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- W1650325573 abstract "We determined the Si isotope compositions in the clay fraction of a podzolic soil chronosequence and document light Si enrichment during pedogenesis that increases with soil age. Relative to the original “unweathered” claysize minerals in deepsoil (δSi = -0.52±0.16 permil), the clay fraction of the topsoil eluvial horizon show less negative δSi values (δSifrom -0.33 to -0.10 permil), while the clay fraction of the subsoil illuvial horizons is isotopically lighter (δSi from -0.60 to -0.84 permil). Geochemical and X-ray diffraction analyses show that the on-going enrichment in light Si in pedogenic minerals of illuvial subsoil horizons can only be related to the dissolution in the topsoil horizon of clay minerals previously enriched in Si. The Si enrichment in the clay fraction with pedogenesis and soil age provides consistent evidence for the cyclical dissolution and re-precipitation of pedogenic minerals. Our study shows that the successive generations of clay minerals occur over very short time scales (ca. 300 years). This is instrumental in the evolution of the clay mineral genesis in soils." @default.
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- W1650325573 date "2014-05-01" @default.
- W1650325573 modified "2023-10-18" @default.
- W1650325573 title "Si isotopes record cyclical dissolution and re-precipitation of pedogenic clay minerals in a podzolic soil chronosequence" @default.
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