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Provedor de dados:  ArchiMer
País:  France
Título:  Active tectonics of the Calabrian subduction revealed by new multi-beam bathymetric data and high-resolution seismic profiles in the Ionian Sea (Central Mediterranean)
Autores:  Gutscher, Marc-andre
Kopp, Heidrun
Krastel, Sebastian
Bohrmann, Gerhard
Garlan, Thierry
Zaragosi, Sebastien
Klaucke, Ingo
Wintersteller, Paul
Loubrieu, Benoit
Le Faou, Yann
San Pedro, Laurine
Dominguez, Stephane
Rovere, Marzia
De Lepinay, Bernard Mercier
Ranero, Cesar
Sallares, Valenti
Data:  2017-03
Ano:  2017
Palavras-chave:  Subduction
Active faults
Eurasia-Africa plate boundary
Seismic profiles
Accretionary wedge
Resumo:  The detailed morphology and internal structure of the Calabrian accretionary wedge and adjacent Eastern Sicily margin are imaged in unprecedented detail by a combined dataset of multi-beam bathymetry and high-resolution seismic profiles. The bathymetric data represent the results of 6 recent marine geophysical surveys since 2010 as well as a compilation of earlier surveys presented as a 2 arc-sec (60 m) grid. Several distinct morpho-tectonic provinces are identified including: the deeply incised Malta–Hyblean Escarpment, numerous submarine canyons, broad regions of relatively flat seafloor dominated by fields of sediment waves, the gently undulating anticlinal fold-and-thrust belts of the external Calabrian accretionary wedge and the adjacent portion of the Western Mediterranean Ridge. The Calabrian arc can be divided into 4 domains (from SE to NW): 1) the undeformed Ionian abyssal plain, 2) the external evaporitic wedge, 3) the internal clastic wedge, 4) the Calabrian backstop (Variscan crystalline basement). The Calabrian accretionary wedge can also be divided laterally into two major lobes, the NE- and the SW lobes, and two minor lobes. The kinematics of the limit between the two major lobes is investigated and shown to be sinistral in the external (evaporitic) wedge. A network of radial slip lines within the southernmost external wedge unequivocally demonstrate ongoing dextral displacement of a rigid indenter (representing the corner of the clastic wedge) into the evaporitic wedge thereby confirming the geodynamic model of an active lateral slab tear fault here off eastern Sicily. The slab tear produces a series of major sub-parallel dextral strike-slip faults offshore Mt. Etna and south of the Straits of Messina consistent with the relative motions between Calabria and the Peloritan domain (NE Sicily). Abundant strike-slip faulting, and wide-spread folding and thrusting observed throughout the entire accretionary wedge, indicate regional shortening between the Ionian abyssal plain (foreland) and the Calabrian–Peloritan backstop caused by active subduction.
Tipo:  Text
Idioma:  Inglês

Editor:  Elsevier Science Bv
Relação:  info:eu-repo/grantAgreement/EC/FP7/603839/EU//ASTARTE
Formato:  application/pdf
Fonte:  Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2017-03 , Vol. 461 , P. 61-72
Direitos:  2016 Elsevier B.V. All rights reserved.


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