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Isotopic Analysis- Gas At Long Valley Caldera Geothermal Area (Welhan, Et Al., 1988)
ExpActivityDate 1988  +
ExpActivityDateEnd 1990  +
ExplorationOutcome useful  +
ExplorationTechnique Isotopic Analysis- Fluid +
Notes Hot spring waters and steam analyzed for t
Hot spring waters and steam analyzed for their 3He/4He isotopic contents yielded values that ranged from 4.5 x Ra in the west moat and at Casa Diablo to 6.0-6.5 x Ra in Hot Creek gorge and at Little Hot Creek (Welhan et al., 1988). Significant changes in 3He/4He content were also measured in a fumarole on the north side of Mammoth Mountain from 1989-1990, during which time helium isotope values increased from 3.6 x Ra to 5.5 x Ra from July to October 1989, and then stabilized at 6 x Ra from January to November 1990 (Sorey et al., 1990). This shift exceeds the measured seasonal variation in 3He/4He content, and is suggestive of the addition of magmatic helium to the hydrothermal system. The increase in x Ra coincides with an intense period of seismic activity beneath Mammoth Mountain from May to October 1989 that was accompanied by a magmatic intrusion, as indicated by earthquake hypocenters and deformation data (Hill et al., 1990). These data suggest that recent magmatic activity may contribute to the thermal high beneath the caldera's western margin. Gas isotope data from these and previous studies have been tabulated by Winnett and Janik (1986) and Sorey et al. (1993), and are discussed in comparison with gas isotope data from the [Yellowstone Caldera Geothermal Region
the [Yellowstone Caldera Geothermal Region  +
OpenEI/PageDescription Isotopic Analysis- Gas At Long Valley Caldera Geothermal Area (Welhan, Et Al., 1988): geothermal exploration activity.  +
OpenEI/PageKeyword Geothermal  + , Long Valley Caldera Geothermal Area  + , Isotopic Analysis- Fluid  +
Place Long Valley Caldera Geothermal Area +
Reference material Helium Isotopes in Geothermal and Volcanic Gases of the Western United States, II. Long Valley Caldera + , Increases in 3He/4He in Fumarolic Gas Associated with the 1989 Earthquake Swarm Beneath Mammoth Mountain, California + , The 1989 Earthquake Swarm Beneath Mammoth Mountain, California: An Initial Look at the 4 May Through 30 September Activity + , Isotopic Composition of Carbon in Fluids from the Long Valley Geothermal System, California, In- Proceedings of the Second Workshop on Hydrologic and Geochemical Monitoring in the Long Valley Caldera + , Gas Geochemistry Of The Valles Caldera Region, New Mexico And Comparisons With Gases At Yellowstone, Long Valley And Other Geothermal Systems +
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Isotopic Analysis- Gas At Long Valley Caldera Geothermal Area (Welhan, Et Al., 1988) + , Isotopic Analysis- Gas At Long Valley Caldera Geothermal Area (Welhan, Et Al., 1988) +
Categories Geothermal , Exploration Activities
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20:00:12, 19 May 2014  +
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