Structural Evolution of Khorramabad anticline

Khorramabad's anticline with its overturned southern limb and NW-SE trend is located near Khorramabad city, in Zagros fold-thrust belt. Three structural cross sections with NE-SW trend was determined and desired structural data (strike and dip) of structures including fault, parasitic folds, and joints were obtained. For geometric analysis, and to determine the folding type related to the thrust faults, different Jamison`s diagrams were used. Results of this study suggest that the geometry of khoramabad's anticline is similar to Fault Propagation Folding and Faulted Detachment Folding. High Zagros Fault in this area, which is known as Khorramabad Thrust, passes from the south of Khorramabad anticline and is the main factor for generation of Khorramabad anticline