The Ajo Mining District, Pima County, Arizona: Evidence for middle Cenozoic detachment faulting, plutonism, volcanism, and hydrothermal alteration
Professional Paper
1733
By: Dennis P. Cox, Eric R. Force, William H. Wilkinson, Syver W. More, John S. Rivera, and Joseph L. Wooden
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Abstract
Introduction: The Ajo porphyry copper deposit and surrounding Upper Cretaceous rocks have been separated from their plutonic source and rotated by detachment faulting. Overlying middle Cenozoic sedimentary and volcanic rocks have been tilted and show evidence for two periods of rotation. Following these rotations, a granitic stock (23.7?0.2 Ma) intruded basement rocks west of the Ajo deposit. This stock was uplifted 2.5 km to expose deep-seated Na-Ca alteration.
Suggested Citation
Cox, D.P., Force, E.R., Wilkinson, W.H., More, S.W., Rivera, J.S., Wooden, J., 2006, The Ajo Mining District, Pima County, Arizona: Evidence for middle Cenozoic detachment faulting, plutonism, volcanism, and hydrothermal alteration: U.S. Geological Survey Professional Paper 1733, Report: v, 46 p.; 1 Plate, 37.00 × 37.00 inches, https://doi.org/10.3133/pp1733.
ISSN: 2330-7102 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | The Ajo Mining District, Pima County, Arizona: Evidence for middle Cenozoic detachment faulting, plutonism, volcanism, and hydrothermal alteration |
| Series title | Professional Paper |
| Series number | 1733 |
| DOI | 10.3133/pp1733 |
| Year Published | 2006 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | Western Mineral Resources |
| Description | Report: v, 46 p.; 1 Plate, 37.00 × 37.00 inches |
| Country | United States |
| State | Arizona |
| County | Pima County |
| Other Geospatial | Ajo mining district |