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Authors: Barde-Cabusson, S.* 
Finizola, A.* 
Revil, A.* 
Ricci, T.* 
Piscitelli, S.* 
Rizzo, E.* 
Angeletti, B.* 
Balasco, M.* 
Bennati, L.* 
Byrdina, S.* 
Carzaniga, N.* 
Crespy, A.* 
Di Gangi, F.* 
Morin, J.* 
Perrone, A.* 
Rossi, M.* 
Roulleau, E.* 
Suski, B.* 
Villeneuve, N.* 
Title: New geological insights and structural control on fluid circulation in La Fossa cone (Vulcano, Aeolian Islands, Italy)
Journal: Journal of Volcanology and Geothermal Research 
Series/Report no.: /185(2009)
Publisher: Elsevier
Issue Date: 2009
DOI: 10.1016/j.jvolgeores.2009.06.002
Keywords: electrical resistivity
soil CO2 degassing
fluid circulation
hydrothermal system
structural boundary
La Fossa cone
Subject Classification03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring 
03. Hydrosphere::03.03. Physical::03.03.02. General circulation 
04. Solid Earth::04.01. Earth Interior::04.01.01. Composition and state 
04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniques 
04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques 
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 (b20 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 preexisting structures on hydrothermal fluid circulation at the scale of a volcanic edifice.
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