K-Ar age of alunite alteration at Red Mountain, Lake City area, western San Juan Mountains, Colorado
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Abstract
The San Juan Mountains of southwestern Colorado are famous for rich vein deposits of base and precious metals and for patterns of conspicuous hydrothermal alteration. Areas of acid-sulfate alteration, characterized by extensive base leaching of volcanic rocks or hypabyssal plutons, are of current interest because of their local association with Au, Ag, and, in some cases, U mineralization (Lipman and others, 1976; Cunningham and others, 1978; Steven and others, 1979). Potential may also exist for recovery of aluminum from altered rocks rich in alunite (Hall, 1978). Alunite has been shown to be suitable for K-Ar dating in other mining districts (Mehnert and others, 1973b; Ashley and Silberman, 1976). We report here two concordant K-Ar ages determined on hydrothermal alunite from Red Mountain, in the Lake City area of the western San Juan Mountains.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | K-Ar age of alunite alteration at Red Mountain, Lake City area, western San Juan Mountains, Colorado |
| Series title | Open-File Report |
| Series number | 79-1642 |
| DOI | 10.3133/ofr791642 |
| Year Published | 1979 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | Eastern Mineral and Environmental Resources Science Center |
| Description | 8 p. |
| Country | United States |
| State | Colorado |
| County | Lake City |
| Other Geospatial | Red Mountain, San Juan Mountains |
| Google Analytic Metrics | Metrics page |