Geologic Map of the Buehman Canyon Area, Pima County, Arizona

Geologic map with stratigraphy of the Buehman Canyon area. Map scale 1:6,000.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]

Geologic map of the southeastern Santa Catalina Mountains, Pima County, Arizona

Geologic map of the southeastern Catalina Mountains, Pima County, Arizona. Two map sheets, map scale at 1:24,000, second map sheet includes three cross-sections. Parts of four USGS topographic quadrangle are included in the mapping.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]

Geologic Map of the Buehman Canyon Area, Pima County, Arizona

Geologic map with stratigraphy of the Buehman Canyon area. Map scale 1:6,000.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected])

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

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

Discovery of Major Basement-Cored Uplifts in the Northern Galiuro Mountains, Southeastern Arizona: Implications for Regional Laramide Deformation Style and Structural Evolution

The Laramide orogeny is poorly understood in southeastern Arizona, largely because of complex structural overprinting by mid-Cenozoic extension that occurred over large areas. This study integrates new geological mapping with previous work, combined with structural reconstructions and forward modeling, to determine the primary structural style, timing, evolution, and kinematics of Laramide shortening in the northern Galiuro Mountains. Cenozoic normal faulting in the study area is minor and has only resulted in up to 13 degrees of eastward tilting, as indicated by the gentle dips of synextensional strata. Detailed mapping has revealed newly identified reverse fault systems measuring at least 50km in combined strike length. Each major fault strikes north-northwest, dips moderately to the west, places older rocks on younger, and has related fault-propagation folds. Once restored to their original orientation, reverse faults range in dip from 38 degrees to 47 degrees. These moderate dips of faults combined with related folds, the significant degree of basement involvement, and cover sequence lacking obvious penetrative deformation indicate that these faults are thick-skinned, basement-cored uplifts. Forward modeling and Cenozoic erosion surfaces suggest regionally extensive Laramide-age tilting to the west-southwest and gentle folding, possibly caused by a regional-scale reverse fault underlying the study area. These results are consistent with the interpretation that Laramide shortening in southeastern Arizona was primarily characterized by thick-skinned tectonics. Kinematic indicators, folded basement rocks, north-northwest strikes of reverse faults, and lack of evidence for basin inversion suggest that preexisting basement faults and fabrics had little or no effect on the subsequent structural evolution. Plain Language Summary The Late Cretaceous to early Eocene Laramide orogeny was a period of crustal shortening in the North American Cordillera that involved two different styles of reverse faulting. One style involves low-angle thrusts that typically slip parallel to bedding planes in layered rocks, whereas the other style involves faults that cut across bedding at moderate angles and continue downward through underlying crystalline basement rock. In southeastern Arizona, the style of Laramide shortening is debated and not well understood, in part because most of the region has undergone subsequent Cenozoic extension that has significantly rotated, dismembered, and buried most faults formed during Laramide crustal shortening. This study examines a newly discovered set of Laramide reverse faults that extend for more than 50km along strike and that have only been affected by minor extension. Results from field mapping and structural modeling indicate that these faults are basement-involved, moderate-angle reverse faults. Because the upper crustal architecture across the region is largely consistent, the region as a whole may be characterized by moderate-angle reverse faults. Thus, nearby Laramide faults that have been previously interpreted as low-angle thrusts deserve reexamination.Lowell Institute for Mineral Resources at the University of Arizona; Arizona Geological Society J. Harold Courtright Scholarship6 month embargo; published online: 23 September 2018This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]