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Structural evolution of the western part of Dehsheikh Ultramafic-Mafic complex, Esfandagheh-Faryab ophiolitic mélange belt

Document Type : Original Research Paper

Authors

1 M.Sc., Department of Earth Sciences, Graduate University of Advanced Technology, Kerman, Iran

2 Head of Earth Sciences Department, College of Science and Modern Technologies, Graduate University of Advanced Technology, Kerman, Iran

3 Assistant Professor, Department of Ecology, The Environmental Sciences Research Institute, Graduate University of Advanced Technology, Kerman, Iran

4 Associate Professor, Department of Geology, Shahid Bahonar University, Kerman, Iran

Abstract

The Dehsheikh Ultramafic-Mafic Complex (DUMC), as a portion of the Esfandagheh-Faryab ophiolitic melange belt, accommodates several chromitite ore deposits, but their emplacement and relation to the regional structures remain ambiguous due to structural complexities. The Dehsheikh Ultramafic Massif is composed of harzburgites, dunites, chromitites, pyroxenites, and lherzolites. The chromitite ores, embedded in a dunitic host rock, are concentrated in the central part of the massif in the active Bozorg mine and also abandoned Ajdari and Konar mines. According to the results, the DUMC has experienced three deformational phases of D1-D3. The high-T transtenssional D1 deformation is recognized by injection of the pyroxenitic dykes (Di1), development of the dextral ductile shear zones (Dsz1) and rootless folds (F1) in the dunite-chromitites sequences. These evidences could demonstrate ascending of the Dehsheikh mantle diapir in the upper mantle during the D1 deformation. The D2 dextral transpressional deformation is characterized by formation of the conjugate F1b right-lateral strike slip faults (with reverse component) and F1a thrusts and associated V1 magnesite veins. The D2 structures developed along with emplacement of the DUMC under the prevalent Zagros oblique reverse faulting in the ophiolitic mélange belt. Finally, the D3 was accompanied by conjugate F2a right-lateral strike slip faults (with normal component) and F2b normal faults, associated with development of the V2 magnesite veins under the local transtenssional regime along the Zagros fault. The F1 folds and F1-F2a,b faults structurally controlled deformation and emplacement of the chromitite ore deposits.  

Keywords

References
References
Alavi, M., Vaziri, H., Seyed-Emami, K. and Lasemi, Y., 1997- The Triassic and associated rocks of the Nakhlak and Aghdarband areas in central and northeastern Iran as remnants of the southern Turanian active continental margin, Geological Society of America Bulletin 12, 1563–1575.  
Behzadi, K. H. and Shahabpour, J., 2011- An emplacement model for Esfandagheh and Faryab ultramafic-mafic complexes, Kerman province, south east Iran. Neues Jahrbuch für Geologie und Paläontologie – Abhandlungen 262/1, 25–42.
Berberian, M. and King, G. C. P., 1981-Towards a palaeogeography and tectonic evolution of Iran. Can. J. Earth Sci 18, 210–265.
Ghasemi, H., Juteau, T., Bellon, H., Sabzehei, M., Whitechurch, H. and Ricou, L. E., 2002- The mafic–ultramafic complex of Sikhuran (central Iran): a polygenetic ophiolite suite. Comptes Rendus Geoscience 334, 431–438.
Ghazi, J. M., Rahgoshay, M., Shafaii Moghadam, H. and Moazzen, M., 2010- Geochemistry of gabbroic pockets of a mantle sequence in the Nain ophiolite (Central Iran): constraints on petrogenesis and tectonic setting of the ophiolite. Neues Jahrbuch. Für Mineralogie –Abhandlungen187/1, 49–62.
Huang, X., Li, J., Kusky, T. M. and Chen, Z., 2004- Microstructures of the 2.50 Ga podiform Chromite, North China craton and implicatins for the deformation and rheology of the Archean oceanic lithospheric mantle, Developments in Precambrian Geology 13, 321-337.
Moores, E. M., 1986- The Proterozoic ophiolite problem, continental emergence and Venus connection, Science 234, 65-68.
Najafzadeh, A. and Ahmadipour H., 2014- Using platinum-group elements and Au geochemistry to constrain the genesis of podiform chromitites and associated peridotites from the Soghan mafic–ultramafic complex, Kerman, Southeastern Iran, Ore Geology Reviews 60, 60–75.
Peighambari, S., Ahmadipour, H., Stosch, H. G. and Daliran, F., 2011- Evidence for multi-stage mantle metasomatism at the Dehsheikh peridotite massif and chromite deposits of the Orzuieh coloured mélange belt, southeastern Iran. Ore Geology Reviews 39, 245–264.
Robertson, A. H. F., 2007- Overview of tectonic settings related to the rifting and opening of Mesozoic ocean basins in the Eastern Tethys: Oman, Himalayas and Eastern Mediterranean regions. In: Karner, G., Manatschal, G., Pinheiro, L. (Eds.), Imaging, Mapping and Modelling Continental Lithosphere Extension and Breakup. Geol. Soc. London Spec. Publ 282, 325–389.
Saccani, E., Allahyari, K., Beccaluva, L. and Bianchini, G., 2013- Geochemistry and petrology of the Kermanshah ophiolites (Iran): implication for the interaction between passive rifting, oceanic accretion, and plume-components in the Southern Neo-Tethys Ocean. Gondwana Res 24, 392–411.
Sarkarinejad, Kh., Faghih, A. and Grasemann, B., 2008- Transpressional deformations within the Sanandaj–Sirjan metamorphic belt (Zagros Mountains, Iran), Journal of Structural Geology, 30, 818-826.
Sengor, A. M. C., Altlner, D., Cin, A., Ustaomer, T. and Hsu, K. J., 1988- Origin and assembly of the Tethyside orogenic collage at the expense of Gondwana Land. In: Audley-Charles, M.G., Hallam, A.E. (Eds.), Gondwana and Tethys. Geol. Soc. London Spec. Publ 37, 119–181.
Scientific Quarterly Journal of Geosciences
Volume 27, Issue 108
September 2018
Pages 201-212
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