Kinematics of the Tanbour Metamorphic Complex (SE Iran): Implications for Cenozoic Metamorphism and Deformation in the Northeastern Margin of the Afro-Arabian Plate

New petrofabric studies joined with kinematic vorticity and finite strain analyses allowed to recognize the deformation characteristics of the mid-crustal rocks exposed in the the Tanbour Metamorphic Complex (Iran). Different scale sense of shear criteria in the Tanbour Metamorphic Complex reveal an...

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Published in:Geotectonics 2023-04, Vol.57 (2), p.213-229
Main Authors: Mansouri, S. M., Keshavarz, S., Shahpasandzadeh, M., Faghih, A.
Format: Article
Language:English
Subjects:
Amphibolites
Cenozoic
Deformation
Earth and Environmental Science
Earth Sciences
Kinematics
Metamorphism
Microstructure
Plates
Shear
Shear deformation
Strain analysis
Structural Geology
Vorticity
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description New petrofabric studies joined with kinematic vorticity and finite strain analyses allowed to recognize the deformation characteristics of the mid-crustal rocks exposed in the the Tanbour Metamorphic Complex (Iran). Different scale sense of shear criteria in the Tanbour Metamorphic Complex reveal an unequivocal top-to-the-SE sense of shear within this part of the Sanandaj–Sirjan metamorphic belt. Well-developed quartz c -axis within selected mylonitic samples was utilized to estimate bulk kinematic vorticity. W k values ranging from 0.65 to 0.86, thus indicating non-coaxial shear deformation with contemporaneous pure and simple shear components. Integration of microstructure- and petrofabric-based geothermometers indicates temperature of mylonitization ranges between ~450‒650°C corresponding from upper greenschist to amphibolites facies metamorphism. Data obtained support interpretations suggesting occurrence of transpressive deformation during ongoing continental collision of the Afro‒Arabian and Iranian plates.
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subjects Amphibolites
Cenozoic
Deformation
Earth and Environmental Science
Earth Sciences
Kinematics
Metamorphism
Microstructure
Plates
Shear
Shear deformation
Strain analysis
Structural Geology
Vorticity
title Kinematics of the Tanbour Metamorphic Complex (SE Iran): Implications for Cenozoic Metamorphism and Deformation in the Northeastern Margin of the Afro-Arabian Plate
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