Geologica Belgica

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Ruth BECKERS

COMPARISON OF FOLDS IN THE CHEVLIPONT AND ABBAYE DE VILLERS FORMATIONS, NEAR THE ABBEY OF VILLERS, THYLE VALLEY, BRABANT MASSIF

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Mots-clés : Brabant Massif, Thyle valley, Chevlipont Formation, Abbaye de Villers Formation, tectonic folds, slump, folds, palaeoslope, cross-section

Abstract

In a detailed structural study in the   yle valley folds were studied in the Chevlipont and Abbaye deVillers formations. On the basis of cleavage/fold relationships and other criteria, the presence is demonstrated of both slump folds and tectonic folds. Apparently, a spatial relationship exists between the tectonic folds and slump folds. On the basis of the orientations of the slump folds the probable palaeoslope is determined for both formations: north-dipping for the Chevlipont Formation, south-dipping for the Abbaye de Villers Formation. This may refl ect a different basin geometry during deposition of these two formations. A structural cross-section is constructed on which a minimal thickness of 129.5 m is inferred for the Abbaye de Villers Formation. The cross-section also shows that the Abbaye deVillers Formation can be divided into a 119 m thick upper, southern part with thick, massive, S-dipping layers and a northern part of minimum 10.5 m thick, composed of thinner layers and containing numerous soft-sediment deformation features (slump folds and related features) as well as tectonic folds.

To cite this article

Ruth BECKERS, «COMPARISON OF FOLDS IN THE CHEVLIPONT AND ABBAYE DE VILLERS FORMATIONS, NEAR THE ABBEY OF VILLERS, THYLE VALLEY, BRABANT MASSIF», Geologica Belgica [En ligne], volume 7 (2004), number 3-4 - Proceedings of the 5th European Coal Conference, 357-359 URL : http://popups.ulg.ac.be/1374-8505/index.php?id=480.

About: Ruth BECKERS

Geological Survey of Belgium, Jennerstraat 13, B-1000 Brussel and U. Ghent, Krijgslaan 281-S8, B-9000 Gent.