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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
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Concentrations of uranium in Cenozoic deposits of Arizona occur with carbonaceous and siliceous matter in light-colored, calcareous mudstones or fetid carbonates that were deposited in lacustrine, paludal or low-energy floodplain environments. Although uranium was deposited throughout the Cenozoic, the largest uranium resources in the state occur in the Date Creek basin in fine-grained sediments associated with ignimbrite volcanism of the mid-Tertiary orogeny. This concentration may be related to the coincidence of three factors: low-energy environments where fine grained, carbonaceous, lacustrine or paludal sediments were accumulating; exposure of large areas of alkalic Precambrian granite; and, extrusion of large volumes of relatively alkalic and silicic volcanics of th mid-Tertiary ignimbrites.
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