Late Cretaceous to Early Tertiaryductile deformation: Catalina-Rincon metamorphic core complex, southeasternArizona

Document Type

Article

Journal/Book Title/Conference

Geology

Volume

15

Publisher

Geological Society of America

Publication Date

1987

First Page

462

Last Page

465

Abstract

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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