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Geochemical and petrological aspects of dike intrusions in the Lycian ophiolites (SW Turkey): a case study for the dike emplacement along the Tauride Belt Ophiolites

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Abstract

Lycian ophiolites located in the Western Taurides, are cut at all structural levels by dolerite and gabbro dikes. The dolerite dikes from this area are both pristine and metamorphosed. The non-metamorphosed dikes are observed both in the peridotites and in the metamorphic sole rocks. Accordingly, the non-metamorphosed dikes cutting the metamorphic sole were generated after cooling of the metamorphic sole rocks. The metamorphosed dolerite dikes are only observed in the peridotites. The physical conditions and timing of the metamorphism for the metamorphosed dolerite dikes are similar to those of the metamorphic sole rocks of the Lycian ophiolites suggesting that the metamorphosed dolerite dikes were metamorphosed together with the metamorphic sole rocks. Therefore, the dike injections in the western part of the Tauride Belt Ophiolites occurred before and after the generation of the metamorphic sole rocks. All metamorphosed and non-metamorphosed dikes are considered to have the same origin and all of them are subduction-related as inferred from whole-rock geochemistry and lead isotopes. Lead isotope compositions of whole rocks of both dike groups cluster in a narrow field in conventional Pb isotope diagrams (206Pb/204Pb = 18.40–18.64; 207Pb/204Pb = 15.56–15.58; 208Pb/204Pb = 38.23–38.56) indicating a derivation from an isotopically homogeneous source. On the 207Pb/204Pb versus 206Pb/204Pb diagram, isotope compositions of the dikes plot slightly below the orogen curve suggesting contributions from mantle reservoir enriched by subducted oceanic lithosphere. Such a signature is typical of island arc magmatic rocks and supports the formation of the investigated rocks in a subduction-related environment.

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Acknowledgments

This work is a part of the Ph.D study by Ö. F. Çelik. Ö. F. Çelik acknowledges financial support from the Swiss National Research Foundation (Projects no: 20–52294.97 and 20–058786.99). The first author thanks M. Delaloye and L. Fontbote for making available laboratory facilities at the University of Geneva, Switzerland. H. Sarp is thanked for constructive suggestions. We thank Y. Dilek and B. C. Burchfiel for their critical and constructive reviews of the paper. We also thank F. Capponi for performing major-and trace-element analyses.

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Authors and Affiliations

  1. Kocaeli Üniversitesi, Jeoloji Mühendisliği Bölümü, 41150, Kocaeli, Turkey

    Ö. F. Çelik

  2. Département de Minéralogie, Université de Genève, 1205, Geneva, Switzerland

    M. Chiaradia

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  1. Ö. F. Çelik
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  2. M. Chiaradia
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Correspondence to Ö. F. Çelik.

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Çelik, Ö.F., Chiaradia, M. Geochemical and petrological aspects of dike intrusions in the Lycian ophiolites (SW Turkey): a case study for the dike emplacement along the Tauride Belt Ophiolites. Int J Earth Sci (Geol Rundsch) 97, 1151–1164 (2008). https://doi.org/10.1007/s00531-007-0204-0

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