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RESEARCH PRODUCT
Helium isotopes and tectonics in southern Italy
Mario P. NuccioFrancesco ItalianoYuji SanoHiroshi Wakitasubject
geographygeography.geographical_feature_categorySubductionVolcanic arcEarth scienceStructural basinTectonicsPaleontologyGeophysicsVolcanoGeneral Earth and Planetary SciencesCompression (geology)Isotopes of heliumForearcGeologydescription
Geodynamic 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. The authors report here the {sup 3}H/{sup 4}He ratios of terrestrial gas samples from southern Italy. The observed {sup 3}He/{sup 4}He 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1989-06-01 | Geophysical Research Letters |