Publication Date:
2022-05-24
Description:
The presence of a seamount-like structure, located a few
nautical miles offshore the Capo Vaticano Promontory (western
Calabria, S Italy), was revealed by combined geophysical
and geochemical investigation. The edifice covers ~55 km2,
with a top located at a depth of about 70 m below sea
level, and consists mainly of a NW-trending structure orthogonally
interrupted by minor ridges, the largest of which is
affected by extensional faults. The top of the edifice hosts
active vents, injected fluids that have been investigated for
dissolved volatiles. Gas analyses revealed high CO2 and
CH4 contents, several orders of magnitude above the
atmospheric-type values expected for shallow, coastal marine
waters, and a noteworthy enrichment in mantle-derived 3He,
which is an unambiguous indicator of the mantle origin of
the fluids. Our results, combined with available data from
the literature, suggest that the edifice is a tectonically controlled
volcanic system, which presence near the Calabria
region changes the role played by faults in the frame of the
subduction process.
Description:
Published
Description:
195 – 205
Description:
5V. Dinamica dei processi eruttivi e post-eruttivi
Description:
JCR Journal
Keywords:
Submarine degassing
;
dissolved gas geochemistry
;
mantle degassing
;
volcanic structure
;
Mantle degassing on a near shore submarine volcano, SE Tyrrhenian Sea
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
