Publication Date:
2012-02-03
Description:
An edited version of this paper was published by AGU. Copyright (2010) American Geophysical Union.
Description:
Aeromagnetic data collected between the Aeolian volcanoes (southern Tyrrhenian
Sea) and the Calabrian Arc (Italy) highlight a WNW‐ESE elongated positive magnetic
anomaly centered on the Capo Vaticano morphological ridge (Tyrrhenian coast of
Calabria), characterized by an apical, subcircular, flat surface. Results of forward
and inverse modeling of the magnetic data show a 20 km long and 3–5 km wide
magnetized body that extends from sea floor to about 3 km below sea level. The magnetic
properties of this body are consistent with those of the medium to highly evolved
volcanic rocks of the Aeolian Arc (i.e., dacites and rhyolites). In the Calabria mainland,
widespread dacitic to rhyolitic pumices with calc‐alkaline affinity of Pleistocene age
(1–0.7 Ma) are exposed. The tephra falls are related to explosive activity and show a
decreasing thickness from the Capo Vaticano area southeastward. The presence of lithics
indicates a provenance from a source located not far from Capo Vaticano. The combined
interpretation of the magnetic and available geological data reveal that (1) the Capo
Vaticano WNW‐ESE elongated positive magnetic anomaly is due to the occurrence
of a WNW‐ESE elongated sill; (2) such a sill represents the remnant of the plumbing
system of a Pleistocene volcano that erupted explosively producing the pumice tephra
exposed in Calabria; and (3) the volcanism is consistent with the Aeolian products,
in terms of age, magnetic signature, and geochemical affinity of the erupted products,.
The results indicate that such volcanism developed along seismically active faults
transversal to the general trend of the Aeolian Arc and Calabria block, in an area where
uplift is maximized (∼4 mm/yr). Such uplift could also be responsible for fragmentation
of the upper crust and formation of transversal faults along which seismic activity and
volcanism occur.
Description:
Published
Description:
B11101
Description:
3.2. Tettonica attiva
Description:
3.4. Geomagnetismo
Description:
5.7. Consulenze in favore di istituzioni nazionali e attività nell'ambito di trattati internazionali
Description:
JCR Journal
Description:
restricted
Keywords:
aeromagnetic anomalies
;
volcanic arc
;
tectonics of the Calabrian Arc
;
risk assessment
;
04. Solid Earth::04.02. Exploration geophysics::04.02.99. General or miscellaneous
;
04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies
;
04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism
;
04. Solid Earth::04.07. Tectonophysics::04.07.08. Volcanic arcs
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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