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Extensional tectonics during the Tyrrhenian back-arc basin formation and a new morpho-tectonic map

AuthorsLoreto, Maria Filomena; Zitellini, Nevio; Ranero, César R. CSIC ORCID; Palmiotto, Camilla; Prada, Manel CSIC ORCID
Issue DateFeb-2021
PublisherEuropean Association of Geoscientists and Engineers
CitationBasin Research 33(1): 138-158 (2021)
AbstractWe present a new tectonic map focused upon the extensional style accompanying the formation of the Tyrrhenian back-arc basin. Our basin-wide analysis synthetizes the interpretation of vintage multichannel and single-channel seismic profiles, integrated with modern seismic images, P-wave velocity models, and high-resolution morpho-bathymetric data. Four distinct evolutionary phases of the Tyrrhenian back-arc basin opening are further constrained, redefining the initial opening to Langhian/Serravallian time. Listric and planar normal faults and their conjugates bound a series of horst and graben, half-graben and triangular basins. Distribution of extensional faults, active throughout the basin since Middle Miocene, allows us to define an arrangement of faults in the northern/central Tyrrhenian mainly related to a pure shear which evolved to a simple shear opening. At depth, faults accommodate over a Ductile-Brittle Transitional zone cut by a low-angle detachment fault. In the southern Tyrrhenian, normal, inverse and transcurrent faults appear to be related to a large shear zone located along the continental margin of the northern Sicily. Extensional style variation throughout the back-arc basin combined with wide-angle seismic velocity models allows to explore the relationships between shallow deformation, faults distribution throughout the basin, and crustal-scale processes as thinning and exhumation
Description21 pages.-- The data that support the findings of this study are available from Banca Dati Crop. Restrictions apply to the availability of these data, which were used under license for this study. Data are available at with the permission of the CROP DATABASE Project Manager
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Identifiersissn: 0950-091X
e-issn: 1365-2117
Appears in Collections:(ICM) Artículos

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