FN Archimer Export Format
PT J
TI Wrench-Related Dome Formation and Subsequent Orogenic Syntax Bending in a Hot Orogen (Variscan Ibero-Armorican Arc, the Ouessant Island, France)
BT 
AF AUTHEMAYOU, Christine
   LE GALL, Bernard
   CAROFF, Martial
   BUSSIEN GROSJEAN, Denise
AS 1:1;2:1;3:1;4:2;
FF 1:;2:;3:;4:;
C1 Univ Brest, CNRS, Geosci Ocean, UMR6538, Plouzane, France.
   Quartier UNIL Dorigny, Musee Cantonal Geol, Batiment Anthropole, Lausanne, Switzerland.
C2 UBO, FRANCE
   QUARTIER UNIL DORIGNY, SWITZERLAND
UM LGO
IF 3.543
TC 10
UR https://archimer.ifremer.fr/doc/00637/74906/75947.pdf
LA English
DT Article
DE ;Variscan;Armorican massif;gneiss dome formation;wrenching;orogenic syntax;Ouessant Island
AB During the Carboniferous collision stage, the West European Variscan orogen was affected by oblique convergence, wrenching, plate-scale oroclinal bending, and widespread exhumation of the deep crust. One of these exhumed units forms the Leon dome located on the northern flank of the Ibero-Armorican Arc in the western part of the Armorican massif. Structural field data from the Ouessant Island reveal kinematic changes between 330 and 300 Ma that affected the northwestern margin of the Leon dome. This margin underwent two ductile deformation phases with opposite strike-slip shear senses. Dextral strike-slip wrenching combined with orogen-normal shortening, orogen-parallel stretching, and local top-to-the-NE shearing occurred during the Leon dome formation and exhumation of its gneissic core at 330-310 Ma. During tightening of the Ibero-Armorican Arc at similar to 300 Ma, more localized sinistral wrenching reactivated the northwestern boundary of the Leon dome. The resulting N70 degrees E trending sinistral Porspoder-Ouessant shear zone together with its conjugate dextral South Armorican shear zone controlled the lateral escape of the Leon-North-Central Armorican rigid tectonic wedge triggered by indentation of the Cantabrian orocline at the core of the Ibero-Armorican Arc. 
PY 2019
PD OCT
SO Tectonics
SN 0278-7407
PU Amer Geophysical Union
VL 38
IS 10
UT 000497909700004
BP 3563
EP 3585
DI 10.1029/2018TC005189
ID 74906
ER

EF