Structural Analysis of the Cove Wash Section of the Mogul Fault, Pinal County, Arizona

• Main Author: Munoz, Juan Jose
• Other Authors: Davis, George H.
• Language: en_US
• Published: The University of Arizona. 2015
• Online Access: http://hdl.handle.net/10150/578949

A structural analysis was carried out across on a transect of the eastern part of the Mogul fault along the Charlouleau Gap Road, located in southern Pinal County, Arizona, to examine how the increased presence of the Pinal Schist along the eastern segment of the exposed fault influenced the faulting along this section. Changes in foliation orientation within the Pinal Schist were observed and measured. The data base evaluated included hundreds of foliation orientation measurements taken and reported by Jinks (1961) in his University of Arizona M.S. thesis. The two sets of observations and orientations revealed that the orientations of the foliation within the Pinal Schist are notably different within the eastern segment of the fault versus the western. It was also found that a section of mylonitized Oracle Granite and highly sheared Pinal Schist crop out on the eastern segment of the fault, contrary to past observations that such mylonitic fabrics were exclusively found within the western segment of the fault. The overall geometry of ‘dragged and rotated foliations in the Pinal Schist in the eastern segment of the Mogul fault reinforces Jinks'(1961) interpretation that the kinematic history of this shear zone included left handed shear.