Reference 639
Staatz, M H (1983) U. S. Geological Survey Professional Paper, Report: P 1049-D, D1-D52 pp., 1983
| Authors | Staatz, M H |
|---|---|
| Year | 1983 |
| Source | U. S. Geological Survey Professional Paper, Report: P 1049-D, D1-D52 pp., 1983 |
| ISSN | 1044-9612 |
| GeoRef | 1983-052544 |
| Keywords | Bear Lodge Mountains; Cenozoic; Crook County Wyoming; disseminated deposits; domes; economic geology; geochemical maps; geochemical methods; geochemistry; geologic maps; geophysical methods; geophysical surveys; grade; igneous rocks; intrusive rocks; maps; Mesozoic; metaigneous rocks; metal ores; metamorphic rocks; mineral exploration; Paleozoic; phonolites; programs; radioactivity methods; rare earth deposits; resources; stratigraphic units; surveys; Tertiary; thorium ores; trachytes; United States; USGS; veins; volcanic rocks; Wyoming |
| Notes | Notes Geology and resources of thorium in the United States |
Abstract
Thorium and rare-earth disseminated deposits occur in altered trachyte and phonolite intrusives that form the center of the Bear Lodge Dome. Several areas totaling 3.2 km super 2 contain at least 2,000 ppm total rare earths, and 1.7 km super 2 of this area contain at least 200 ppm thorium. In addition, 26 rare-earth and thorium veins are also found. These mineral deposits are related to doming of Paleozoic and Mesozoic sedimentary rocks by alkalic intrusives of Tertiary age.--from New Publications of the Geological Survey, April 1983.
33 samples from this reference
| Sample | Rock name | Major | Trace | Isotope |
|---|---|---|---|---|
| BL-1-76 | Carbonatite | yes | ||
| BL-2-76 | Carbonatite | yes | ||
| BL-3-76 | Carbonatite | yes | ||
| BL-7-76 | Carbonatite | yes | ||
| BL-14-76 | Carbonatite | yes | ||
| BL-16-76 | Carbonatite | yes | ||
| BL-17-16 | Carbonatite | yes | ||
| BL-18-76 | Carbonatite | yes | ||
| MHS-25-77 | Carbonatite | yes | ||
| MHS-1-77 | Carbonatite | yes | ||
| MHS-2-77 | Carbonatite | yes | ||
| MHS-3-77 | Carbonatite | yes | ||
| MHS-4-77 | Carbonatite | yes | ||
| MHS-7-77 | Carbonatite | yes | ||
| MHS-10-77 | Carbonatite | yes | ||
| MHS-13-77 | Carbonatite | yes | ||
| HS-20-77 | Carbonatite | yes | ||
| 1 | Lamprophyre | yes | ||
| 2 | Lamprophyre | yes | ||
| 3 | Latite | yes | ||
| 4 | Latite | yes | ||
| 5 | Latite | yes | ||
| 6 | Phonolite | yes | ||
| 7 | Phonolite | yes | ||
| 8 | Trachyte | yes | ||
| 9 | Phonolite | yes | ||
| 10 | Trachyte | yes | ||
| 11 | Phonolite | yes | ||
| 12 | Trachyte | yes | ||
| MHS-64-76 | Not-given | |||
| MHS-71-76 | Not-given | |||
| MHS-249-79 | Trachyte | |||
| MHS-256-79 | Phonolite |