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http://hdl.handle.net/2122/10322
Authors: | Rizzo, A. L.* Caracausi, A.* Chavagnac, V.* Nomikou, P.* Polymenakou, P. N.* Mandalakis, M.* Kotoulas, G.* Magoulas, A.* Castillo, A.* Lampridou, D.* |
Title: | Kolumbo submarine volcano (Greece): An active window into the Aegean subduction system | Journal: | Nature Scientific Reports | Series/Report no.: | /6 (2016) | Issue Date: | 17-Jun-2016 | DOI: | 10.1038/srep28013 | Keywords: | Kolumbo submarine volcano 3He/4He volcanic gases hydrothermal system volcanic arc Aegean Greece MORB mantle Santorini crustal contamination |
Subject Classification: | 03. 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 |
Abstract: | Submarine 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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