Isotopic fractionation of U in rocks reflecting redox conditions around a groundwater flow route

Juhani Suksi, Kari Rasilainen

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

    Abstract

    Low 234U/238U activity ratios observed in rock and mineral samples were scrutinized. U isotope fractionation leading to 234U depletion (234U/238U<1) in rocks appears to be linked to changes in redox conditions. The fractionation takes place as selective chemical release dominates over direct physical μ recoil. This preferential 234U release depends on the valence contrast between the U isotopes, 238U occurring in +4 form and ingrown 234U, due to oxidizing microenvironment, in +6 form. Observed U isotopic fractionation combined with other uranium series disequilibrium measurements provides a tool for locating redox fronts formed as a result low temperature rock-groundwater interaction.
    Original languageEnglish
    Title of host publicationScientific Basis for Nuclear Waste Management XXIV
    EditorsK.P. Hart, G.R. Lumpkin
    PublisherMaterials Research Society
    Pages961-969
    DOIs
    Publication statusPublished - 2002
    MoE publication typeA4 Article in a conference publication
    Event24th International Symposium on the Scientific Basis for Nuclear Waste Management - Sydney, Australia
    Duration: 28 Aug 200031 Aug 2000

    Publication series

    SeriesMaterials Research Society Symposia Proceedings
    Volume663
    ISSN0272-9172

    Conference

    Conference24th International Symposium on the Scientific Basis for Nuclear Waste Management
    CountryAustralia
    CitySydney
    Period28/08/0031/08/00

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  • Cite this

    Suksi, J., & Rasilainen, K. (2002). Isotopic fractionation of U in rocks reflecting redox conditions around a groundwater flow route. In K. P. Hart, & G. R. Lumpkin (Eds.), Scientific Basis for Nuclear Waste Management XXIV (pp. 961-969). Materials Research Society. Materials Research Society Symposia Proceedings, Vol.. 663 https://doi.org/10.1557/PROC-663-961