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Emplacement of serpentinites in the Chohar Gonbad-Gugher-Baft ophiolitic mélange, southeast Iran: examination of the mineral–chemical, petrologic, and structural features

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Abstract

The Chohar Gonbad-Gugher-Baft ophiolite mélange, located along the major Baft and Shahr-e-Babak fault zones, southeast Iran, represents remnants of Neo-Tethyan oceanic lithosphere. This mélange contains blocks of harzburgite, dunite, lherzolite, basalt, and other ophiolite-related lithologies tectonically mixed with and embedded in a serpentinite matrix. Field, petrographic, and geochemical data show that peridotites in this mélange belong to the upper mantle. They seem to have undergone up to ~20 % partial melting in a supra-subduction zone setting, based on their spinel Cr# values (0.21–0.53). Chemical compositions and textures in the serpentinites indicate that they were partially hydrated during emplacement and further mobilized diapirically to the surface. The different deformation stages occurred in an accretionary wedge environment. Petrographic evidence shows that the first serpentinization event produced mesh-textured serpentinites formed under static conditions in an ocean floor environment (Nain-Baft ocean crust), where the initial lizardite, bastite, and chrysotile veins formed. Plastic deformation occurred due to the subduction of Nain-Baft oceanic lithospheric beneath the central Iranian microcontinent, with antigorite-bearing flare-textured serpentinites produced. During progressive exhumation of the Nain-Baft ophiolite mélange, the serpentinites were affected by ductile, ductile–brittle, and brittle deformation, respectively. Accretion and resultant diapirism are the most important processes in the emplacement of serpentinite, which is a consequence of hydration of the ocean crust. In this example, late-stage emplacement via thrusting occurred along the northern extent of the southern Sanandaj–Sirjan zone (S–SZ).

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Acknowledgments

The authors are grateful to Professor H.G. Stosch and Dr. F. Daliran (from Karlsruhe University, Germany) and Dr. S. Peighambary (from Payem Noor University, Tehran, Iran) for their kind help in performing microprobe analyses and BSE images. Thanks to Dr. Douglas Hall (University of New Brunswick) for performing the new microprobe analyses and obtaining the related BSE images. We really appreciate the thorough reviews of Dr. Paul Robinson, Dr. Laurence Hopkinson, and the editor, Professor Wolf-Christian Dullo, for the editorial handling. The authors also wish to acknowledge Dr. D. Laó-Dávila (from Oklahoma State University, USA) for his helpful remarks, comments, and suggestions, and all other people who supported us in this research. DL is supported by a NSERC Discovery grant.

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Authors and Affiliations

  1. Department of Earth Sciences, University of New Brunswick, 2 Bailey Drive, Fredericton, NB, E3B 5A3, Canada

    N. Mohammadi & D. R. Lentz

  2. Department of Geology, Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Islamic Republic of Iran

    H. Ahmadipour

  3. School of Earth Sciences, Damghan University of Basic Sciences, Damghan, Iran

    H. Shafaii Moghadam

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  1. N. Mohammadi
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Correspondence to N. Mohammadi.

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Mohammadi, N., Ahmadipour, H., Lentz, D.R. et al. Emplacement of serpentinites in the Chohar Gonbad-Gugher-Baft ophiolitic mélange, southeast Iran: examination of the mineral–chemical, petrologic, and structural features. Int J Earth Sci (Geol Rundsch) 105, 537–555 (2016). https://doi.org/10.1007/s00531-015-1187-x

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