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Université de Provence - Aix-Marseille I Hyper Articles en Ligne |
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Université de Provence - Aix-Marseille I Hyper Articles en Ligne |
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| HAL : hal-00323571, version 1 |
| DOI : 10.1007/s10533-004-2945-1 |
| Fiche détaillée |  Récupérer au format |
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| Biogeochemistry 74, 1 (2005) 101-114 |
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| Contribution of phytoliths to the suspended load of biogenic silica in the Nyong basin rivers (Cameroon) |
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| L. Cary 1A. Alexandre |
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| (05/2005) |
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| Particulate biogenic silica (BSi) carried by rivers to estuaries and marine sediments is generally assumed to be primarily composed of diatoms. Phytoliths-biogenic opal formed in plants-are found in some marine sediments where they are interpreted to be the result of atmospheric and river inputs. In this study, we evaluate the contribution of phytoliths to the suspended load of rivers of the Nyong basin (Cameroon). BSi (2 mu m to 2 mm fraction) in the soils and the rivers range respectively, from 0.9 to 3.9 wt% and from 1.3 to 4 wt%. About 90% of the BSi pool in both soils and river suspended load are composed of phytoliths. Thecamoebians and fresh water diatoms are minor components. The concentrations of BSi and the phytolith assemblages show great similarities between the waters and the soil samples. This result implies that the erosion of top soils is the major source of the suspended load, in good agreement with the transport-limited weathering regime of the study basin. |
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| 1 : | Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE) |
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CNRS : UMR6635 – Institut de recherche pour le développement [IRD] – INSU – Université de Provence - Aix-Marseille I – Université Paul Cézanne - Aix-Marseille III |
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| 2 : | Laboratoire des Mécanismes et Transfert en Géologie (LMTG) |
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CNRS : UMR5563 – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III – Institut de recherche pour le développement [IRD] : UMR154 |
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| Domaine | : | Planète et Univers/Sciences de la Terre |
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| biogenic silica – phytolith – weathering – erosion – Cameroon |
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| hal-00323571, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00323571 | |
| oai:hal.archives-ouvertes.fr:hal-00323571 | |
| Contributeur : Andy Senegas | |
| Soumis le : Lundi 22 Septembre 2008, 14:47:45 | |
| Dernière modification le : Lundi 22 Septembre 2008, 14:47:45 | |
