Kinematic vorticity analysis within the Zagros hinterland involved-basement window, Tutak gneiss dome, southwestern Iran

Dehbid mylonite nappes associated with the Tutak gneiss dome as the Zagros hinterland involved-basement window in the Zagros Orogenic Belt has significant components of dextral sense of shear along the mylonite nappes and are related to the high proportion of simple shear relative to pure shear deformation. Kinematic vorticity analysis (Wk) was made in order to determination of relative amounts of simple shear and pure shear components. The kinematic vorticity analysis has taken as evidence of porphyroclasts rotation relative to internal reference frames during non-coaxial deformation within the Tutak gneiss dome in the Zagros Orogenic Belt. The quartz c-axis preferred orientation evidence used to drive the degree of non-coaxiality during deformation. The mean kinematic vorticity (Wm) value in the Tutak gneiss dome revealed contribution of 48% pure shear and 52% simple shear components. Detailed kinematic vorticity studies may allow this interpretation that the convergence between the Afro-Arabian and central Iran continental crusts is characterized by basement involvement during ongoing inclined dextral transpressional regime.