Caractérisation du fond géochimique en éléments en traces dans les sols issus de roches sédimentaires du Nord de la France

Abstract : Surface and deeper horizons developed in 22 parent materials were sampledin the agricultural and forest soils of Northern France. Total contents of 18 trace elements and two major elements (AI, Fe) were determined in 758 horizon samples, together with the pedological characteristics. ln the deep horizons, the positive linear correlations of the less mobile trace elements (Bi, Co, Cr, Cu, ln, Ni, Pb, Sn, TI, V, Zn) contents with lutum(particles < 2 [micro]m), AI and Fe contents suggest that trace elements are closely associated to alumino-silicates and iron oxi-hydroxides of the finest solid phase. These correlations are close and are common to the deeper horizons of ail the parent materials, whatever their age and type. The processes of the sedimentary rock genesis, including ancient pedogenesis, did not cause any major segregation of the less mobile elements. The mobile elements (As, Cd, Hg, Mn, Mo, Sb Se) show less close relationship with the minerai phase, except Cd and As which seem particularly associated to Mn and Fe respectively. Mercury, Mn and Se show strong links with the organic matter in the deep horizons. Soit parent materials often show an enrichment with the mobile elements. Most of the calcareous rocks are enriched with Cd. Enrichments with ail trace elements, except with Co, Cr and Ni, were found in the surface horizons.
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_2004_STERCKEMAN_T.pdf
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Submitted on : Thursday, March 29, 2018 - 12:37:12 PM
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  • HAL Id : tel-01750073, version 1

Citation

Thibault Sterckeman. Caractérisation du fond géochimique en éléments en traces dans les sols issus de roches sédimentaires du Nord de la France. Sciences agricoles. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL022N⟩. ⟨tel-01750073⟩

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