Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5086
AuthorsSano, Y.* 
Wakita, H.* 
Nuccio, P. M.* 
Italiano, F.* 
TitleHELIUM ISOTOPES AND TECTONICS IN SOUTHERN ITALY
Issue DateJun-1989
Series/Report no.6/16 (1989)
URIhttp://hdl.handle.net/2122/5086
Keywordshelium isotopes
tectonics
Subject Classification04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 
AbstractGeodynamic evolution of southern Italy can be understood within the framework of the Mediterranean- Alpine System. Subduction of a plate along the Sicily- Calabrian forearc under the Tyrrhenian Sea has been suggested by many geophysicists, although it is not yet confirmed and remains somewhat controversial. Helium isotope ratios provide useful information on the geotectonic structure of the region. We report here the 3He/4He ratios of terrestrial gas samples from southern Italy. The observed 3He/4He ratios are relatively high in the Eolian volcanic arc region and low in the other areas. Dichotomous explanations are presented. Firstly volcanic arc-forearc hypothesis suggests the subduction along the Sicily-Calabrian forearc. Secondly horizontal transport hypothesis is described based on the relationship between the ratios and radial distance from the recent spreading basin in Southern Tyrrhenian Sea.
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