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Geodynamic significance and genesis of chromitites from the Islahiye ophiolite (Gaziantep, SE Anatolia) as constrained by platinum group element (PGE) compositions and mineral chemistry characteristics

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Abstract

Chromitites associated with intensely altered dunites and harzburgites from fourteen different localities in the Islahiye ophiolites (SE Anatolia) is reported here for the first time. These chromitites were observed as lenticular and banded bodies with disseminated and massive textures and containing magnesiochromite grains with the following composition: Cr2O3 = 58.91–59.74 wt%, Al2O3 = 10.85–11.20 wt%, and TiO2 = 0.09–0.13 wt%. The Mg# [Mg/ (Mg + Fe2+)] values of magnesiochromite from the Islahiye ophiolite range between 0.52 and 0.60 and their Cr# [Cr/ (Cr + Al)] values vary from 0.7802 to 0.7844. These contents vary with a constant pattern, coincident with the estimated parental liquids that have originated from the derivative of a single bulk of boninitic magma together with Al, Ti-poor, and Cr-rich initial contents. The chromitites are serpentinised in almost all parts of the study area, and harzburgite and dunite can be observed in different locations. Although the overall composition of platinum group elements (PGE) in most examined chromitites varies between 97 and 191 ppb, three chromitites from the Islahiye region present enrichments in overall PGE (up to 214 ppb). The mineralogical and geochemical features of chromitites from the Islahiye region exhibit a robust similarity to podiform chromitites in the mantle fragment of supra–subduction zone type ophiolitic bodies. The estimated parental magmas of the investigated chromites are consistent with the differentiation of arc-related melts and do not suggest an oceanic spreading centre tectonic environment. The Islahiye chromites are enriched in IPGE (Ir, Os, Ru), with the occasional presence of Ru and Ir and higher Os contents in chromite. Furthermore, we did not find any platinum group minerals (PGM) associated with the serpentine silicate sample matrix, which would have stated a secondary enrichment in PGEs. All chromitites in the investigated region have high Cr and low Ti values, are defined as magnesiochromite and were crystallised from a characteristic boninitic magma.

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Acknowledgements

This paper is based on the M.Sc. study of the second author. The authors would like to thank Çukurova University Research Foundation for their support (Project No: FYL-2018-10437; FBA-2021-13093). The authors would like to give special thanks to Dr. Andrew LOCOCK (Alberta University, CANADA) for performing mineral chemistry analyses. The authors are also indebted to the anonymous reviewers and the editor of the journal for their constructive comments and suggestions, which greatly helped to improve the manuscript.

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Authors and Affiliations

  1. Department of Mining Engineering, University of Çukurova, Adana, Turkey

    Nil Yapici & Gael Calo sinda Ngbangandimbo

  2. Department of Geological Engineering, University of Çukurova, Adana, Turkey

    Nusret Nurlu

  3. Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, Çukurova Üniversitesi, 01330 Balcalı, Adana, Turkey

    Nusret Nurlu

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  1. Nil Yapici
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  2. Gael Calo sinda Ngbangandimbo
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Nil YAPICI: Conceptualization, data collection, investigation, validation, writing review and editing. Gael Calo sinda NGBANGANDIMBO: Conceptualization, data collection, writing original draft, formal analysis, and methodology. Nusret NURLU: Conceptualization, data collection, writing original draft, formal analysis, and methodology.

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Correspondence to Nusret Nurlu.

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Yapici, N., sinda Ngbangandimbo, G.C. & Nurlu, N. Geodynamic significance and genesis of chromitites from the Islahiye ophiolite (Gaziantep, SE Anatolia) as constrained by platinum group element (PGE) compositions and mineral chemistry characteristics. Acta Geochim 41, 741–752 (2022). https://doi.org/10.1007/s11631-022-00541-2

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