Abstract
The basal decollement Darizhan shear zone in the hinterland of the Zagros orogenic belt exposes the amphibolite-mylonite in NW Iran. In this study, I discuss the deformation partitioning in terms of oblique convergence between the Afro-Arabian continent and the Iranian microcontinent. Rf/ $$\phi $$ -based finite strain analysis, Rxz varies ranging from 2.25 to 3.04 for the XZ-plane of the strain ellipsoid. The flow vorticity (Wm) along the Darizhun shear zone is estimated employing PHD, PAR, RGN and PD techniques. The Wm estimates vary between 0.6 and 0.85 and demonstrate general shear deformation (pure-shear: 35–58% and simple-shear: 42–65%). The Wm values indicate a gradual increase in the simple-shear component towards the Darizhan thrust sheet. Considering both the results of strain and vorticity analyses, we propose a horizontal shortening of (~ 21–36%) normal to the walls of the shear zone.
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