Isotopic evidence of lead sources in Loire River sediment - BRGM - Bureau de recherches géologiques et minières Accéder directement au contenu
Article Dans Une Revue Applied Geochemistry Année : 2012

Isotopic evidence of lead sources in Loire River sediment

Résumé

Sediments along the Loire River (central France) were investigated by means of Pb isotopes determined on the labile sediment fraction, or acid-extractable matter (AEM). The combination of trace elements and Pb isotopes allows deciphering the origin of the elements (i.e. natural or anthropogenic) and their history, in the sediment from two small watersheds (one draining basalt, the other one granite-gneiss), both in present-day suspended matter in Loire River water, and in sediment from the Loire estuary. Crustal weathering, as confirmed by the Pb-isotope ratios for most sample points, is the main source of Pb in the upstream part of the Loire River, as well as that transported in the middle part of the basin and in the estuary. Among anthropogenic sources, the use of Pb-isotopic compositions shows an influence of agriculturally-derived Pb inputs and a major input of Pb derived from gasoline, particularly in the estuary due to harbor activities.

Mots clés

Dates et versions

hal-00847798 , version 1 (24-07-2013)

Identifiants

Citer

Philippe Négrel, Emmanuelle Petelet-Giraud. Isotopic evidence of lead sources in Loire River sediment. Applied Geochemistry, 2012, 27 (10), pp.2019-2030. ⟨10.1016/j.apgeochem.2012.05.015⟩. ⟨hal-00847798⟩

Collections

BRGM BRGM-DO
55 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More