Geology and geochemistry of the Broken Ridge area, southern Wah Wah Mountains, Iron County, Utah.
Duttweiler, Karen A; Griffitts, Wallace R (1989) Geology and geochemistry of the Broken Ridge area, southern Wah Wah Mountains, Iron County, Utah. U. S. Geological Survey Bulletin. 1989.
| Authors | Duttweiler, Karen A; Griffitts, Wallace R |
|---|---|
| Year | 1989 |
| Title | Geology and geochemistry of the Broken Ridge area, southern Wah Wah Mountains, Iron County, Utah. |
| Source | U. S. Geological Survey Bulletin. 1989. |
| Publisher | U. S. Geological Survey. Reston, VA, United States. Pages |
| Document type | Serial; Report; Map |
| ISSN | 8755-531X |
| GeoRef | 1989-066585 |
| Keywords | areal-geology; beryllium-ores; breccia-; Broken-Ridge; cassiterite-; Cenozoic-; chemical-composition; clastic-rocks; composition-; controls-; displacements-; economic-geology; faults-; fluorspar-; geochemical-methods; geochemistry-; geologic-maps; hydrothermal-alteration; hydrothermal-processes; igneous-rocks; Iron-County-Utah; lava-; maps-; metal-ores; metasomatism-; mineral-deposits,-genesis; mineral-exploration; Miocene-; molybdenum-ores; Neogene-; oxides-; reactivation-; rhyolites-; sedimentary-rocks; southwestern-Utah; Steamboat-Mountain-Formation; structural-controls; surveys-; Tertiary-; tin-ores; trace-elements; United-States; USGS-; Utah-; volcanic-rocks; Wah-Wah-Mountains |
Abstract
Rocks exposed in the Broken Ridge area consist of Miocene rhyolite lava flows, overlying Oligocene volcanic rocks and Paleozoic sedimentary rocks. The rhyolite flows are topaz-bearing and contain high amounts of silica, alkalies, tin, beryllium, fluorine, niobium, lithium, and rubidium. Widespread hydrothermal alteration is localized along numerous high-angle normal faults that cut the rhyolite. Cassiterite, fluorite, and hematite occur in a thoroughly silicified breccia body within the rhyolite flows immediately adjacent to a vent tuff at the north end of Broken Ridge. The breccia body contains anomalous concentrations of tin, antimony, arsenic, zinc, beryllium, and manganese.
25 samples from this reference
| Sample | Rock name | Major | Trace | Isotope |
|---|---|---|---|---|
| 83K199 | Rhyolite | yes | yes | |
| 83K105 | Rhyolite | yes | yes | |
| 83K233 | Rhyolite | yes | yes | |
| 83K236 | Rhyolite | yes | yes | |
| 83K133 | Rhyolite | yes | yes | |
| 83K275 | Rhyolite | yes | yes | |
| 83K281 | Rhyolite | yes | yes | |
| 83K132 | Rhyolite | yes | yes | |
| 83K031 | Rhyolite | yes | yes | |
| 83K135 | Pyroclastic-fall | yes | yes | |
| 1* | Vitrophere | yes | yes | |
| 83K265 | yes | yes | ||
| 2* | Mugearite | yes | ||
| 83K027 | Rhyolite | yes | yes | |
| 83K037 | Rhyolite | yes | yes | |
| 83K088 | Rhyolite | yes | yes | |
| 83K116 | Rhyolite | yes | yes | |
| 83K115 | Rhyolite | yes | yes | |
| 83K265 | Alteration | yes | yes | |
| 3* | Rhyolite | yes | yes | |
| 4* | Rhyolite | yes | yes | |
| 5* | Felsite | yes | yes | |
| 6* | yes | yes | ||
| 7* | Trachyandesite | yes | ||
| 8* | Trachyandesite | yes |