Geochemical Model of the Granite-Bentonite-Groundwater at Äspö (LOT Experiment)

C. Domènech, D. Arcos, J. Bruno, O. Karnland, Arto Muurinen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    A geochemical modelling of one of the experimental parcels of the LOT experiment (Äspö, Sweden) is presented. The model consists on a 2D reactive transport model of a perpendicular section of the experimental borehole with a stationary temperature gradient ranging from 130 to 15°C. The results of the model show that temperature has an important effect on the geochemical evolution of the system. Due to the temperature effect, anhydrite replaces gypsum and hematite precipitates instead of Fe(OH)3(am). Calcite and siderite dissolve in the warmer part of bentonite; whereas a major replacement of Na by Ca in the bentonite takes place close to the bentonite-granite boundary. pH is buffered by the equilibrium with calcite, although the effect of temperature leads to a decrease in pH.
    Original languageEnglish
    Title of host publicationScientific Basis for Nuclear Waste Management XXVII
    PublisherMaterials Research Society
    Pages855-860
    ISBN (Print)978-1-55899-752-3, 1-55899-752-0
    DOIs
    Publication statusPublished - 2004
    MoE publication typeA4 Article in a conference publication
    Event27th MRS Symposium on the Scientific Basis for Nuclear Waste Management - Kalmar, Sweden
    Duration: 15 Jun 200319 Jun 2003

    Publication series

    SeriesMRS Online Proceedings
    Volume807
    ISSN1946-4274

    Conference

    Conference27th MRS Symposium on the Scientific Basis for Nuclear Waste Management
    CountrySweden
    CityKalmar
    Period15/06/0319/06/03

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  • Cite this

    Domènech, C., Arcos, D., Bruno, J., Karnland, O., & Muurinen, A. (2004). Geochemical Model of the Granite-Bentonite-Groundwater at Äspö (LOT Experiment). In Scientific Basis for Nuclear Waste Management XXVII (pp. 855-860). Materials Research Society. MRS Online Proceedings , Vol.. 807 https://doi.org/10.1557/PROC-807-855