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Provedor de dados:  ArchiMer
País:  France
Título:  LiDAR offshore structural mapping and U/Pb zircon/monazite dating of Variscan strain in the Leon metamorphic domain, NW Brittany
Autores:  Le Gall, Bernard
Authemayou, Christine
Ehrhold, Axel
Paquette, Jean-louis
Bussien, Denise
Chazot, Gilles
Aouizerat, Arthur
Pastol, Yves
Data:  2014-09
Ano:  2014
Palavras-chave:  Armorican massif
Leon metamorphic domain
Offshore structural mapping
LiDAR records
Dextral ductile shearing
U/Pb zircon/monazite dating
Resumo:  An exceptional structural picture of the immerged Variscan basement, offshore the Leon metamorphic domain, is supplied by high-resolution LiDAR and echosounder data recorded in the Molene archipelago, western Brittany (France). Various types of fabrics are identified and, from in situ rock sample analyses further combined with field structural data, are interpreted on a lineament trajectory map as the trace of magmatic and tectonic structures. Our onshore/offshore study leads us to propose a two-phase kinematic model that emphasizes the role of a strike-slip duplex in an EW-trending relay zone linking the North Armorican and Pierres Noires ductile shear zones (NASZ, PNSZ). Dextral shearing occurred within a transtensional setting, synchronously with magmatic intrusions (St-Renan granite and an offshore gabbro-diorite complex) dated at 314-320 Ma by new U-Th/Pb ages. It post-dated an early regional foliation related to top-to-the-NE ductile transpresional shearing. Our study emphasizes the key role of strike-slip tectonics in the NW part of the Armorica Variscan belt.
Tipo:  Text
Idioma:  Inglês

Editor:  Elsevier Science Bv
Formato:  application/pdf
Fonte:  Tectonophysics (0040-1951) (Elsevier Science Bv), 2014-09 , Vol. 630 , P. 236-250
Direitos:  2014 Elsevier B.V. All rights reserved.


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