Comparative behaviour of recently deposited radiostrontium and atmospheric common strontium in soils (Vosges mountains,France) |
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| Authors: | L Pourcelot P Stille D Aubert N Solovitch-Vella F Gauthier-Lafaye |
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| Institution: | 1. IRSN, Bat 153 Cadarache, 13108 St Paul-lez-Durance, France;2. Centre de Géochimie de la Surface – CNRS 1, Rue Blessig 67083 Strasbourg, France;3. CEFREM, Université de Perpignan 52, Avenue Paul Alduy 66860 Perpignan, France |
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| Abstract: | The vertical distribution of atmospheric 87Sr/86Sr isotope ratios in soil is compared to the distribution of recent atmospheric 90Sr deposition. 87Sr/86Sr isotope ratios of soil leachates are correlated with 90Sr activities. Samples from the uppermost part of a soil profile have low 87Sr/86Sr ratios and high 90Sr activities. Samples from the deeper part of the soil profile, however, have high 87Sr/86Sr but low 90Sr activities. This points to mixing between an atmospheric and a geogenic component. Mixing calculations indicate that 50–80% of the Sr in the topsoil of a small catchment in the Vosges mountains is of atmospheric origin. Similarly 87Sr/86Sr of roots point to the presence of an atmospheric and geogenic component. 87Sr/86Sr ratios of soil leachates and corresponding roots are very similar indicating, that the roots integrate at each level of the soil profile the leachable Sr of the corresponding soil. |
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