Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/826
Título: Submarine Cascais Canyon as a sediment conduit to the deep sea : comparison with adjacent slopes
Autor: Costa, A. M.
Mil-Homens, Mário
Lebreiro, Susana
De Stigter, H.
Richter, T.
Boer, Wim
Trancoso, Maria Ascensão
Melo, Zenaida
Mouro, F.
Mateus, M
Palavras-chave: Contaminação de águas
Sedimentos marinhos
Elementos maiores
Metais pesados
Canhão Submarino de Cascais (Portugal)
Margem Continental Portuguesa
Data: Dez-2009
Citação: Costa, A. M.; Mil-Homens, Mário; Lebreiro, Susana; De Stigter, H.; Richter, T.; Boer, Wim; Trancoso, M. Ascenção; Melo, Zenaida; Mouro, F.; Mateus, M. - Submarine Cascais Canyon as a sediment conduit to the deep sea : comparison with adjacent slopes. In: 6º Simposio sobre el Margen Ibérico Atlántico : MIA 09, Oviedo, 1-5 de diciembre de 2009
Resumo: Submarine 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.
URI: http://hdl.handle.net/10400.9/826
Aparece nas colecções:GMC - Comunicações em actas de encontros científicos internacionais

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
33789.pdf227,05 kBAdobe PDFVer/Abrir


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.