Uranium minerals in Oligocene gypsum near Chadron, Dawes County, Nebraska
Trace Elements Investigations
525
By: R.J. Dunham
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- Document: Report (pdf)
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Abstract
Carnotite, sabugalite [HAI(UO2)4(PO4)4 • 16H2O] and autunite occur in the basal 25 feet of a 270-foot sequence of nonmarine bedded gypsum and gypsiferous clay in the Brule formation of Oligocene age about 12 miles northeast of Chadron in northeastern Dawes County, Nebraska. Uranium minerals are visible at only two localities and are associated with carbonaceous matter. Elsewhere the basal 25 feet of the gypsum sequence is interbedded with carbonate rocks and is weakly but persistently uraniferous. Uranium probably was emplaced from above by uranyl solutions rich in sulfate.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Uranium minerals in Oligocene gypsum near Chadron, Dawes County, Nebraska |
| Series title | Trace Elements Investigations |
| Series number | 525 |
| DOI | 10.3133/tei525 |
| Year Published | 1955 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 31 p. |
| Country | United States |
| State | Nebraska |
| County | Dawes County |
| Scale | 100000 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |