Browsing by Author "Melo, Zenaida"
Now showing 1 - 6 of 6
Results Per Page
Sort Options
- Mercury contamination in sediment cores off the Portuguese MarginPublication . Mil-Homens, Mário; Canário, J.; Costa, A.; Lebreiro, Susana; Branco, Vasco; Trancoso, Maria Ascensão; Melo, Zenaida; De Stigter, H.; Richter, T.
- Multi-parameter characterization of surface sediments from the Minho estuaryPublication . Mil-Homens, Mário; Costa, Ana Novo; Lopes, Cristina Isabel; Duarte, Henrique; Rodrigues, Teresa; Santos, Célia Teresa; Silva, Ana Aranda; Mateus, Sandra; Cavaleiro, Catarina; Abrantes, Fátima; Fonseca, Sandra; Serrano, Raquel; Trancoso, Maria Ascensão; Sousa, Rita; Mateus, Manuela; Melo, Zenaida
- Pb enrichments in short sediment cores collected off the Portuguese MarginPublication . Costa, Ana Novo; Mil-Homens, Mário; Lebreiro, Susana; Trancoso, Maria Ascensão; Melo, Zenaida; Mouro, Filomena; De Stigter, Henko; Boer, Win; Richter, Thomas; Van Weering, Tjeerd C. E.; Abrantes, Fátima
- Submarine Cascais Canyon as a sediment conduit to the deep sea : comparison with adjacent slopesPublication . Costa, A. M.; Mil-Homens, Mário; Lebreiro, Susana; De Stigter, H.; Richter, T.; Boer, Wim; Trancoso, Maria Ascensão; Melo, Zenaida; Mouro, F.; Mateus, MSubmarine canyons are known to be important conduits that trap, accumulate and deliver both natural and anthropogenic sediments from the shelf to the deep sea. Ten multi-cores from the Cascais Canyon and from the neighbour slopes (off Estremadura and Sines) were dated by 21Opb methodologies and analyzed for texture, major and trace metals to evaluate the role of submarine canyons in the transport of anthropogenic metals to the abyssal plains. Higher accumulation mass rates were determined in the upper Cascais Canyon than in the lower canyon and slopes. Enrichment factors (EF) were used to evaluate the level of metal enrichment in the studied areas. EF values exceeding natural background concentrations were obtained for Pb suggesting an anthropogenic and/or diagenetic source for Pb enrichment in the Cascais Canyon, but also, to a lesser extent, in the Estremadura and Sines slopes. Studies of provenance based on the ratio of different stable Pb isotopes can help to determinethe origin of such metal in the sediments.
- Submarine Cascais Canyon as a sediment conduit to the deep sea :comparasion with adjacent slopesPublication . Costa, A. M.; Mil-Homens, Mário; Lebreiro, S. M.; Stigter, H. de; Richter, T.; Boer, Wim; Trancoso, Maria Ascensão; Melo, Zenaida; Mouro, Filomena C.; Mateus, M.
- Tracing anthropogenic Hg and Pb input using stable Hg and Pb isotope ratios in sediments of the central Portuguese MarginPublication . Mil-Homens, Mário; Blum, Joel; Canário, João; Caetano, Miguel; Costa, Ana Novo; Lebreiro, Susana; Trancoso, Maria Ascensão; Richter, Thomas; Stigter, Henko de; Johnson, Marcus; Branco, Vasco; Cesário, Rute; Mouro, Filomena; Mateus, Manuela; Boer, Wim; Melo, Zenaida