Significance and estimations of lifetime of natural fracture mineral buffers in the Olkiluoto bedrock

Ari Luukkonen, Petteri Pitkänen, Sami Partamies

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

    Abstract

    The study makes scenarios what geochemical effects the future underground excavations in the Olkiluoto bedrock have on naturally occurring fracture minerals. The excavations of underground research facilities and final repository galleries will cause steep hydraulic gradients in the bedrock fractures. These gradients likely draw surficial waters within the fracture network and activate weathering processes deeper in rock fractures than in the natural undisturbed conditions. The studies are concentrated on the meteoric and seawater infiltration in the rock fractures, and on the selected minerals considered significant buffers against pH/redox variations in groundwater. Of the Olkiluoto fracture minerals, calcite and pyrite turn out to be the most important buffer minerals against dissolved O2 and low pH in groundwater.
    Original languageEnglish
    Title of host publicationThe 26th Nordic Geological Winter Meeting: Abstract Volume
    Publication statusPublished - 2004
    MoE publication typeNot Eligible
    Event26th Nordic Geological Winter Meeting - Uppsala, Sweden
    Duration: 6 Jan 20049 Jan 2004

    Publication series

    SeriesGFF
    Number1
    Volume126
    ISSN0016-786X

    Conference

    Conference26th Nordic Geological Winter Meeting
    CountrySweden
    CityUppsala
    Period6/01/049/01/04

    Keywords

    • water geochemistry
    • water-rock interaction
    • fracture zone
    • fracture mineral
    • buffering capacity

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    Luukkonen, A., Pitkänen, P., & Partamies, S. (2004). Significance and estimations of lifetime of natural fracture mineral buffers in the Olkiluoto bedrock. In The 26th Nordic Geological Winter Meeting: Abstract Volume [174] GFF, No. 1, Vol.. 126