36Cl/Cl ratios in geothermal systems- preliminary measurements from the Coso Field

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Conference Proceedings: 36Cl/Cl ratios in geothermal systems- preliminary measurements from the Coso Field

Abstract
The {sub 36}Cl/Cl isotopic composition of chlorine in geothermal systems can be a useful diagnostic tool in characterizing hydrologic structure, in determining the origins and age of waters within the systems, and in differentiating the sources of chlorine (and other solutes) in the thermal waters. The {sub 36}Cl/Cl values for several geothermal water samples and reservoir host rock samples from the Coso, California geothermal field have been measured for these purposes. The results indicate that most of the chlorine is not derived from the dominant granitoid that host the geothermal system. If the chlorine was originally input into the Coso subsurface through meteoric recharge, that input occurred at least 1-1.25 million years ago. The results suggest that the thermal waters could be connate waters derived from sedimentary formations, presumably underlying and adjacent top the granitic rocks, which have recently migrated into the host rocks. Alternatively, most of the chlorine but not the water, may have recently input into the system from magmatic sources. In either case, the results indicate that most of the chlorine in the thermal waters has existed within the granitoid host rocks for no more than about 100,00-200,00 years. this residence time for the chlorine is similar to residence times suggested by other researchers for chlorine in deep groundwaters of the Mono Basin north of the Coso field.

Authors 
Nimz, G. J.; Moore, J. N.; Kasameyer and P. W. 








Published 
Geothermal Resource Council Transactions 1997, 7/1/1997





DOI 
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Citation

Nimz, G. J.; Moore, J. N.; Kasameyer, P. W. . 7/1/1997. 36Cl/Cl ratios in geothermal systems- preliminary measurements from the Coso Field. Proceedings of (!) ; (!) : Geothermal Resource Council Transactions 1997.


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  1. Coso Geothermal Area
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