Development of structures in a shear stress regime in East Dasht-e Bayaz Fault Zone (East of Iran)

In this study, the development of structural elements and the relationship between these elements and dikes emplacements investigated by the field surveys and analysis of satellite images of the East Dasht-e Bayaz Fault Zone. In this area NNW-SSE (T₂) and NW-SE trending dikes are which follow the fractures of the region. We measured geometric characters of dikes (such as thickness, attitude, dip, …) also major and minor faults or related fractures recognized. The Riedel fractures (R), which depend on the major faults, with NE-SW trending and with sinistral components have cut and displaced the NW-SE dikes. There are two folds traces in the region, NE-SW (C₂) which is perpendicular to T2 fractures and the syncline Hatam Abad (with NE-SW fold trace) which is perpendicular to NW-SE dikes. On the other hand, the change of main stress trend (σ₁) from NW-SE to NE-SW proves the existence of rotation in fault parallel simple shear.