Thermochronometry At Coso Geothermal Area (2003)
Exploration Activity: Thermochronometry At Coso Geothermal Area (2003)
|Exploration Activity Details|
|Location||Coso Geothermal Area|
Determine the age of the geothermal system and the granitic host rock using the 40Ar/39Ar thermal history
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.
- Kurilovitch, L.; Norman, D.; Heizler, M.; Moore, J.; McCulloch, J. (1 January 2003) 40AR/39AR THERMAL HISTORY OF THE COSO GEOTHERMAL FIELD