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Regional geochemical baselines for Portuguese shelf sediments.

M Mil-Homens1, R L Stevens, I Cato

  • 1Departamento de Geologia Marinha, Instituto Nacional de Engenharia, Tecnologia e Inovação, I.P., Estrada da Portela, Apartado 7586, 2721-866 Alfragide, Portugal. mario.milhomens@ineti.pt

Environmental Pollution (Barking, Essex : 1987)
|February 7, 2007
PubMed
Summary

This study analyzed metal concentrations in Portuguese shelf sediments from the 1970s and 2002. Most areas showed natural metal distributions, with minor anthropogenic enrichment near the Tejo River.

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Area of Science:

  • Environmental Geochemistry
  • Marine Geology

Background:

  • Historical sediment data from the 1970s provides a baseline for metal concentrations.
  • Portuguese shelf sediments exhibit distinct oceanographic and sedimentological characteristics between the western and Algarve coasts.

Purpose of the Study:

  • To assess metal concentrations (Al, Cr, Cu, Ni, Pb, Zn) in Portuguese shelf sediments.
  • To establish regional geochemical baselines (RGB) and identify anthropogenic metal enrichments.
  • To compare metal distributions in sediments from the 1970s with recent samples from 2002.

Main Methods:

  • Analysis of archived DGM-INETI sediment data from 267 sites (1970s).
  • Definition of regional geochemical baselines (RGB) using aluminum as a reference element.
  • Superposition of 2002 seabed samples onto RGB models to detect metal enrichments.
  • Calculation of enrichment factors (EF) to quantify metal anomalies.

Main Results:

  • Regional geochemical baselines were established for western and Algarve shelf segments.
  • Three samples near the Tejo River showed anthropogenic metal enrichment (EF(Pb)<3, EF(Zn)<4).
  • Most other studied areas exhibited enrichment factors close to 1, indicating natural metal origins.

Conclusions:

  • Sediment metal distributions on the Portuguese shelf are largely natural.
  • Minor anthropogenic metal inputs were detected near the Tejo River.
  • Historical data analysis is crucial for understanding long-term environmental changes in marine sediments.