GMC - Comunicações em actas de encontros científicos internacionais
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- Characterization of the continental shelf of Faial and Pico islands (Azores) using chirp echo characterPublication . Quartau, Rui; Teixeira, F. Curado; Bouriak, Serguei; Monteiro, José Hipólito; Pinheiro, Luís M.
- Sand resources on the continental shelf of Faial Island (Azores)Publication . Quartau, Rui; Teixeira, F. Curado; Monteiro, José Hipólito; Cunha, Tiago A.; Pinheiro, Luís M.; Cardigos, Frederico
- "La Grande Vasière" mid-shelf mud belt : Holocene sedimentary structure, natural and anthropogenic impactsPublication . Bourillet, Jean-François; Jouanneau, Jean-Marie; Macher, Claire; Le Hir, Pierre; Naughton, Filipa
- Tectono-estratigrafia do Neogénico das margens S e SW portuguesas : um modelo de correlação sismostratigráficaPublication . Roque, Ana Cristina; Terrinha, Pedro; Pinheiro, Luís M.; Zitellini, Nevio
- Sismostratigrafia dos contornitos da margem do Algarve : eventos deposicionais, tectónicos e hidrológicos no Pliocénico Superior-PlistocénicoPublication . Roque, Ana Cristina; Terrinha, Pedro
- 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.
- Traceability statement for the determination of total chromium fraction in serpentine soils by atomic absorption spectrometryPublication . Trancoso, Maria Ascensão; Alves, Sheila; Santos, M. M. Correia dosThe purpose of this work is to contribute for the metrological traceability statement of chemical measurements. Traceability statement for total chromium mass fraction in serpentine soils was developed. Accordingly, the quantity values requiring a high degree of control are calibration and quality control standard solutions, matrix certified reference material and the calibration curve model fit.
- 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.
- Alterações recentes nas razões isotópicas de Pb em sedimentos do Canhão Submarino de Cascais, PortugalPublication . Mil-Homens, Mário; Caetano, M.; Lebreiro, Susana; Costa, A. M.; Richter, T.; Cesário, R.; Brito, Pedro Oliveira; De Stigter, H.; Boer, Wim; Trancoso, Maria Ascensão; Mouro, F.Temporal variations in lead concentrations and stable lead isotopic ratios in two sediment cores from the Cascais Canyon shows changes in sources of Pb during the last two centuries. The increase of total Pb contents wIth the evolution of Pb ratio recorded in both cores reveals the Increase of Pb from industrial sources. Nevertheless, this increase is lower in deeper core location (252-32) due to dilution and mixing with uncontaminated marine materials. An isotopic shift towards lower Pb/Pb in the shallower core (252-35) during the 1970s may reflect the increasing number of vehicles in the Lisboa area during that time.
- Morphostructure of the Tore Seamount and evidences of recent tectonic activity (West Iberia Margin)Publication . Roque, Ana Cristina; Terrinha, Pedro; Lourenço, Nuno; Abreu, M. Pinto de
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