INTRODUCING THE BASEMENT FAULT OF ZAHAB AND ITS BEHAVIOR IN CHENGING THE TREND OF THE ROTATION OF AXIS OF ANTICLINES IN KEREND-ZABAB AREA BAKHTARAN PROVINCE, WEST OF IRAN

The observation of the trend of the rotation of axes of anticlines, and the drainage patterns also, in the Krend-Zahab area (west of Iran) suggestes so-me changes the trend of the rotation of axes of anticlines from "S" type to "Z" one. After the impression of some strike slip faults, toward the west, near Sar-e Pol-e Zahab area, there are the "Z" shape traces of fold axes, w-ith left hand transpression behavior. Also, it is obvious that the "S" shape drainage petterns are belong to the anticlines that their axes rotated in "Z" shape. This is related to the function of at least on basement fault (B-asement Fault of Zahab) that is located in the east of the city of Sar-e Po-۱-e Zahab. The numereous faults in the region of Patagh-Kerend are settled in en-echelon arrengment to the prevailed shear mechanism. So the reaction of the riedel shears is the main maker of the drainage patterns