MORENO, L., VIVEIROS, F., COUTO, R., SILVA, C., RANGE, P., GERALDES, D., PACHECO, J.E. (2016) – Chemical composition of submarine degassing areas in São Miguel Island (Azores archipelago). Actas das 4as Jornadas de Engenharia Hidrográfica

Para este site funcionar correctamente necessita ter o JavaScript activado.Clique aqui para ver como se activa no seu navegador

For this site to work properly JavaScript needs to be enabled.Click here to learn how to enable it on your browser

Artigos em livros de atas ► Nacionais

Referência Bibliográfica

MORENO, L., VIVEIROS, F., COUTO, R., SILVA, C., RANGE, P., GERALDES, D., PACHECO, J.E. (2016) – Chemical composition of submarine degassing areas in São Miguel Island (Azores archipelago). Actas das 4as Jornadas de Engenharia Hidrográfica, Instituto Hidrográfico, 317-319.

Resumo

Several secondary manifestations of volcanism are found in the Azores archipelago including subaerial and submarine hydrothermal fumaroles. This work shows the chemical composition of some submarine degassing vents located offshore of São Miguel Island, namely close to Porto Formoso, Ribeira Quente and Mosteiros villages. The samples were collected during the summers of 2013 and 2014 and spring of 2015. Analytical procedures included gas chromatography for the gases in the headspace of the Giggenbach bottles (CH₄, N₂, O₂, Ar, He and H₂) andtitration for those dissolved in the alkaline solution (CO₂ and H₂S). The dry phase is dominated by CO₂ with more than 99 molar%. N₂, O₂ and Ar are also detected in minor amountsin all the samples, whereas H₂S and H₂ are present only in some of them. Characterization of these degassing emissions is important to identify and quantify the gases emitted and to identify future signals of volcanic activity.

Observações

Anexos

< Voltar