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Maria F. Loreto Nevio Zitellini Csar R. Ranero Camilla Palmiotto Manel Prada 《Basin Research》2021,33(1):138-158
We 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. 相似文献
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An evolved system of North-South trending rotational normal faults records the direction of a stretching event on the Tyrrhenian Sea continental margins.Evolutionary stages of a typical rifted basin are recognized in the Tyrrhenian Sea through the interpretative analysis of seismic data, A major unconformity marks the end of a quite short (Tortonian to middle-Pliocene) rifting phase. However, no well-developed drift-related structures are seen to be active during the deposition of the post-rift sequence. 相似文献
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