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

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Vol17 No.3: 528-541

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

Author】Abdolreza PARTABIAN1*, Sasan BAGHERI1, Fariba MORSHEDI1, Timothy M. KUSKY2

Addresses】1 Department of Geology, College of Sciences, University of Sistan and Baluchestan, Zahedan 98167-45845, Iran; 2 Center for Global Tectonics, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Corresponding author】Abdolreza PARTABIAN

Citation】Partabian A, Bagheri S, Morshedi F, Kusky TM (2020) Documentation of the Sirjan Orocline in the southeast Sanandaj-Sirjan Zone, Iran. Journal of Mountain Science 17(3). https://doi.org/10.1007/s11629-019-5818-8

DOI】https://doi.org/10.1007/s11629-019-5818-8

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, axial-fold 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 horseshoe-shaped 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.

Keywords】Orocline; The Sanandaj-Sirjan Zone; Curved structures; Central-East Iranian Microcontinent