FN Archimer Export Format
PT J
TI LiDAR offshore structural mapping and U/Pb zircon/monazite dating of Variscan strain in the Leon metamorphic domain, NW Brittany
BT 
AF LE GALL, Bernard
   AUTHEMAYOU, Christine
   EHRHOLD, Axel
   PAQUETTE, Jean-Louis
   BUSSIEN, Denise
   CHAZOT, Gilles
   AOUIZERAT, Arthur
   PASTOL, Yves
AS 1:1;2:1;3:2;4:3,4;5:1;6:1;7:1;8:5;
FF 1:;2:;3:PDG-REM-GM-LES;4:;5:;6:;7:;8:;
C1 Inst Univ Europeen Mer, UMR CNRS6538, Domaines Ocean, F-29280 Plouzane, France.
   IFREMER, Ctr Brest, Unite Rech GM, Lab Environm Sedimentaires, F-29280 Plouzane, France.
   CNRS, UMR6524, Lab Magmas & Volcans, F-63038 Clermont Ferrand, France.
   Univ Clermont Ferrand, F-63038 Clermont Ferrand, France.
   Serv Hydrog & Oceanog Marine, F-29228 Brest, France.
C2 UBO, FRANCE
   IFREMER, FRANCE
   CNRS, FRANCE
   UNIV CLERMONT FERRAND, FRANCE
   SHOM, FRANCE
SI BREST
SE UBOIUEM
   PDG-REM-GM-LES
   PDG-REM-GM-LGM
   AUTRE
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.872
TC 22
TU CNRS
   IFREMER
   IRD
   SCEF HYDROGRAPH OCEANOGRAPHIQUE MARINE
   UNIVERSITE BREST
   UNIVERSITE BRETAGNE-SUD
   UNIVERSITE CLERMONT FERRAND
   UNIVERSITE CLERMONT-FERRAND 2
   UNIVERSITE SAINT-ETIENNE
UR https://archimer.ifremer.fr/doc/00194/30490/28895.pdf
LA English
DT Article
CR HALAMACOU
   HALAMACOU 2
   MEDON
   THALAMACOU
BO Haliotis
   Thalia
DE ;Armorican massif;Leon metamorphic domain;Offshore structural mapping;LiDAR records;Dextral ductile shearing;U/Pb zircon/monazite dating
AB 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.
PY 2014
PD SEP
SO Tectonophysics
SN 0040-1951
PU Elsevier Science Bv
VL 630
UT 000341548900020
BP 236
EP 250
DI 10.1016/j.tecto.2014.05.026
ID 30490
ER

EF