Duration of hydrothermal activity at Steamboat Springs, Nevada, from ages of spatially associated volcanic rocks

Technical Report · Mon Jan 01 04:00:00 EST 1979

DOI:https://doi.org/10.2172/6741584· OSTI ID:6741584

Silberman, M L; White, D E; Keith, T E.C.; Dockter, R D

Steamboat Springs is a presently active equivalent of epithermal gold-silver ore-forming systems. Hot-spring sinter deposits contain small amounts of gold, silver, mercury, antimony, and arsenic. Hot-spring activity probably started before extrusion of the basaltic andesite of Steamboat Springs. Old sinter from the Steamboat Springs system occurs in gravels above and below the basaltic andesite. Intense hydrothermal alteration, including almost complete replacement by hydrothermal potassium-feldspar, has affected the basaltic andesite. Three plagioclase separates of differing potassium content from fresh basaltic andesite yielded potassium-argon ages of 2.52 to 2.55 m.y. Basaltic andesite almost completely replaced by potassium-feldspar yielded an age of 1.1 m.y. The source of energy for the thermal convection system is probably a large rhyolitic magma chamber that supplied the pumice and from which the rhyolite domes were emplaced. Sanidine and obsidian from four of the rhyolite domes yielded potassium-argon ages of 1.15 to 1.52 m.y. and obsidian from one of the northeastern domes yielded apparent ages of 2.97 and 3.03 m.y. The data indicate that hydrothermal activity has occurred at Steamboat Springs, possibly intermittently, for more than 2-1/2 m.y. These data agree with other radiogenic age studies indicating 1- and 2-m.y. lifetimes for the hydrothermal systems that generate epithermal gold-silver deposits.

• Research Organization: Geological Survey, Washington, DC (USA)
• OSTI ID: 6741584
• Report Number(s): USGS-PP-458-D; ON: DE83900373
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150201* -- Geology & Hydrology of Geothermal Systems-- USA-- (-1989)
AGE ESTIMATION
ANORTHOSITES
ENERGY SYSTEMS
FEDERAL REGION IX
FELDSPARS
GABBROS
GEOTHERMAL SYSTEMS
Geothermal Legacy
HYDROTHERMAL ALTERATION
HYDROTHERMAL STAGE
HYDROTHERMAL SYSTEMS
IGNEOUS ROCKS
MAGMA
MINERALS
NEVADA
NORTH AMERICA
PLUTONIC ROCKS
PUMICE
RHYOLITES
ROCKS
STEAMBOAT SPRINGS
USA
VOLCANIC ROCKS