Search results for "TECTONICS"

Mixed Carbonate Ramps: Tectonic and Palaeogeographic settings (Sicily, Southern Italy)

2014

Understanding paleomagnetic rotations in Sicily: Thrust vs. transpressive structures

2016

Since the 1970s, paleomagnetic data collected in Sicily have documented large magnitude clockwise (CW) rotations around vertical axis with respect to Africa and the Hyblean foreland. Many Authors argued that rotations arise from rotational thrusting of large coherent nappes coinciding with paleogeographic units. In the forward thrust propagation process, each nappe rotates the overlying nappe stack. This would explain the stepwise decrease of rotation magnitudes from the internal Panormide unit (90°-140°) to the external Saccense unit, yielding no rotation. However, other Authors later proposed that rotations of Sicily are the consequence of dextral shear occurring since late Miocene times …

Seismically-induced soft-sediment deformation structures in Upper Triassic deepwater carbonates (Central Sicily)

2016

We describe soft-sediment deformation structures into the Upper Triassic cherty limestone outcropping in the Pizzo Lupo section (Central Sicily, Italy), pertaining to the deep-water palaeodomain of the Southern Tethyan margin. In the study section, mainly consisting of thin-bedded mudstone/marl alternations with bedded chert intercalations, some lithofacies have been separated on the basis of the abundance of the calcium carbonate/clay content and the overall textural features. The deformational structures, displaying different deformational styles as folded and faulted beds, disturbed layers, clastic dikes, and slumps occur mainly in the deformed horizons that involve marl-dominated lithof…

A contribution to a seismotectonic model of the hinge zone between northern Sicily and southern Tyrrhenian by some seismological and structural const…

2013

An integrated research on the hinge zone between northern Sicily and its Tyrrhenian off-shore has been carried out, by means of structural, seismological and statistical analyses. The main structural features of the area are represented by both NWSE to W–E striking right-lateral and N–S to NE-SW striking leftlateral fault systems, responsible of uplifting (restraining) and subsiding (releasing) zones. Within this hinge zone the seismicity is mainly located between 10 and 20 km of depth and clustered according to the orientation of the outcropping fault systems. The brittle strain partitioning related to a right-lateral simple shear zone has been reconstructed in the onshore sector, while in…

From compression to exstension during the Sicily chain building

2009

Constraining the onset and development of "deep-seated" tectonics in the Sicilian thrust belt: field data from northern Sicily

2010

Mapping tectonics: a key element in submarine geological events and probabilities assessment

2016

Geothermal, hydro-structural and neo-tectonic features of the Sciacca basin

2012

LARGE LANDSLIDES AND NEOTECTONICS: A CASE STUDY IN WESTERN SICILY

2009

The study area is located in the western sector of the Sicanian Mounts where the superimposition, consequence of the Miocene and Lower Pliocene tectonic transpressive phases, of different geologic bodies, having vergence to the southern quadrants, can be observed. In this area, the neo-autochthonous deposits are given by marly-clayey sediments of middle-upper Pliocene, pertaining to the “Marnoso-arenacea” Formation of the Belice Valley, and by Pleistocene calcarenites. The recent extensional tectonic crisis (neotectonics) have further dissected and dismembered the original structural edifice, involving also the Pleistocene calcarenites, which show tectonic displacements mainly NE – SW orien…

STRATIGRAPHIC AND STRUCTURAL ANALYSIS OF A HIGH RESOLUTION SEISMIC SURVEY PERFORMED IN THE BAY OF AUGUSTA (SE SICILY)

2009

The Bay of Augusta is located along the NE margin of the Hyblean Plateau (SE Sicily). In this area a mostly bioclastic and terrigenous Quaternary succession outcrops. This area recorded a constant regional uplift rate of 50 kA. Two main groups of faults, referred to as the northwest and the southwest fault zones, are separated by a central zone where no evident fault planes have been imaged by seismic data. The faults in both groups strike from N30W to N52W and are also inferred to be steeply dipping. The faults pertaining to northwestern cluster show a very little offset, 50 kA. As concern the southeastern fault zone, results coming from radiocarbon age dating don’t have sufficient resolut…