Isotopic Analysis At U.S. West Region (Welhan, Et Al., 1988)

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Exploration Activity: Isotopic Analysis At U.S. West Region (Welhan, Et Al., 1988)

Exploration Activity Details
Location U.S. West Region
Exploration Technique Isotopic Analysis- Fluid
Activity Date

Usefulness useful
DOE-funding Unknown

 
Notes
Helium isotope ratios are not correlated with regional heat flow in the western United States. High helium isotope ratios (R/RA > 2) occur only in magma-based geothermal systems. A direct correlation exists between geothermal reservoir temperature and helium isotope ratio of the fluids, suggesting that both heat and helium in a geothermal reservoir are derived from a shallow magmatic source. The rapid lateral decrease in 3He away from such systems indicates that high helium isotope ratios are a local manifestation of magma emplacement and hydrothermal convection.


Additional References