Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/10322
AuthorsRizzo, A. L.* 
Caracausi, A.* 
Chavagnac, V.* 
Nomikou, P.* 
Polymenakou, P. N.* 
Mandalakis, M.* 
Kotoulas, G.* 
Magoulas, A.* 
Castillo, A.* 
Lampridou, D.* 
TitleKolumbo submarine volcano (Greece): An active window into the Aegean subduction system
Issue Date17-Jun-2016
Series/Report no./6 (2016)
DOI10.1038/srep28013
URIhttp://hdl.handle.net/2122/10322
KeywordsKolumbo
submarine volcano
3He/4He
volcanic gases
hydrothermal system
volcanic arc
Aegean
Greece
MORB
mantle
Santorini
crustal contamination
Subject Classification03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems 
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics 
04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes 
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics 
04. Solid Earth::04.07. Tectonophysics::04.07.08. Volcanic arcs 
04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
05. General::05.02. Data dissemination::05.02.01. Geochemical data 
AbstractSubmarine volcanism represents ~80% of the volcanic activity on Earth and is an important source of mantle-derived gases. These gases are of basic importance for the comprehension of mantle characteristics in areas where subaerial volcanism is missing or strongly modified by the presence of crustal/atmospheric components. Though, the study of submarine volcanism remains a challenge due to their hazardousness and sea-depth. Here, we report 3He/4He measurements in CO2–dominated gases discharged at 500 m below sea level from the high-temperature (~220 °C) hydrothermal system of the Kolumbo submarine volcano (Greece), located 7 km northeast off Santorini Island in the central part of the Hellenic Volcanic Arc (HVA). We highlight that the mantle below Kolumbo and Santorini has a 3He/4He signature of at least 7.0 Ra (being Ra the 3He/4He ratio of atmospheric He equal to 1.39×10−6), 3 Ra units higher than actually known for gases-rocks from Santorini. This ratio is also the highest measured across the HVA and is indicative of the direct degassing of a Mid-Ocean-Ridge- Basalts (MORB)-like mantle through lithospheric faults. We finally highlight that the degassing of high-temperature fluids with a MORB-like 3He/4He ratio corroborates a vigorous outgassing of mantlederived volatiles with potential hazard at the Kolumbo submarine volcano.
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