Mineral resources and resource potential map of the Pyramid Peak Roadless Area, Riverside County, California
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- Plate: Plate 1 (pdf)
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Abstract
The Pyramid Peak Roadless Area is underlain by mid-Cretaceous plutonic rocks (granite, granodiorite, and tonalite) that intrude metasedimentary rocks of the Desert Divide Group. The granodiorite grades eastward into strongly deformed mylonitic rocks mapped as part of the Santa Rosa mylonite zone. Metasedimentary rocks, orthogneiss, and anatexites of the Palm Canyon Complex were displaced westward over the Santa Rosa mylonite zone along low-angle thrust faults that are nearly synchronous with the mylonite zone. The Pliocene and (or) Pleistocene Bautista Formation unconformably overlies the mid-Cretaceous plutonic rocks.
Geologic and geochemical data indicate that the study area has high resource potential for marble, and moderate resource potential for epithermal gold deposits and tungsten skarns. The Desert Divide Group and the Palm Canyon Complex contain large resources of marble quarried for Portland cement and for construction applications. Gold occurs in quartz veins and pegmatites in the Desert Divide Group and the Penrod Quartz Monzonite. Skarns in the Desert Divide Group contain scheelite and anomalous concentrations of arsenic and beryllium. Thin layers of tremolite asbestos along low-angle thrust faults occur outside of the study area.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Mineral resources and resource potential map of the Pyramid Peak Roadless Area, Riverside County, California |
| Series title | Miscellaneous Field Studies Map |
| Series number | 1999 |
| DOI | 10.3133/mf1999 |
| Year Published | 1988 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | Plate: 28.18 x 25.27 inches |
| Country | United States |
| State | California |
| County | Riverside County |
| Other Geospatial | Pyramid Peak Roadless Area |
| Scale | 0 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |