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Tertiary Volcanic Rocks In Southwest Montana And Adjacent Idaho As Possible Source Rocks For Epigenetic Stratabound Uranium Deposits, Richard Brian Wice

WWU Graduate School Collection

Rhyolitic volcanic and volcaniclastic rocks found in or on the margins of Tertiary basins that contain sandstone-type uranium deposits are considered by many workers to be the source rocks for the uranium. In southwestern Montana and adjacent Idaho three volcanic areas were mapped and evaluated by geochemical analysis. X-ray diffraction and petrographic studies to determine if the volcanics are good source rocks for uranium deposits in nearby Tertiary basins. Area I volcanics, south of Dillon, Montana, have radiometric ages, uranium, thorium and fluorine contents and petrography similar to the Post-Lowland Creek Volcanics in the Boulder Batholith region and are tentatively …