Publication Date:
2017-04-04
Description:
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. 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.
Description:
Published
Description:
511-514
Description:
3.2. Tettonica attiva
Description:
JCR Journal
Description:
open
Keywords:
helium isotopes
;
tectonics
;
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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