Soil gas prospection of He,222Rn and CO2: Vulcano Porto area,Aeolian Islands,Italy |
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| Institution: | 1. Univ. P&M Curie, UPMC-Paris 06, UMR 7193, ISTeP, Laboratoire de Pétrologie, Géochimie, Volcanologie, 4 place Jussieu, 75230 Cedex 05 Paris, France;2. Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Univ Paris Diderot, UMR 7154 CNRS, 1 rue Jussieu, 75238 Cedex 05 Paris, France;3. OVSG-IPGP, Observatoire Volcanologique et sismologique de la Soufrière de Guadeloupe, IPGP, Le Houëlmont, 91173 Guadeloupe, France;1. Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, United States;2. College of Earth, Ocean, and Atmospheric Science, Oregon State University, Corvallis, OR, United States |
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| Abstract: | In March 1994, soil gases were sampled in the area of Vulcano Porto, on the island of Vulcano, using a grid of about 200 points/km2. Analysed gases were CO2, He and222Rn and, over a smaller area, H2S. Some of the samples were also analysed for the isotope composition of CO2 C. Three anomalous CO2 degassing areas were identified: Grotta dei Palizzi, the area near the Telephone Exchange, and the area near the beach fumaroles. The behaviour of He and222Rn is different in these 3 areas. The concentration of He is much lower than that of atmospheric He (down to ?3950 ppb) in the isthmus, and only in the area near Grotta dei Palizzi does it have values significantly higher than atmospheric ones (up to 1900 ppb). The activity of222Rn, always significantly positively related to CO2 concentrations, peaked in the 2 fumarole areas (isthmus, Telephone Exchange). |
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