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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A178 (1981)

First Page: 73

Last Page: 79

Book Title: SG 13: Uranium in Volcanic and Volcaniclastic Rocks

Article/Chapter: Geology and Uranium Deposits Along the Northeastern Margin, McDermitt Caldera Complex, Oregon

Subject Group: Energy Minerals, Etc.

Spec. Pub. Type: Studies in Geology

Pub. Year: 1981

Author(s): Andy B. Wallace, Michael W. Roper

Abstract:

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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