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Authors: Lupton, J.* 
de Ronde, C.* 
Sprovieri, M.* 
Baker, E.* 
Bruno, P.* 
Italiano, F.* 
Walker, S.* 
Faure, K.* 
Leybourne, M.* 
Britten, K.* 
Greene, R.* 
Title: Active hydrothermal discharge on the submarine Aeolian Arc
Issue Date: Feb-2011
Series/Report no.: /116 (2011)
DOI: 10.1029/2010JB007738
Keywords: hydrothermal systems
Tyrrhenian sea
Subject Classification03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems 
Abstract: In November 2007 we conducted a water column and seafloor mapping study of the submarine volcanoes of the Aeolian Arc in the southern Tyrrhenian Sea aboard the R/V Urania. On 26 conductivity‐temperature‐depth casts and tows we measured temperature, conductivity, pressure, and light scattering and also collected discrete samples for helium isotopes, methane, and pH. The 3He/4He isotope ratio, an unambiguous indicator of hydrothermal input, showed a clear excess above background at 6 of the 10 submarine volcanoes surveyed. Marsili seamount had the highest anomaly, where the 3He/4He ratio reached a d3He value of 23% at 610 m depth compared with background values of ∼5%. Smaller but distinct d3He anomalies occurred over Palinuro, Enarete, Eolo, Sisifo, and Secca del Capo. Although hydrothermal emissions are known to occur offshore of some Aeolian subaerial volcanoes, and hydrothermal deposits have been sampled throughout the arc, our results are the first to confirm active discharge on Marsili, Enarete, Eolo, Sisifo, and Secca del Capo. Samples collected over Lametini, Filicudi North, Alicudi North, and Alcione had d3He near the regional background values, suggesting either absence of, or very weak, hydrothermal activity on these seamounts. Hydrocasts between the volcanoes revealed a consistent d3He maximum between 11% and 13% at 2000mdepth throughout the SE Tyrrhenian Sea. The volcanoes of the Aeolian arc and the Marsili back arc, all <1000 m deep, cannot contribute directly to this maximum. This deep 3He excess may be a remnant of tritium decay or may have been produced by an unknown deep hydrothermal source.
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