Uranium and diagenesis in evaporitic lacustrine mudstone of the Oligocene White River Group, Dawes County, Nebraska

In this paper the uranium mineralization and diagenesis of an evaporitic lacustrine mudstone and related fluvial and colluvial facies in the White River Group in Dawes county, Nebraska, are described. Diagenetic minerals and textures are identified using a variety of petrologic methods, including x-ray diffraction, thin-section study, and scanning electron micrography. R-mode factor analysis was performed on a data base containing chemical and mineralogical data. Uranium distribution in the depositional and diagenetic environments is also analyzed