Structural style of the eastern part of Dehsheikh peridotite massif, Esfandagheh ophiolitic mélanges, Southwest of Iran
Subject Areas :
Keywords: Esfandagheh ophiolite mé, langes Structural analysis Dehsheikh peridotite massif Zagros.,
Abstract :
The Dehsheikh peridotite massif, as a part of the Esfandagheh ophiolitic mélanges, is located in the south of Baft, Kerman province. Structural analysis of the ophiolitic complexes play an important role in understanding geodynamics of the orogenic belts. In this research, structural elements of the eastern part of the Dehsheikh peridotite massif as well as prevailing deformational patterns of the area and its relation to the Zagros orogenic belt was studied. The chromitite folds, dunitic/pyroxenitic dykes and ductile to brittle shear zones (faults and magnesite veins) constitute the principal structures of this area. Structural evidence indicate two successive tentional/transtentional and dextral transpressional deformational phases. The early D1 deformation took place in a back-arc basin during ascending of the Dehsheikh Peridotite massif. This caused emplacement of the lithospheric mantle in the low crust level, and was accompanied by deformation of the chromitites and intrusion of the dunitic/pyroxenitic dykes. The next D2 right-lateral transpressional deformation with development of the brittle-ductile shear zones accommodated emplacement of this massif in the high pressure-low tempretaure Sanandaj-Sirjan metamorphic zone.
الیاسی، م.، 1391. مبانی زمین شناسی ساختمانی، انتشارات دانشگاه تهران، 128
سبزهاي، م.، پورلطيفي، ع.، بهروزي، ا .، جعفري صدر، ع.، 1373. پديده هاي تفريق در ماگماهاي اولترابازيك. گدازههاي اولترامافيك، مافيك و اولاكوژن هاي پالئوزوييك ايران زمين. سيزدهمين گردهمايي علوم زمين، سازمان زمين‌شناسي كشور، صفحه 79-65
شیخ الاسلامی، م.ر.، حقی پور، ن.، نواب پور، پ.، نواب مطلق، ا.، کوه پیما، م.، مافی، آ.، حیدر زاده،. ق.، 1392. بررسیهای زمینشناسی و زمینساختی در پهنه کپهداغ-بینالود. پژوهشکده علوم زمین، نشر رهی، 234 .
Alavi, M., 1991. Sedimentary and structural characteristics of the Paleo-Tethys remnants in northeastern Iran. Geological Society of America Bulletin. 103, 983–992.
Boulin, J., 1988. Hercynian and Eo-cimmerian events in Afghanistan and adjoining regions. Tectonophysics 148, 235–278.
Ghazi, A, M., Hassanipak, A, A., Tucker, P.J., Mobasher, K., and Duncan, R, A., 2001. 40Ar – 39Ar Geochronology and Geochemistry of the Paleo- Tethyan Mashhad ophiolite, NE Iran. Abstract as: Eos (Transactions American Geophysical Union), 82(47), Fall Meeting
Karimpour, M.H., Farmer, L., Ashouri, C., Saadat, S., 2006. Major, Trace and REE geochemistry of Paleo- Tethys Collision- Related Granitoids from Mashhad, Iran. Journal of Sciences, Islamic Republic of Iran, 17(2) 127-145.
Lisle, R. J., and Ragan D. M., 1988. Brevia: Strain from three stretches: a simple Mohr circle solution. Journal of Structural Geology, 10, 905–906.
Madjidi, B.,1983. The geochemistry of ultrabasic and basic lava flows occurences in northern Iran, In Geodynamic project in Iran. Geological Survey of Iran, report No. 51, 436-477.
Nadai, A. 1963. Theory of Flow and Fracture of Solids. Engineering Societies Monographs. McGraw-Hill, New York. 705.
Ragan, D, M., 2009. Structural geology; An Introduction to Geometrical Techniques, fourth edition. Cambridge university Press. 602.
Ramsay, J.G., 1967, Folding and Fracturing of Rocks: McGraw-Hill, New York. 410.
#Ramsay, J.G., and Huber M.I., 1983. The Techniques of Modern Structural Geology: Volume 1:Strain Analysis: Academic Press, London. 307.
Sheikholeslami, M.R., and Kouhpeyma, M., 2012. Structural analysis and tectonic evolution of the eastern Binalud Mountains, NE Iran, Journal of Geodynamics, 61, 23-46.
Taheri, J., and Ghaemi, B., 1996. Geological Map of Mashhad, Scale 1:100,000. Geological Survey of Iran, Tehran.
Treagus, S, H., 1987. Mohr circles for strain, simplified, Geological Journal, 22, 119-132.
Zulauf, G., Gutierrez-Alonso, G., Kraus, R., Petschick, R., and Potel, S., 2011. Formation of chocolate-tablet boudins in a foreland fold and thrust belt: A case study from the external Variscides (Almograve, Portugal), Journal of Structural Geology, 33, 1639-1649.