SEARCH · Geology Reports
Results for “Trace Elements Memorandum”
Search indexed USGS publications on groundwater, aquifers, geologic maps, mineral resources and earthquakes. Explore source records by subject and place.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Photogeologic map of the east half of Cahone Quadrangle, Montezuma and Dolores counties, Colorado
No abstract available
Photogeologic map of the Delta Quadrangle, Montrose and Delta counties, Colorado
No abstract available
Photogeologic map of the Coach Creek NE quadrangle, Grand County, Utah, and Mesa County, Colorado
No abstract available
The Gas Hills uranium district and some probable controls for ore deposition
Uranium deposits occur in the upper coarse-grained facies of the Wind River formation of Eocene age in the Gas Hills district of the southern part of the Wind River Basin. Some of the principal deposits lie below the water table in the unoxidized zone and consist of uraninite and coffinite occurring as interstitial fillings in irregular blanket-like bodies. In the near-surface deposits that lie above the water table, the common yellow uranium minerals consist of uranium phosphates, silicates, and hydrous oxides. The black unoxidized uraninite -coffinite ores show enrichment of molybdenum, arsenic, and selenium when compared to the barren sandstone. Probable geologic controls for ore deposits include: 1) permeable sediments that allowed passage of ore-bearing solutions; 2) numerous faults that acted as impermeable barriers impounding the ore -bearing solutions; 3) locally abundant pyrite, carbonaceous material, and natuial gas containing hydrogen sulfide that might provide a favorable environment for precipitation of uranium. Field and laboratory evidence indicate that the uranium deposits in the Gas Hills district are very young and related to the post-Miocene to Pleistocene regional tilting to the south associated with the collapse of the Granite Mountains fault block. This may have stopped or reversed ground water movement from a northward (basinward) direction and alkaline ground water rich in carbonate could have carried the uranium into the favorable environment that induced precipitation.
Preliminary geologic map of Elk Ridge 2 SE quadrangle, San Juan County, Utah
No abstract available
Preliminary geologic map of the Orange Cliffs 3 NE Quadrangle, Wayne and Garfield Counties, Utah
No abstract available
Photogeologic map of the Coach Creek SE Quadrangle, Grand County, Utah, and Mesa County, Colorado
No abstract available
Photogeologic map of the Escalante Forks Quadrangle, Mesa, Montrose, and Delta Counties Colorado
No abstract available
Photogeologic map of the Norwood-1 Quadrangle, Montrose and Ouray Counties, Colorado
No abstract available
Preliminary geologic map of the Clay Hills 2 SW Quadrangle, San Juan County, Utah
No abstract available
Preliminary geologic map of the Clay Hills 2 NW Quadrangle, San Juan County, Utah
No abstract available
Preliminary geologic map of the Elk Ridge 4 SW Quadrangle, San Juan County, Utah
No abstract available
Preliminary geologic map of the Elk Ridge 1 NW Quadrangle, San Juan Quadrangle, Utah
No abstract available
Preliminary geologic map of the Circle Cliffs 1 NE quadrangle, Garfield County, Utah
No abstract available
Uraniferous coal and carbonaceous shale in northeast Parana, Brazil
Uraniferous coal has been found in northeast Parana, Brazil, in the Rio Bonito formation of Pennsylvanian age. In the majority of coal samples taken the uranium oxide content ranges from 0.005 to 0.030 percent, but selected screened samples have contained as much as 0.445 percent uranium oxide. The sampled thickness of the coal seam ranges from 17 to 54 centimeters and averages 31 centimeters. Channel samples across the entire thickness of the coal zone were taken in two places. All other samples were taken as grab samples from either mine waste dumps or coal zones that had high radioactivity. Sufficient information is not yet available to justify any detailed considerations of such features as geologic distribution, mode of occurrence, and radioactive equilibrium conditions of the uranium in the coal.
Reconnaissance for radioactive materials in the southern part of Brazil
During 1954-1956 a reconnaissance for radioactive minerals was made with carborne, airborne and handborne scintillation equipment in the southern Brazilian states of Rio de Janeiro, Sao Paulo, Parana, Santa Catarina and Rio Grande do Sul. During the traverse covering more than 5,000 kilometers the authors checked the radioactivity of Precambrian igneous and metamorphic rocks, Paleozoic, Mesozoic and Cenozoic sedimentary rocks, and Mesozoic alkalic intrusive and basaltic extrusive rocks. The 22 samples collected contained from 0.003 to 0.029 percent equivalent uranium oxide and from 0.10 to 0.91 percent equivalent thorimn; two samples were taken from radioactive pegmati tes for mineralogic studies. None of the localities is at present a commercial source of uranium or thorium; however, additional work should be done near the alkalic stock at Lages in the State of Santa Catarina and at the Passo das Tropas fossil plant locality near Santa Maria in the state of Rio Grande do Sul. Near Lages highly altered alkalic rock from a dike contained 0.026 percent uranium oxide. At Passo das Tropas highly altered, limonite-impregnated sandstone from the Rio do Rasto group of sedimentary rocks contained 0.029 percent uranium oxide.