Wrench-Related Dome Formation and Subsequent Orogenic Syntax Bending in a Hot Orogen (Variscan Ibero-Armorican Arc, the Ouessant Island, France)

Type Article
Date 2019-10
Language English
Author(s) Authemayou Christine1, Le Gall Bernard1, Caroff MartialORCID1, Bussien Grosjean Denise2
Affiliation(s) 1 : Univ Brest, CNRS, Geosci Ocean, UMR6538, Plouzane, France.
2 : Quartier UNIL Dorigny, Musee Cantonal Geol, Batiment Anthropole, Lausanne, Switzerland.
Source Tectonics (0278-7407) (Amer Geophysical Union), 2019-10 , Vol. 38 , N. 10 , P. 3563-3585
DOI 10.1029/2018TC005189
WOS© Times Cited 6
Keyword(s) Variscan, Armorican massif, gneiss dome formation, wrenching, orogenic syntax, Ouessant Island
Abstract

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.

Full Text
File Pages Size Access
Publisher's official version 23 14 MB Open access
Top of the page

How to cite 

Authemayou Christine, Le Gall Bernard, Caroff Martial, Bussien Grosjean Denise (2019). Wrench-Related Dome Formation and Subsequent Orogenic Syntax Bending in a Hot Orogen (Variscan Ibero-Armorican Arc, the Ouessant Island, France). Tectonics, 38(10), 3563-3585. Publisher's official version : https://doi.org/10.1029/2018TC005189 , Open Access version : https://archimer.ifremer.fr/doc/00637/74906/