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Tectonic implication of quantitative micro-fabric analyses of quartz c-axis development within the Tutak gneiss dome, Zagros hinterland fold-and-thrust belt

  • Mina ShoorangizEmail author
  • Khalil Sarkarinejad
  • Ahmad Nourbakhsh
  • Leila Hashemi Dehsarvi
Original Paper

Abstract

Quartz c-axis fabrics, finite strain, and kinematic vorticity number analyses were used to investigate deformation characteristics of the Tutak gneiss dome located in the eastern edge of the basement-involved Zagros hinterland fold-and-thrust belt. The opening angle of the quartz c-axis fabric patterns was used to estimate deformation temperatures, which suggest greenschist-to-amphibolite-facies conditions (430 ± 50 °C to 660 ± 50 °C). The kinematic vorticity number varies from 0.6 to 0.95 (mean kinematic vorticity number of 0.81), which indicates that the metamorphic rocks of the Tutak gneiss dome experienced a sub-simple shear regime by contribution of both pure shear (39%) and simple shear (61%) deformation components. NW–SE-striking foliations have commonly SW and NE dips accompanied by mostly NW–SE-plunging and subordinate NE–SW-plunging-stretching lineations. These indicate more extension along the NW–SE trend to produce a prolate elliptical wedge shape in map view. Structural and vorticity analysis suggests that the Tutak gneiss dome has experienced earlier dome formation followed by thrust stacking rather than the two deformations occurring synchronously, and a protracted progressive deformation through a decreasing temperature regime.

Keywords

Quartz c-axis fabrics Kinematic vorticity number Deformation temperature Tutak gneiss dome Zagros 

Notes

Acknowledgements

This work is part of a Ph.D. thesis undertaken by Mina Shoorangiz at the Department of Earth Sciences, Shiraz University, Iran. Authors would like to thank the editor Prof. Wolf-Christian Dullo for his editorial authority. Also, we gratefully acknowledge constructive Dr. Alan Boyle (University of Liverpool) and Dr. Eugenio Fazio (University of Catania) by the reviewer, which helped to considerably improve the scientific content and presentation of the manuscript. The Research Council of the Shiraz University (RCSU) has supported this study, which is gratefully acknowledged.

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© Geologische Vereinigung e.V. (GV) 2019

Authors and Affiliations

  • Mina Shoorangiz
    • 1
    Email author
  • Khalil Sarkarinejad
    • 1
  • Ahmad Nourbakhsh
    • 1
  • Leila Hashemi Dehsarvi
    • 1
  1. 1.Department of Earth Sciences, College of SciencesShiraz UniversityShirazIran

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