Isotopic Analysis- Rock At Coso Geothermal Area (1997)

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Exploration Activity: Isotopic Analysis- Rock At Coso Geothermal Area (1997)

Exploration Activity Details
Location Coso Geothermal Area
Exploration Technique Isotopic Analysis- Rock
Activity Date 1997

Usefulness useful
DOE-funding Unknown

Exploration Basis
Determine a major lithospheric boundary
Sr and Nd isotope ratios of Miocene-Recent basalts in eastern California, when screened for crustal contamination, vary dramatically and indicate the presence of a major lithospheric boundary that is not obvious from surface geology. Isotope ratios from the Coso field form a bull's-eye pattern with very low 87Sr/86Sr (0.7033) centered just south of the geothermal area. The boundary between enriched (high 87Sr/86Sr) and depleted (low 87Sr/86Sr) domains is sharply defined in the Coso Range and coincides with the northeastern boundary of recent seismic activity.

Additional References