A >5 km thick, north-dipping shear zone in the Pinal Peak map area, near Globe, Arizona, reveals contact metamorphism of the Pinal Schist through intrusion of the Proterozoic Madera Diorite. In Pinal Schist, sillimanite and rare andalusite occur in the metamorphic aureole around the diorite, but not elsewhere in this or adjoining map areas, where metamorphic grade is interpreted to be low greenschist facies. Deformation was synchronous in the schist and the diorite and is recorded by a well-developed, generally N- and NW-trending elongation lineation. Field interpretations of ductile deformation fabrics generally indicate top-to-the-south or reverse (present day coordinates) displacement. Microstructures in the Pinal Schist, the Madera Diorite, and the Pinal-Madera contact zone include S-C fabrics, mica "fish," asymmetric σ-type tails on porphyroclasts, and grain-shape and lattice-preferred mineral orientation, most of which indicate top-to-the-south (locally SE to SW) displacement, consistent with field ...