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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
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The adjoining Aurora and Bretz uranium prospects are located along the northeastern ring-fracture system of the Miocene McDermitt caldera. A series of block faults, constituting the ring-fracture system, divide the area into two contrasting terranes. The northern terrane includes a series of mafic to silicic lavas and rhyolite ash-flow tuff (Bretz series). Rocks of the southern terrane (Aurora series) represent filling in of the caldera after collapse. Uranium concentrations occur along several horizons, including: geologic contacts, unconformities, and redox boundaries in the Bretz series; a widespread horizon within the tuffaceous lake sediments; and potentially commercial deposits along flow boundaries and interflow breccia in the Aurora lavas.
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