Summary
In the Salton Sea Geothermal Field (SSGF), in the sediments of the delta of the Colorado River, we are developing a three-dimensional picture of active water/rock reactions at temperatures of < 300°C and salinities of 7 to 25 weight percent to produce quantitative data on mineral stabilities and mobilities of naturally-occurring radionuclides. The aim is to produce data to validate geochemical computer codes being developed to assess the performance of a Commercial High-Level Waste (CHLW) repository in salt. Among the findings to date are: (1) greenschist facies metamorphism is occurring; (2) brine compositions are fairly similar to those expected in candidate salt repository sites; (3) U and Th concentrations in the rocks are typical for sedimentary rocks; (4) the brines are enriched in Na, Mn, Zn, Sr, Ra, Po and strongly depleted in U and Th relative to the rocks; (5) significant radioactive disequilibria exist in brines and solid phrases of the SSGF. The disequilibria in the actinide series allow estimation of the rates of brine-rock interaction and understanding of hydrologic processes and radionuclide behaviour. Work is continuing emphasizing the reactions of authigenic clay minerals, epidotes, feldspars, chlorites and sulphates. So far, adapting geochemical codes to the necessary combination of high salinity and high temperature has lagged behind the natural analogue study of the SSGF so that validation is still in progress. In the future our data can be also used in validating performance assessment codes which couple geochemistry and transport processes, and in design of waste packages and back fill compositions.
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References
NATIONAL ACADEMY OF SCIENCES (1957). The disposal of radioactive waste on land. Report of the Committee on Waste Disposal, H. H. Hess, Chairman. National Academy of Sciences, Washington D. C., U.S.A., Publication No. 519, 142 pp.
OFFICE OF NUCLEAR WASTE ISOLATION (1984). Performance assessment, plans and methods for the salt repository project. Battelle Memorial Institute, Columbus, Ohio, U.S.A., Publication No. BMI/ONWI-513, 146 pp.
BROOKINS, D. G. (1984). Chemical aspects of radioactive waste disposal. Springer Verlag, New York, U.S.A., 347 pp.
ELDERS, W. A. and MOODY, J. B. (1985). The Salton Sea geothermal field as a natural analog for the near-field in a salt high-level nuclear waste repository. Materials Research Society Symposia Proceedings. Volume 44, Pittsburg, Pennsylvania, U.S.A., pp. 565–572.
CLAIBORNE, H. C., RICKERTSEN, L. D. AND GRAHAM, R. F. (1980). Expected environments in high-level nuclear waste and spent fuel repositories in salt. Oak Ridge National Laboratory, Oak Ridge, Tennessee, U.S.A., Publication No. ORNL/TM-7201.
ELDERS, W. A., REX, R. W., MEIDAV, T., ROBINSON, P. T. and BIEHLER, S. (1972). Crustal spreading in Southern California. The Imperial Valley and the Gulf of California formed by rifting apart of a continental plate: Science, Vol. 178, No. 4056, pp. 15–24.
ELDERS, W. A. (1979). The geological background of the geothermal fields of the Salton Trough in Geology and Geothermics of the Salton Trough, W. A. Elders (editor) University of California, Riverside, Campus Museum Contrib. Vol. 5, pp. 1–19.
LACHENBRUCH, A. H., SASS, J. H., and GALANIS, Jr., S. P. (1986). Heat flow in southernmost California and the origin of the Salton Trough. Jour. Geophys. Res., Vol. 90, No. B7, pp. 6709–6736.
ELDERS, W. A. and COHEN, L. H. (1983). The Salton Sea geothermal field, California as a near-field natural analog of a radioactive waste repository in salt. Battelle Memorial Institute, Columbus, Ohio, U.S.A. Publication No. BMI/ONWI-513, 146 pp.
SASS, J. and ELDERS, W. A. (1986). The Salton Sea Scientific Drilling Project. Geothermal Resources Council Transactions, Vol. 10, pp. 473–478.
MC DOWELL, S. D. and ELDERS, W. A. (1983). Allogenic layer silicate minerals in borehole Elmore 1, Salton Sea geothermal field, California. Amer. Min., Vol. 68, No. 11, pp. 1146–1159.
MUFFLER, L. J. P. and WHITE, D. E. (1969). Active metamorphism of upper Cenozoic sediments in the Salton Sea geothermal field and the Salton Trough, Southeastern California. Geol. Soc. Amer. Bull., Vol. 80, pp. 157–182.
MC KIBBEN, M. A., ELDERS, W. A. and WILLIAMS, A. E. (1986). Saline brines and ore-forming processes in the geothermal systems of the Salton Trough in Guptil, P. D., Gath, E. M. and Ruff, R. W. (eds.) Geology of the Imperial Valley, California. South Coast Geological Society, Guidebook No. 14, pp. 144–151.
MC KIBBEN, M. A. and ELDERS, W. A. (1985). Fe-Zn-Cu-Pb mineralization in the Salton Sea geothermal system, Imperial Valley, California. Econ. Geol., Vol. 80, pp. 539–559.
CLARK, D. E. and BRADLEY, D. J. (1984). Definition of the Waste Package Environment for a repository located in salt. Proceedings of the 1983 Civilian Radioactive Waste Management Information Meeting. U.S. Dept. of Energy, Washington, D. C. Conf. — 831217, pp. 284–289.
MAIMORI, A. (1982). Mineral recovery from Salton Sea geothermal brines. Geothermics, Vol. 11, pp. 239–258.
MC DOWELL, S. D. and ELDERS, W. A. (1980). Authigenic layer silicate minerals in borehole Elmore 1, Salton Sea geothermal field, California, U.S.A. Contributions to Mineralogy and Petrology, Vol. 74, pp. 293–310.
WOLERY, T. J. (1979). Calculation of chemical equilibrium between aqueous solution and minerals: the EQ3/6 software package. Lawrence Livermore National Laboratory, report UCRL-52658, 39 pp.
WOLERY, T. J. (1983). EQ3NR A computer program for geochemical aqueous speciation — solubility calculations: User’s Guide and documentation. Lawrence Livermore National Laboratory, report UCRL-53414, pp. 1–191.
BOWERS, T. S., JACKSON, K. J. and HELGESON, H. C. (1984). Equilibrium activity diagrams for coexisting minerals and aqueous solutions at pressures and temperatures to 5kb and 600°C. Springer-Verlag, Berlin, 397 pp.
ZUKIN, J. G. (1986). Uranium and Thorium series isotopes in the Salton Sea geothermal field, southeastern California: Their applications in determining the rates of brine-rock interaction and radionuclide transport. Unpublished M. S. Thesis, University of Southern California, 156 pp.
ZUKIN, J. G., HAMMOND, D. E. and KU, T. L. (1986). Uranium-Thorium series isotopes in brines and reservoir rocks from two deep geothermal well holes in the Salton Sea geothermal field, southeastern California. Geochemica et Cosmochimica Acta (In press).
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Elders, W.A. (1987). A Natural Analogue for Near-Field Behaviour in a High Level Radioactive Waste Repository in Salt: The Salton Sea Geothermal Field, California, USA. In: Côme, B., Chapman, N.A. (eds) Natural Analogues in Radioactive Waste Disposal. Radioactive Waste Management Series. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3465-8_30
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DOI: https://doi.org/10.1007/978-94-009-3465-8_30
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