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Oxygen Isotope Composition of the Silicate Minerals and Chrome Ores in the Guleman Ophiolite in Southeastern Türkiye

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Abstract

Oxygen crystallising was obtained from olivine, chromite separates from host rock samples, and gabbro from ultramafic cumulates, harzburgite, and dunite samples collected from tectonites of the Guleman ophiolites. The study includes the oxygen isotope compositions from the Guleman ophiolite and the evolutionary scenarios of geochemical and isotopic signatures. The olivine and chromitite δ18Oolivine/chromite and δ18Omelt values point out these minerals and melt isotopic compositions similar to mantle values and rich, heavy stable isotopes. The highest δ18Ochromite isotopic composition values indicate that as the heavy isotope in the melt increases, the concentration in the mineral increases. Excluding a dunite sample, the values of the δ18Owhole rock of the dunite and pyroxenite samples are similar to mantle values. The gabbro samples have higher δ18Owhole rock values than the two harzburgites. Hereby, the chromite formations are the later fractional crystallisation products than olivine and dunites due to the lowering of δ18O. The lower oxygen isotopic composition in studied samples than the normal mantle values, and these values point out subducted hydrothermally alteration. The higher δ18O isotopic compositions could be explained by serpentinization on the ocean floor at low temperatures.

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ACKNOWLEDGMENTS

The authors thank Prof. Dr. Torsten Vennemann for oxygen isotope analysis at Laussane University Labs. We thank the anonymous reviewers for their helpful criticism and insightful remarks, which significantly enhanced our manuscript.

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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.

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Authors and Affiliations

  1. Fırat University, Department of Geological Engineering, 23119, Elazığ, Türkiye

    Mehmet Ali Ertürk, Hatice Kara & Leyla Kalender

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  1. Mehmet Ali Ertürk
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  2. Hatice Kara
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Correspondence to Mehmet Ali Ertürk.

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Ertürk, M.A., Kara, H. & Kalender, L. Oxygen Isotope Composition of the Silicate Minerals and Chrome Ores in the Guleman Ophiolite in Southeastern Türkiye. Dokl. Earth Sc. (2024). https://doi.org/10.1134/S1028334X23602651

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