Preliminary estimate of CO2 output from Pantelleria Island volcano (Sicily,Italy): evidence of active mantle degassing |
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| Institution: | 1. Dipartimento di Scienze della Terra, SAPIENZA Università di Roma, P.le A. Moro, 5, 00185 Roma, Italy;2. IGAG-CNR Istituto di Geologia Ambientale e Geoingegneria, Area della Ricerca Roma 1, Via Salaria km 29.300, 00016 Monterotondo Stazione Roma, Italy;3. ISPRA, Istituto Superiore Istituto Superiore per la Protezione e la Ricerca Ambientale, Via Vitaliano Brancati, 48, Roma, Italy;4. Istituto di Scienze Marine, ISMAR-CNR, Via Gobetti 101, 40129 Bologna, Italy;5. Dipartimento di Ingegneria Civile, Edile e Ambientale, SAPIENZA Università di Roma, Via Eudossiana 18, 00184 Roma, Italy;1. Research Center for Island Seas, Kobe University, Kobe 657-8501, Japan;2. Kobe Ocean-Bottom Exploration Center, Kobe University, Kobe 658-0022, Japan;1. Dipartimento di Scienze della Terra, dell''Ambiente e delle Risorse (DiSTAR), Università Federico II di Napoli, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia (INGV), Roma, Italy;3. M.EDU.S.A. s.r.l.u., Ischia, Italy;4. Istituto di Scienze Marine (ISMAR-CNR), Napoli, Italy |
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| Abstract: | Total CO2 output from fumaroles, bubbling and water dissolved gases and soil gases was investigated at Pantelleria Island volcano, Italy. The preliminary results indicate an overall output of 0.39 Mt a?1 of CO2 from the island. The main contribution to the total output was from diffuse soil degassing (about 0.32 Mt a?1), followed by dissolved CO2 (0.034 Mt a?1), focussed soil degassing (0.028 Mt a?1) and bubbling CO2 (0.013 Mt a?1). The contribution of CO2 from fumarole gases was found to be negligible (1.4×10?6 Mt a?1). Carbon-13 values for CO2 coupled with those for associated He in gases from fumaroles and sites of focussed soil degassing clearly rule out any significant organic CO2 component and suggest a common mantle origin for these gas species. The inferred mantle source beneath Pantelleria would seem to have peculiar geochemical characteristics, quite distinct from those of mantle producing MORB but compatible with those of magmatic sources of central Mediterranean and central European volcanoes. These findings indicate that the Pantelleria volcanic complex is a site of active mantle degassing that is worthy of attention for future geochemical surveillance of the island. |
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