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Supra-subduction zone mantle peridotites in the Tethyan Ocean (East Anatolian Accretionary Complex–Eastern Turkey): Petrological evidence for melting and melt-rock interaction

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Abstract

The East Anatolian Accretionary Complex formed as a result of the natural process of collision between the Arabian and Eurasian plates and the subduction of the Neotethys oceanic lithosphere located between them, covers a broad area, largely east of Lake Van. This study presents new information about the formation environment of mantle peridotites located within the East Anatolian Accretionary Complex and its rock-melt interactions. According to petrographic and geochemical investigations, peridotites comprise olivine, orthopyroxene, and chromite with low modal content in clinopyroxene (<1 vol%) while whole rock geochemical data indicates that they contain a high MgO (40.56–43.31 wt%) and low Al2O3 (0.16–0.48 wt%) and CaO (0.02–0.38 wt%) content. These values show that these rocks have a high degree of depletion, revealing typical arc peridotite features. Studies on olivine and pyroxene minerals, which are commonly observed in peridotites, show that these rocks are related to the arc. When peridotites are normalized to chondrite, partial enrichment takes place in light and heavy rare earth elements, while partial depletion occurs in medium rare earth elements. The enrichment of the rare earth elements is considered sufficient proof that the mantle peridotites underwent a boninitic mantle-induced enrichment during subduction. Analysis of chromites in the main melt, and its contents (Al2O3, TiO2 and FeO/MgO) suggest boninitic effects in peridotites. All data obtained from peridotites reveal formation of a subduction zone within the Neotethys oceanic lithosphere with an advanced degree of melting leading to re-enrichment of forearc peridotites in advancing periods. These features compare with southern Neotethys and Iran ophiolites.

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taken from Pearce et al. 1992), b) MgO vs Al2O3 diagram in mantle peridotite (The consumption direction and partial melting from the primary mantle were taken from Niu 1997), c) SiO2 vs. MgO/SiO2 ratios in mantle peridotites. The depletion trend of the primitive mantle and the olivine (Ol)–orthopyroxene (Opx)/clinopyroxene (Cpx) mixing trends are from Walter (1998), d) Cr (chr) vs Al2O3 and CaO in mantle peridotites

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Acknowledgements

This study has been supported by project number 2015-MİM-B084 of the Department of Scientific Research Projects of Van Yüzüncü Yil University.

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Üner, T. Supra-subduction zone mantle peridotites in the Tethyan Ocean (East Anatolian Accretionary Complex–Eastern Turkey): Petrological evidence for melting and melt-rock interaction. Miner Petrol 115, 663–685 (2021). https://doi.org/10.1007/s00710-021-00760-0

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