The southern Tyrrhenian Sea margin:an example of lithospheric scale strike-slip duplex
2010
The southern Tyrrhenian Sea margin is dominated by deformations
whose kinematics are relatively poorly constrained, and different
models have been proposed to account for its recent evolution. Analysis
of new structural and space geodesy data, combined with available
geophysical information, reveal a deformation field characterised by
subhorizontal NW-SE directed shortening and SW-NE directed extension.
The main recognised regional-scale structure comprises E-W
trending fault zones, namely the Ustica-Eolie Line and the Mt. Kumeta-Alcantara Line, connected by the NW-SE trending Marettimo,
Trapani, San Vito, Palermo, Gratteri-Mt. Mufara and Eolie
faults. This fault network displays a remarkable dextral strike-slip
character, and has the features of a strike-slip duplex, that we indicate
as the Southern Tyrrhenian Strike-Slip Duplex (STSSD). Analysis of
available geophysical data and regional considerations based on platetectonic
reconstructions suggest that the STSSD is a primary feature
of lithospheric-scale importance. Our strike-slip duplex model differs
significantly from previously proposed passive margin interpretations
for the Tyrrhenian Sea margin offshore northern Sicily. The results of
this investigation show the effectiveness of an integrated, multidisciplinary
approach in the study of active deformation margins
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