Maurice Bourgoin Laurence, Gasc F., Seyler Patrick, Elbaz Poulichet E. (1999). Trace elements distribution in the Andean sub-basins of the Madeira river : role of the weathering processes in the freshwaters geochemistry. In :
Guyot Jean-Loup (ed.). Manaus'99 : hydrological and geochemical processes in large scale river. s.l. : s.n., 7 p., multigr. Manaus'99 - Hydrological and Geochemical Processes in Large Scale River Basins, Manaus (BRA), 1999/11/16-19.
Titre du document
Trace elements distribution in the Andean sub-basins of the Madeira river : role of the weathering processes in the freshwaters geochemistry
Année de publication
1999
Type de document
Colloque
Auteurs
Maurice Bourgoin Laurence, Gasc F., Seyler Patrick, Elbaz Poulichet E.
In
Guyot Jean-Loup (ed.), Manaus'99 : hydrological and geochemical processes in large scale river
Source
s.l. : s.n., 1999,
7 p., multigr
Colloque
Manaus'99 - Hydrological and Geochemical Processes in Large Scale River Basins, Manaus (BRA), 1999/11/16-19
The distribution of trace elements was investigated in surface waters in two upper Amazonian basins. Three main factors of the geochemical characterisation of the rivers explained mainly by weathering and dilution processes, are: substrate lithology, mining activities, and organic content. The dissolved elements reflects the lithological differences between the Mamore and Beni basin. Andean tributaries of the Mamore R. are characterised by high concentrations of Mn, Sr, Mo, Bas and U while high concentrations of As Zn, Cd and Cs characterise tributaries of the Bani R. Dissolved Sr, Ba, Mo, Rb, U correlate with major ions and appear to be predominantly derived from soluble rocks. Inflence of the shale erosion explain the high concentrations of V, Zn, Cu and Pb measured in Beni tributaries. The high values of Co, Ni and Mn reflects the Palaeozoic detritical series from the drainage basin of the Tipuani and Challana rivers. The higher content of Mn in the Ichilo river may reflects the predominance of carbonate rocks. Regarding to the antropogenic influence, the high Zn, As, and Cd concentrations measured in the Taquesi river can be explained by important mining activities. (Résumé d'auteur)
Plan de classement
Pollution continentale [038POLCON]
Descripteurs
METAL LOURD ; COURS D'EAU ; DISTRIBUTION ; EXPLOITATION DU SOUS SOL ; GEOCHIMIE ; EROSION ; ELEMENT EN TRACE ; ANTHROPISATION ; ROCHE CARBONATEE
Description Géographique
BOLIVIE ; ANDES
Localisation
Fonds IRD [F B010025632] ;
La Paz
Identifiant IRD
fdi:010025632
