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Release of uranium from rock matrix—a record of glacial meltwater intrusions? |
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| Authors: | Kari Rasilainen Juhani Suksi Timo Ruskeeniemi Petteri Pitknen Antti Poteri |
| Institution: | a VTT Processes, P.O. Box 1608, FIN-02044 VTT, Espoo, Finland;b University of Helsinki, P.O. Box 55, FIN-00014 Helsinki University, Finland;c Geological Survey of Finland, P.O. Box 96 FIN-02151, Espoo, Finland;d VTT Building and Transport, P.O. Box 1800, FIN-02044 VTT, Espoo, Finland |
| Abstract: | Uranium release observed in a rock matrix around water-carrying fractures was studied using U-series disequilibrium (USD) modelling and mass balance calculations. Several release scenarios were tested, with specific attention to the glacial aspects. The release appears to have occurred in two or three violent episodes during the last 300 ky. A release after the last glaciation can be excluded on mass flow grounds. Continuous release for more than 300 ky can be excluded on radioactive disequilibrium grounds. Repeated inflows of oxic glacial meltwater seem to have triggered the release episodes. |
| Keywords: | Uranium U migration U-series disequilibrium Glaciation |
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