Publication Date:
2021-07-14
Description:
Field geological data of the Pantelleria Island, a large Late Quaternary volcano located in the Sicily Channel rift zone, integrated with
offshore geophysical information, are used to derive the structural setting of the Island and the surrounding region, and to analyse the
relationships between tectonics and magmatism. Field work shows that the principal faults exposed on the Island fall into two systems trending
NNE–SSW and NW–SE. Mapped faults from offshore multichannel seismic profiles show similar trends, and some of them represent the
offshore extension of the Pantelleria Island structures. The NW–SE faults bound the Pantelleria Graben, one of the three main depressions
formed since the Late Miocene–Early Pliocene within the African continental platform, which compose the Sicily Channel rift zone. A 3-D
Moho depth geometry, derived from inversion of Bouguer gravity data, shows a significant uplift of the discontinuity up to 16–17 km beneath
the westernmost part of the Pantelleria Graben and beneath the Pantelleria Island; it lows rapidly to 24–25 km away from the graben northeastward
and south-westward. The Moho uplift could explain the presence of a shallow magma chamber in the southern part of the Island,
where processes of magmatic differentiation are documented. Geological and geophysical data suggest that the northwestern part of the Sicily
Channel is presently dominated by a roughly E–W directed extensional regime. Crustal cracking feeding the Quaternary volcanism could be
also related to this extensional field that would be further responsible for the development of the N–S trending volcanic belt that extends in the
Sicily Channel from Lampedusa Island to the Graham Bank. This mode of deformation is confirmed also by geodetic data. This implies that in
the northwestern part of the Sicily Channel, the E–W extension replaced the NE–SW crustal stretching that originated the NW-trending
tectonic depressions constituting the rift zone.
© 2008 Elsevier B.V. All rights reserved.
Description:
Published
Description:
32-46
Description:
3.2. Tettonica attiva
Description:
JCR Journal
Description:
reserved
Keywords:
Pantelleria Island
;
Channel rift zone
;
structural analysis
;
Quaternary volcanism
;
gravity modelling
;
tectonic extension
;
04. Solid Earth::04.04. Geology::04.04.09. Structural geology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
