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- W2023496189 abstract "Recent geological and mineralogical data provide a better understanding of the Th- and REE-rich orebody at Morro do Ferro as a possible natural analogue for a radioactive waste repository. The ore is contained in NW-SE-elongated clay lenses and has resulted from in situ concentration after the original host rock (54 Myr.) was hydrothermally altered and weathered. The thorium minerals consist of ZrCeLaNd-rich resistates. The dominant form in which Th is present is amorphous complexes adsorbed on the surface of clay minerals and on the Al- and Fe-hydroxides which, in this case, have proved an effective retardation factor for Th immobilization within and away from the enriched zones. The large range of Th concentrations within short distances, the intense fracturing and alteration, and the abundance of magnetite dykes, underline the many geological processes involved in a rather short geological time. Therefore it is a particularly interesting site for studies of radionuclide migration in the natural environment." @default.
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- W2023496189 date "1986-06-01" @default.
- W2023496189 modified "2023-09-25" @default.
- W2023496189 title "Natural analogue studies: Geology and mineralogy of Morro do Ferro, Brazil" @default.
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- W2023496189 doi "https://doi.org/10.1016/0009-2541(86)90031-8" @default.
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