Helium Isotopic Ratio In Vulcano Island Fumaroles- Temporal Variations In Shallow Level Mixing And Deep Magmatic Supply

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Journal Article: Helium Isotopic Ratio In Vulcano Island Fumaroles- Temporal Variations In Shallow Level Mixing And Deep Magmatic Supply

Abstract
Intensive gas emanations occur throughout the island of Vulcano, Italy. Sharp fluctuations recorded in the crater gas composition suggest the presence of two separate volcanic reservoirs and continuous mixing with another source, "crustal" waters. This mixing differs between the beach and crater fumaroles. Gas samples from three crater fumaroles with temperatures ranging from 200 to 550°C were sampled repeatedly over a one year period. During the same interval of time, six samples from submarine and subaerial beach fumaroles and water well gases were also sampled. Gases from one crater fumarole (F5) showed variations of (3He/4He)fumarole to (3He/4He)air between 5 and 6 correlated with variations of several chemical species. High 3He/4He ratios for the beach fluids, similar to those of crater fluids, suggest the existence of a unique large magmatic reservoir at depth feeding both the crater and beach intermediate reservoirs. However, temporal changes clearly indicate variable degrees of fluids mixing, and the geographic distribution of the 3He/4He ratios as well as the chemical composition of the fluids suggest the existence between the magma reservoir and the surface of two intermediate different reservoirs, independently related to crater and to beach fumaroles.

Authors 
Dario Tedesco, Gerarda Miele, Yuji Sano and Jean Paul Toutain








Published Journal 
Journal of Volcanology and Geothermal Research, 1995





DOI 
Not Provided
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Citation

Dario Tedesco,Gerarda Miele,Yuji Sano,Jean Paul Toutain. 1995. Helium Isotopic Ratio In Vulcano Island Fumaroles- Temporal Variations In Shallow Level Mixing And Deep Magmatic Supply. Journal of Volcanology and Geothermal Research. (!) .