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- W2004458802 abstract "Soil isotopic dating is important for understanding mass transfers related to rock weathering. Here we evaluate a method including TIMS analyses of (234U/238U) activity ratios on < 0.2 μm fractions of a Cameroon latérite. Variations of the (234U/238U) ratios with depth show (1) significant (234U/238U) disequilibrium at the bottom of the pedological units, and (2) progressive returns towards secular equilibrium above. These results suggest that U fractionation occurs at the base of the units and that the analysed fractions probably evolve as closed/restricted systems within each unit. From these data, an overall age of 1.5 Ma may be proposed for the development of this laterite. La datation isotopique des sols est importante pour comprendre les transferts de matière liés à l'altération. Nous présentons ici une méthode incluant l'analyse par TIMS des déséquilibres (234U/238U) de fractions inférieures à 0,2 μm d'une latérite du Cameroun. Les variations avec la profondeur du rapport d'activité (234U/238U) font apparaître des déséquilibres importants à la base des unités pédologiques et un retour progressif vers l'équilibre au-dessus. Ces résultats suggèrent que les fractionnements de l'uranium ont lieu à la base des unités et que les fractions analysées évoluent probablement en système clos au sein de chaque unité. L'utilisation chronométrique de ces résultats donnerait un âge global de 1,5 Ma pour le développement de cette latérite." @default.
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- W2004458802 date "1999-05-01" @default.
- W2004458802 modified "2023-09-25" @default.
- W2004458802 title "Dating of weathering profiles by radioactive disequilibria: Contribution of the study of authigenic mineral fractions" @default.
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- W2004458802 doi "https://doi.org/10.1016/s1251-8050(99)80177-3" @default.
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