VIVEIROS, F.; CARDELLINI, C.; FERREIRA, T.; CALIRO, S.; CHIODINI, G.; SILVA, C.; PEDONE, M.; ANDRADE, C.; ZANON, V.; HIPÓLITO, A.R. (2015) - CO2 degassing zones in various volcanic systems of the Azores archipelago (Portugal)

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Painéis ► em encontros internacionais

Referência Bibliográfica

VIVEIROS, F.; CARDELLINI, C.; FERREIRA, T.; CALIRO, S.; CHIODINI, G.; SILVA, C.; PEDONE, M.; ANDRADE, C.; ZANON, V.; HIPÓLITO, A.R. (2015) - CO2 degassing zones in various volcanic systems of the Azores archipelago (Portugal) – continuous and discrete measurements. Deep Carbon Observatory – Second International Science Meeting, 26 a 28 de Março, Munique, Alemanha.

Resumo

CO₂ is one of the most abundant volcanic gases and is released not only during eruptive periods, but also during quiescent periods of activity.

This is the case of the various CO₂ emissions found in the Azores archipelago volcanic systems. In fact, and even if the last volcanic eruption occurred in 1998-2001, nowadays various secondary manifestations of volcanism are found on the islands and high amounts of hydrothermal/volcanic CO₂ are emitted, mainly through fumaroles and soil diffuse degassing areas.

Furnas volcano (São Miguel Island) shows high CO₂ emission, estimated to be about 1200 t d^-1, accounting with the contribution of the fumaroles, springs, lake and soil diffuse degassing areas. Soil diffuse degassing represents 90% of the total emission. More than 1010 t d^-1shows hydrothermal origin.

At Terceira Island, where a project grant in the scope of the DECADE initiative was developed in 2014, the CO₂emission was estimated to be 3 t d^-1 from an area with about 24700 m², and the presence of hydrothermal CO₂ was essentially associated with the area surrounding the only fumarolic ground of the island.

Carbon isotopic data (δ¹³C_CO2) of the sampled gases (soil fluxes, fumaroles and fluid inclusions) were used to discriminate different origins (biogenic vs. hydrothermal) for the CO₂.

A permanent network of seven soil CO₂ flux stations is also installed in the archipelago and time series show significant daily and seasonal variations related mainly with meteorological variables.

Observações

Anexos

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