Isotopic Analysis- Rock At Coso Geothermal Area (1984)

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Exploration Activity: Isotopic Analysis- Rock At Coso Geothermal Area (1984)

Exploration Activity Details
Location Coso Geothermal Area
Exploration Technique Isotopic Analysis- Rock
Activity Date 1984

Usefulness not indicated
DOE-funding Unknown

Exploration Basis
To analyze evidence for crustal interaction and compositional zonation in the source regions of Pleistocene basaltic and rhyolitic magmas of the Coso volcanic field
The isotopic compositions of Pb and Sr in Pleistocene basalt, high-silica rhyolite, and andesitic inclusions in rhyolite of the Coso volcanic field indicate that these rocks were derived from different levels of compositionally zoned magmatic systems. The two earliest rhyolites probably were tapped from short-lived silicic reservoirs, in contrast to the other 36 rhyolite domes and lava flows which the isotopic data suggest may have been leaked from the top of a single, long-lived magmatic system. Most Coso basalts show isotopic, geochemical, and mineralogic evidence of interaction with crustal rocks, but one analyzed flow has isotopic ratios that may represent mantle values.

Additional References