Detailed mapping and kinematic analysis have revealed east-vergent Late Cretaceous to early Tertiary ductile deformation in the eastern Santa Catalina Mountains within the Catalina-Rincon metamorphic core complex. A gently dipping tectonite fabric formed concurrently with greenschist to amphibolite facies metamorphism in Precambrian through Upper Cretaceous sedimentary and plutonic rocks. The tectonites contrast in age, lineation orientation, shear sense, and deformational style with younger mid-Tertiary mylonites that are kinematically coordinated with the detachment fault. The Late Cretaceous to early Tertiary deformation may reflect crustal thickening prior to mid-Tertiary extension of the complex.

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