Isotopic Analysis- Rock At Coso Geothermal Area (1997)
Exploration Activity: Isotopic Analysis- Rock At Coso Geothermal Area (1997)
|Exploration Activity Details|
|Location||Coso Geothermal Area|
|Exploration Technique||Isotopic Analysis- Rock|
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.
- Glazner, A.F.; Miller, J.S. (1 January 1997) A major lithospheric boundary in eastern California defined by isotope ratios in Cenozoic basalts from the Coso Range and surrounding areas