Geotectonics

, Volume 52, Issue 2, pp 281–296 | Cite as

Deformation Mechanisms of Darreh Sary Metapelites, Sanandaj‒Sirjan Zone, Iran

  • O. Hemmati
  • S. M. Tabatabaei Manesh
  • A. R. Nadimi
Article
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Abstract

The Darreh Sary metapelitic rocks are located in the northeast of Zagros orogenic belt and Sanandaj-Sirjan structural zone. The lithological composition of these rocks includes slate, phyllite, muscovitebiotite schist, garnet schist, staurolite-garnet schist and staurolite schist. The shale is the protolith of these metamorphic rocks, which was originated from the continental island arc tectonic setting and has been subjected to processes of Zagros orogeny. The deformation mechanisms in these rocks include bulging recrystallization (BLG), subgrain rotation recrystallization (SGR) and grain boundary migration recrystallization (GBM), which are considered as the key to estimate the deformation temperature of the rocks. The estimated ranges of deformation temperature and depth in these rocks show the temperatures of 275–375, 375–500, and >500°C and the depths of 10 to 17 km. The observed structures in these rocks such as faults, fractures and folds, often with the NW-SE direction coordinate with the structural trends of Zagros orogenic belt structures. The S-C mylonite fabrics is observed in these rocks with other microstructures such as mica fish, σ fabric and garnet deformation indicate the dextral shear deformation movements of study area. Based on the obtained results of this research, the stages of tectonic evolution of Darreh Sary area were developed.

Keywords

Metapelite Deformation mechanisms Darreh Sary Sanandaj-Sirjan zone Neotethys Iran 

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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  • O. Hemmati
    • 1
  • S. M. Tabatabaei Manesh
    • 1
  • A. R. Nadimi
    • 1
  1. 1.Department of GeologyUniversity of IsfahanIsfahanIran

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