Geologica Belgica

1374-8505 2034-1954

 

Impact factor: 0.739 (2016)

since 05 February 2011 :
View(s): 1076 (17 ULiège)
Download(s): 403 (5 ULiège)
print          
Dominique JACQUES, Tine DEREZ, Philippe MUCHEZ & Manuel SINTUBIN

Regional significance of non-cylindrical folding in the northwestern part of the High-Ardenne slate belt (Redu-Daverdisse, Belgium)

Article Open Access

Attached document(s)

Version PDF originale

Annexes

Abstract

Regional mapping and a detailed geometric analysis of complex, mixed brittle-ductile, fold-related accommodation structures, along the well-exposed banks of the Lesse river between Redu and Daverdisse (Belgium), reveal that the finite strain in the predominantly incompetent Lower Devonian rock sequence in the northwestern part of the High-Ardenne slate belt deviates from pure flattening and approximates plane strain. This finite strain is materialised by different manifestations of non-cylindrical folding, i.e. regional en-echelon and periclinal fold geometries, mesoscale non-cylindrical folds with hinges showing variable plunges, oblique flexural slip and local non-axial planar, transecting cleavage. The observed non-cylindrical folding fits in the regional framework of the Meuse Valley Recess, a transpressional corridor in the Ardenne allochthon that developed on top of a buried, buttressing oblique ramp in the pre-structural basement. Differential propagation in the overriding Ardenne allochthonuous domain to the east and west of this buttressing oblique ramp led to a component of lateral shortening on top of the ramp, resulting in the rotation of the overall structural grain and the development of en-echelon, non-cylindrical folds. Our study suggests that the Meuse Valley Recess can be continued towards the southeast, at least affecting the northern parts of the High-Ardenne slate belt.

Keywords : En-echelon periclinal folds ; non-axial planar, transecting cleavage; oblique flexural slip; plane strain; sediment architecture; Meuse Valley Recess

To cite this article

Dominique JACQUES, Tine DEREZ, Philippe MUCHEZ & Manuel SINTUBIN, «Regional significance of non-cylindrical folding in the northwestern part of the High-Ardenne slate belt (Redu-Daverdisse, Belgium)», Geologica Belgica [En ligne], volume 17 (2014), number 3-4, 252-267 URL : http://popups.ulg.ac.be/1374-8505/index.php?id=4641.

About: Dominique JACQUES

Geodynamics and Geofluids Research Group, Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E box 2410, B-3001 Leuven. E-mail: dominique.jacques@ees.kuleuven.be

About: Tine DEREZ

Geodynamics and Geofluids Research Group, Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E box 2410, B-3001 Leuven.

About: Philippe MUCHEZ

Geodynamics and Geofluids Research Group, Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E box 2410, B-3001 Leuven.

About: Manuel SINTUBIN

Geodynamics and Geofluids Research Group, Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E box 2410, B-3001 Leuven.