lower melting degrees (~ 4–6 wt%). Whole-rock and mineral chemical data indicate that the ultramafic rocks are similar to abyssal and supra-subduction zone peridotites. The ultramafic rocks of the investigated areas exhibit a wide range of 187Re/188Os (0.12 to 6.6) and measured 187Os/188Os (0.122–1.14), while the basaltic rocks from Küre, Eldivan and Kızılırmak areas have high 187Re/188Os (128–562) and measured 187Os/188Os (0.724–1.943). On the other hand, chromite from Eldivan, Elekdağ and Kızılırmak show high Os contents (21.81–44.04 ppb) and low 187Re/188Os (0.015–0.818) and 187Os/188Os (0.122–0.133). Re-Os model ages (TChur) for all analyzed samples yielded scattered ages ranging from Jurassic to Proterozoic. Overall, geochemical data are interpreted to reflect different degrees of partial melting, melt – rock interactions and metasomatic effects that produced a heterogeneous mantle in a supra-subduction setting.

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Acknowledgments

Mutlu Özkan, İsmail Emir Altıntaş, Mehmet Hanefi İnce are thanked for their assistance during field work. Raul Carampin (IGG-CNR, Padova) is thanked for assistance during EPMA analysis. Sergio Salgado Souto is thanked for assistance during Re-Os isotope analyses. The chemical analyses were done at the GeoAnalytical Center, Washington State University, Pullman, ACME Analytical Laboratories, Vancouver, and Activation Laboratories Ltd. (ACTLABS), Ancaster, and N-TIMS analyses were done at the University of Arizona, Tucson. This paper benefited from comments of two anonymous reviewers and handling editor Quili Li. The research presented in this paper was funded by the TÜBİTAK, project no 106Y222.

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  1. Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, Kocaeli Üniversitesi, 41380, Kocaeli, Turkey

    Ömer Faruk Çelik

  2. Dipartimento di Geoscienze, Università di Padova, and IGG-CNR, 35100, Padova, Italy

    Andrea Marzoli

  3. Department of Earth and Enviromental Sciences, Ludwig-Maximilians Universität München, 80333, Munich, Germany

    Robert Marschik

  4. Section des Sciences de la Terre et de l’Environnement, University of Geneva, 1205, Geneva, CH, Switzerland

    Massimo Chiaradia

  5. Department of Geology, Juniata College, Huntingdon, PA, 16652, USA

    Ryan Mathur

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Çelik, Ö.F., Marzoli, A., Marschik, R. et al. Geochemical, mineralogical and Re-Os isotopic constraints on the origin of Tethyan oceanic mantle and crustal rocks from the Central Pontides, northern Turkey. Miner Petrol 112, 25–44 (2018). https://doi.org/10.1007/s00710-017-0519-x

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