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Kinematic analysis of rock flow and deformation temperature of the Sirjan thrust sheet, Zagros Orogen, Iran

Published online by Cambridge University Press:  04 February 2016

KHALIL SARKARINEJAD ,
SAEEDE KESHAVARZ ,
ALI FAGHIH  and
BABAK SAMANI
KHALIL SARKARINEJAD
Affiliation:
Department of Earth Sciences, College of Sciences, Shiraz University, Shiraz, Iran
SAEEDE KESHAVARZ*
Affiliation:
Department of Earth Sciences, College of Sciences, Shiraz University, Shiraz, Iran
ALI FAGHIH
Affiliation:
Department of Earth Sciences, College of Sciences, Shiraz University, Shiraz, Iran
BABAK SAMANI
Affiliation:
Faculty of Earth Sciences, Shahid Chamran University, Ahvaz, Iran
*
†Author for correspondence: s.keshavarz2007@yahoo.com
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Abstract

Microstructural, finite strain and vorticity analyses of quartz-rich mylonites were used in order to investigate kinematics of rock flow and deformation temperature in the Sirjan thrust sheet exposed in a structural window within the Sanandaj–Sirjan High Pressure – Low Temperature (HP–LT) metamorphic belt that forms part of the hinterland of the Zagros orogenic belt of Iran. A dominant top-to-the-SW sense of shear in the study area is indicated by several shear sense indicators such as asymmetric boudins, rotated porphyroclasts, mica fish and S/C fabrics. Quantitative analyses reveal approximately plane strain deformation conditions with Rxz values ranging from 2.5 to 4.3 and increasing towards the Sirjan thrust. Opening angles of quartz c-axis fabrics and recrystallization regimes suggest deformation temperatures vary from 430 to 625 ± 50°C in the hanging wall rocks. Oblique grain shape and quartz c-axis fabrics were used to estimate the degree of non-coaxiality during deformation. The obtained vorticity profile indicates a down-section increase in kinematic vorticity number (Wm) from 0.6 to 0.89. This range of vorticity numbers confirms contributions of both simple (41–68 %) and pure shear (32–59 %) deformation components. The structural characteristics of the study area ultimately were controlled by oblique motion of the Afro-Arabian plate relative to the Iranian plate.

Keywords

vorticity analysisdeformation temperaturefinite strainquartz fabricsZagros
Type
Original Articles
Information
Geological Magazine , Volume 154 , Issue 1 , January 2017 , pp. 147 - 165
Copyright
Copyright © Cambridge University Press 2016 

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