Thermochronometry At Coso Geothermal Area (2003)

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Exploration Activity: Thermochronometry At Coso Geothermal Area (2003)

Exploration Activity Details
Location Coso Geothermal Area
Exploration Technique Thermochronometry
Activity Date 2003

Usefulness not indicated
DOE-funding Unknown

 
Exploration Basis
Determine the age of the geothermal system and the granitic host rock using the 40Ar/39Ar thermal history
 
Notes
A downhole 40Ar/39Ar thermochronology study of granitic host-rock K-feldspar is presently being undertaken at the New Mexico Geochronology Research Laboratory. The technique couples the measurement of argon loss from K-feldspar and knowledge of the diffusion parameters of transport in K-feldspar to estimate the longevity of the system at present day temperature and also to obtain an estimate of the host rock age. The study centers around a vertical distribution of samples obtained from Coso well 73-19 that reaches temperatures of 3250C at a depth of 1550m and thus represents one of the hottest producing wells in the Coso system. Four samples from Coso well 73-19, from depths 550m (downhole temperature 1500C), 700m (2000C), 1085m (2750C), and 1850m (3250C), were isolated from the granitic host rock chip samples.

 
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