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Field-Based Tests of Geochemical Modeling Codes: New Zealand Hydrothermal Systems

Published online by Cambridge University Press:  25 February 2011

Carol J. Bruton ,
William E. Glassley  and
William L. Bourcier
Carol J. Bruton
Affiliation:
Lawrence Livermore National Laboratory, L-219, P.O. Box 808, Livermore, CA 94550
William E. Glassley
Affiliation:
Lawrence Livermore National Laboratory, L-219, P.O. Box 808, Livermore, CA 94550
William L. Bourcier
Affiliation:
Lawrence Livermore National Laboratory, L-219, P.O. Box 808, Livermore, CA 94550
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Abstract

Hydrothermal systems in the Taupo Volcanic Zone, North Island, New Zealand are being used as field-based modeling exercises for the EQ3/6 geochemical modeling code package. Comparisons of the observed state and evolution of the hydrothermal systems with predictions of fluid-solid equilibria made using geochemical modeling codes will determine how the codes can be used to predict the chemical and mineralogical response of the environment to nuclear waste emplacement. Field-based exercises allow us to test the models on time scales unattainable in the laboratory.

Preliminary predictions of mineral assemblages in equilibrium with fluids sampled from wells in the Wairakei and Kawerau geothermal field suggest that affinity-temperature diagrams must be used in conjunction with EQ6 to minimize the effect of uncertainties in thermodynamic and kinetic data on code predictions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 333: Symposium V – Scientific Basis for Nuclear Waste Management XVII , 1993 , 617
Copyright
Copyright © Materials Research Society 1994

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References

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