Middle Tertiary plutonism in the Santa Catalina and Tortolita Mountains, Arizona
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Abstract
Recent reconnaissance geologic mapping in the Santa Catalina and Tortolita Mountains of southeastern Arizona, supplemented by new and published potassium-argon and fission-track ages, suggests that a large middle Tertiary (about 25 m.y.) composite batholith crops out extensively in both mountains. More than two-thirds of the batholith and the contiguous wallrocks are gneissic, the gneissosity comprising strong cataclasis and mylonitization, penetrative planar and linear structures, and crystallization of muscovite and biotite in the foliation planes. New radiometric ages indicate the deformation followed the crystallization of the batholith so closely that the K-Ar dating method cannot distinguish a difference, whereas previously published ages from the gneisses indicate a short time interval between the two events.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Middle Tertiary plutonism in the Santa Catalina and Tortolita Mountains, Arizona |
| Series title | Open-File Report |
| Series number | 76-262 |
| DOI | 10.3133/ofr76262 |
| Year Published | 1976 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | ii, 20 p. |
| Country | United States |
| State | Arizona |
| Other Geospatial | Santa Catalina Mountains, Tortolita Mountains |
| Google Analytic Metrics | Metrics page |