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http://hdl.handle.net/2122/5537
Authors: | Spampinato, Letizia* Salerno, G.G.* Martin, R.S.* Sawyer, G.M.* Ramírez, C.* Ilyinskaya, E.* Oppenheimer, C.* |
Title: | Degassing pathways through the shallow magmatic-hydrothermal system of Poás | Issue Date: | Dec-2009 | Keywords: | Thermal imagery, SO2 flux traverses, FTIR measurements, Particle composition, Poás volcano |
Subject Classification: | 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems | Abstract: | We report results from a multidisciplinary campaign carried out at Poás crater-lake (Costa Rica) on 17-18 March 2009. Thermal imagery of fumaroles on the north side of the dome and the lake surface revealed mean apparent temperatures of 25-40°C (maximum of 80°C), and 30-35°C (maximum of 48°C), respectively. Mean radiative heat output of the lake, uncorrected for downwelling flux, was estimated as ~230 MW. The mean SO2 flux emitted by the crater measured by walking-traverses was 76 tonnes day-1, with approximately equal contributions from both the dome and the lake and fumarole plumes. Gas measurements by active open-path FTIR spectroscopy indicated molar ratios of H2O/SO2 = 151 and CO2/SO2 = 1.56. HCl and HF were not detected in measured spectra but based on the detection limits of these species, we calculate SO2/HCl > 40, and SO2/HF > 200. Particles were sampled from the plume by air filtration. The filters were analysed using ion chromatography, which revealed an abundance of K+ and SO42-, with smaller amounts of Ca2+, Mg2+ and Cl-. We discuss here the implications of the results for degassing pathways through the shallow magmatic-hydrothermal system. |
Appears in Collections: | Conference materials |
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Spampinato et al., 2009.pdf | Conference abstract | 97.17 kB | Adobe PDF | View/Open |
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