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Uranium minerals in Oligocene gypsum near Chadron, Dawes County, Nebraska

R.J. Dunham
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Abstract

Carnotite, sabugalite [HAI(UO 2 ) 4 (PO 4 ) 4 • 16H 2 O] 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.

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90° N90° S · 180° W ← longitude → 180° E
Source-reported bounding extent: 42.43758° to 43.000879° latitude; -103.506305° to -102.772377° longitude. This indicates report coverage, not an exact sampling location. View area on OpenStreetMap.

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BibTeXRIS

R.J. Dunham. 1955. Uranium minerals in Oligocene gypsum near Chadron, Dawes County, Nebraska. https://doi.org/10.3133/tei525

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