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Documentation of the Sirjan Orocline in the southeast Sanandaj-Sirjan Zone, Iran

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Abstract

At the southeastern part of the Sanandaj-Sirjan Zone of Iran, a group of structural elements outline a large-scale arc curvature around a vertical axis. This curvature comprises several elongated structural elements and their dividing faults, axialfold traces, layering, and foliation. The most frequent lithological units include Paleozoic metamorphic rocks, Mesozoic-Paleogene sedimentary rocks, and Mesozoic magmatic-ophiolitic complex disposed in several anticlines and synclines, forming a horseshoeshaped structure with a 240-km arc length and a 90-km wavelength. We name this structure the Sirjan Orocline, and characterize this structure here through field observations and satellite image analyses. The Sirjan Orocline formed during the late Eocene-Oligocene related to the most significant deformation event after regional metamorphism. The final form of this structural arc is affected by a younger tectonic event that compressed and transected this structure.

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Acknowledgments

This work was supported by Research Council of University of Sistan and Baluchestan, Zahedan, Iran. Authors are grateful to editors and anonymous reviewers for their careful reading of our manuscript and many constructive suggestions.

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Authors and Affiliations

  1. Department of Geology, College of Sciences, University of Sistan and Baluchestan, Zahedan, 98167-45845, Iran

    Abdolreza Partabian, Sasan Bagheri & Fariba Morshedi

  2. Center for Global Tectonics, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China

    Timothy M. Kusky

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  1. Abdolreza Partabian
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Correspondence to Abdolreza Partabian.

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Partabian, A., Bagheri, S., Morshedi, F. et al. Documentation of the Sirjan Orocline in the southeast Sanandaj-Sirjan Zone, Iran. J. Mt. Sci. 17, 528–541 (2020). https://doi.org/10.1007/s11629-019-5818-8

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