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Economic Geology; May 2003; v. 98; no. 3; p. 657-660; DOI: 10.2113/98.3.657
© 2003 Society of Economic Geologists
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Scientific Communications

{delta}D values of fluid inclusion water in quartz and calcite ejecta from active geothermal systems: do values reflect those of original hydrothermal water?

Kevin Faure{dagger}

Institute of Geological & Nuclear Sciences, PO Box 31-312, Lower Hutt, New Zealand

{dagger} E-mail: k.faure{at}gns.cri.nz

One of the most common methods for estimating paleohydrothermal {delta}D values in epithermal quartz veins is hydrogen isotope analysis of H2O extracted from fluid inclusions in quartz by thermal decrepitation. The validity of the method is questioned. The {delta}D values of water extracted from fluid inclusions in clear euhedral quartz from active geothermal systems are up to 30 per mil more negative than the {delta}D value (–42{per thousand}) of the geothermal water. Measured {delta}D values of the fluid inclusion water are dependent on the temperature at which the water in the quartz was extracted. Water extracted at 800°C has {delta}D values about 10 to15 per mil lower than fluid inclusion water extracted at 500°C (–53 to –61{per thousand}). Fluid inclusion water in calcite from an active geothermal well has {delta}D values that match those of the geothermal water. Calcite is thus potentially a more suitable mineral for estimating paleohydrothermal {delta}D values.




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A. C. Harris, S. D. Golding, and N. C. White
Bajo de la Alumbrera Copper-Gold Deposit: Stable Isotope Evidence for a Porphyry-Related Hydrothermal System Dominated by Magmatic Aqueous Fluids
Economic Geology, August 1, 2005; 100(5): 863 - 886.
[Abstract] [Full Text] [PDF]


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