Geochronology of hydrothermal uranium deposits and associated igneous rocks in the eastern source area of the Mount Belknap Volcanics, Marysvale, Utah

Journal Article · · Econ. Geol.; (United States)

DOI:https://doi.org/10.2113/gsecongeo.77.2.453· OSTI ID:7016169

Cunningham, C G; Ludwig, K R; Naeser, C W; Weiland, E K; Mehnert, H H; Steven, T A; Rasmussen, J D

Radiometric ages of igneous rocks and hydrothermal uranium-fluorine veins in the eastern source area of the Mount Belknap Volcanics near Marysvale, Utah, show that igneous activity occurred over a time interval of about 9 million years and that hydrothermal uranium deposits were formed about midway through the interval. Intrusive igneous activity in the central mining area began about 23 m.y. ago with emplacement of the quartz monzonitic central intrusive of the Buillion Canyon Volcanics and was followed by a hypabyssal granitic stock, eruption of the Red Hills Tuff Member, and emplacement of dikes, finally ending about 18 m.y. ago. Hydrothermal uranium mineralization occurred with the last event in this sequence and is genetically associated with emplacement of glassy rhyolite dikes between 18 and 19 m.y. ago. Refs.

• Research Organization: US Geol Surv, Denver, CO, USA
• OSTI ID: 7016169
• Journal Information: Econ. Geol.; (United States), Journal Name: Econ. Geol.; (United States) Vol. 77:2; ISSN ECGLA
• Country of Publication: United States
• Language: English

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