New geological insights and structural control on fluid circulation in La Fossa cone (Vulcano,Aeolian Islands,Italy) |
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| Authors: | S Barde-Cabusson A Finizola A Revil T Ricci S Piscitelli E Rizzo B Angeletti M Balasco L Bennati S Byrdina N Carzaniga A Crespy F Di Gangi J Morin A Perrone M Rossi E Roulleau B Suski N Villeneuve |
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| Institution: | 1. Dipartimento di Scienze della Terra, Università Degli Studi di Firenze, Italy;2. LMV, Université Blaise Pascal, Clermont-Ferrand, France;3. Laboratoire GéoSciences Réunion, UR, IPGP, UMR 7154, Saint-Denis, La Réunion, France;4. Istituto Nazionale di Geofisica e Vulcanologia, Palermo, Italy;5. Colorado School of Mines, Dept. of Geophysics, Golden, CO, USA;6. CNRS-LGIT (UMR 5559), University of Savoie, Equipe Volcan, Chambéry, France;g Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy;h IMAA-CNR, Laboratory of Geophysics Tito Scalo (PZ), Italy;i CNRS-CEREGE, Université Paul Cézanne, Aix en Provence, France;j Dept. of Earth & Atmospheric Sciences, Purdue University, West Lafayette, USA;k Equipe de Géomagnétisme, IPGP, UMR 7154, 4, Place Jussieu, 75005 Paris, France;l Università Milano-Bicocca, Milan, Italy;m Université Paris 1, Panthéon-Sorbonne, Paris, France;n Dipartimento di Geoscienze, Università di Padova, Italy;o GEOTOP-UQAM-McGill, Montréal, Canada;p Université de Lausanne (UNIL), Institut de Géophysique, Lausanne, Switzerland;q Institut de Recherche pour le Développement, US 140 ESPACE, La Réunion, France |
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| Abstract: | Electric resistivity tomography (ERT), self-potential (SP), soil CO2 flux, and temperature are used to study the inner structure of La Fossa cone (Vulcano, Aeolian Islands). Nine profiles were performed across the cone with a measurement spacing of 20 m. The crater rims of La Fossa cone are underlined by sharp horizontal resistivity contrasts. SP, CO2 flux, and temperature anomalies underline these boundaries which we interpret as structural limits associated to preferential circulation of fluids. The Pietre Cotte crater and Gran Cratere crater enclose the main hydrothermal system, identified at the centre of the edifice on the base of low electrical resistivity values (<20 Ω m) and strong CO2 degassing, SP, and temperature anomalies. In the periphery, the hydrothermal activity is also visible along structural boundaries such as the Punte Nere, Forgia Vecchia, and Palizzi crater rims and at the base of the cone, on the southern side of the edifice, along a fault attributed to the NW main tectonic trend of the island. Inside the Punte Nere crater, the ERT sections show an electrical resistive body that we interpret as an intrusion or a dome. This magmatic body is reconstructed in 3D using the available ERT profiles. Its shape and position, with respect to the Pietre Cotte crater fault, allows replacing this structure in the chronology of the development of the volcano. It corresponds to a late phase of activity of the Punte Nere edifice. Considering the position of the SP, soil CO2 flux, and temperature maxima and the repartition of conductive zones related to hydrothermal circulation with respect to the main structural features, La Fossa cone could be considered as a relevant example of the strong influence of pre-existing structures on hydrothermal fluid circulation at the scale of a volcanic edifice. |
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| Keywords: | electrical resistivity self-potential soil CO2 degassing temperature fluid circulation hydrothermal system structural boundary Vulcano La Fossa cone |
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