title: Temporal evolution of lead isotope ratios in sediments of the Central Portuguese Margin: a fingerprint of human activities.
abstract: Stable Pb isotope ratios ((206)Pb/(207)Pb, (208)Pb/(206)Pb), (210)Pb, Pb, Al, Ca, Fe, Mn and Si concentrations were measured in 7 sediment cores from the west coast of the Iberian Peninsula to assess the Pb contamination throughout the last 200 years. Independently of their locations, all cores are characterized by increasing Pb/Al rends not related to grain-size changes. Conversely, decreasing trends of (206)Pb/(207)Pb were found towards the present. This tendency suggest a change in Pb sources reflecting an increased proportion derived from anthropogenic activities. The highest anthropogenic Pb inventories for sediments younger than 1950s were found in the two shallowest cores of Cascais and Lisboa submarine canyons, reflecting the proximity of the Tagus estuary. Lead isotope signatures also help demonstrate that sediments contaminated with Pb are not constrained to estuarine-coastal areas and upper parts of submarine canyons, but are also to transferred to a lesser extent to deeper parts of the Portuguese Margin.
authors.affiliation: Instituto Português do Mar e da Atmosfera, I.P., Divisão de Oceanografia Ambiental e Bioprospecção, Av. Brasília, 1449-006 Lisboa, Portugal. Electronic address: mario.milhomens@ipma.pt.
authors.forename: Mário
authors.initials: M
authors.lastname: Mil-Homens
authors.forename: Miguel
authors.initials: M
authors.lastname: Caetano
authors.forename: Ana M
authors.initials: AM
authors.lastname: Costa
authors.forename: Susana
authors.initials: S
authors.lastname: Lebreiro
authors.forename: Thomas
authors.initials: T
authors.lastname: Richter
authors.forename: Henko
authors.initials: H
authors.lastname: de Stigter
authors.forename: Maria A
authors.initials: MA
authors.lastname: Trancoso
authors.forename: Pedro
authors.initials: P
authors.lastname: Brito
mesh_terms: D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D006802:Human Activities; D006801:Humans; D007554:Isotopes / Q000032:analysis; D007854:Lead / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D007554:Isotopes; D014874:Water Pollutants, Chemical; D007854:Lead
keywords: Anthropogenic Pb enrichments; Central Portuguese Margin; Pb isotopes; Sediments; Submarine canyons; Temporal evolution