The Laramide Mesa formation and the Ojo de Agua caldera, southeast of the Cananea copper mining district, Sonora, Mexico
Scientific Investigations Report
2006-5022
By: Dennis P. Cox, Robert J. Miller, and Keith L. Woodbourne
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Abstract
The Mesa Formation extends from Cananea, Mexico, southeast to the Sonora River and is the main host rock of Laramide porphyry copper deposits in the Cananea District and at the Alacran porphyry prospect to the east. The Mesa consists of two members-a lower andesite and an upper dacite. The lowest part of the dacite member is a crystal tuff about 100 m thick. This tuff is the outfall of a caldera centered near the village of Ojo de Agua, dated by 40Ar/39Ar at 65.8 Ma ?0.4. The Ojo de Agua Caldera is about 9 km in diameter and is filled by a light gray biotite dacite tuff with abundant flattened pumice fragments. The volume of the caldera is estimated to be 24 km3.
Suggested Citation
Cox, D.P., Miller, R.J., Woodbourne, K.L., 2006, The Laramide Mesa formation and the Ojo de Agua caldera, southeast of the Cananea copper mining district, Sonora, Mexico: U.S. Geological Survey Scientific Investigations Report 2006-5022, iii, 7p., https://doi.org/10.3133/sir20065022.
ISSN: 2328-0328 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | The Laramide Mesa formation and the Ojo de Agua caldera, southeast of the Cananea copper mining district, Sonora, Mexico |
| Series title | Scientific Investigations Report |
| Series number | 2006-5022 |
| DOI | 10.3133/sir20065022 |
| Year Published | 2006 |
| Language | ENGLISH |
| Contributing office(s) | Western Mineral Resources |
| Description | iii, 7p. |
| Online Only (Y/N) | Y |