Article (Scientific journals)
Sedimentology and magnetic susceptibility of the Couvin Formation (Eifelian, South Western Belgium): Carbonate platform initiation in a hostile world
Mabille, Cédric; Boulvain, Frédéric
2007In Geologica Belgica, 10 (1-2), p. 47-67
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Keywords :
Eifelian; Couvin Formation; type area; carbonate platform initiation
Abstract :
[en] The Eifelian of Belgium is mainly characterised by a mixed siliciclastic-carbonate sedimentation on a ramp profile. In this context, the Couvin Formation is the more important and remarkable exception. It represents a carbonate platform initiation in a hostile environment. This work is mainly based on the stratotype, corresponding to two stratigraphic sections located in Couvin, along the southern border of the Dinant Synclinorium. These sections are the Eau Noire and Falaise de l'Abime sections. Unfortunately, they are discontinuous. To allow a better understanding of the sedimentary dynamics, the data are complemented by a shorter but continuous section located in Villers-la-Tour (3.5 km West of Chimay). Petrographic study leads to the definition of 14 microfacies which are integrated in a palaeogeographical model. It corresponds to a platform setting where the reef complex is mainly constituted by an accumulation of crinoids, stromatoporoids and tabulate corals. The microfacies evolution is interpreted in terms of bathymetrical variations. It shows a general shallowing-upward trend encompassing the vertical succession of fore-reef settings, reef development, back-reef and then lagoon environment. This interpretation is supported by trends in mean magnetic susceptibility data, providing a better understanding of the sedimentary dynamics. Moreover, these data show positive correlation with concentrations of detritic minerals, but an inverse relationship with well washed skeletal limestones. The comparison of the three studied sections leads to considerations concerning the lateral variability in the Couvin Formation indicating more agitated conditions in the Abime Member in Villers-le-Tour section.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Mabille, Cédric ;  Université de Liège - ULiège > Département de géologie > Pétrologie sédimentaire
Boulvain, Frédéric  ;  Université de Liège - ULiège > Département de géologie > Pétrologie sédimentaire
Language :
English
Title :
Sedimentology and magnetic susceptibility of the Couvin Formation (Eifelian, South Western Belgium): Carbonate platform initiation in a hostile world
Publication date :
2007
Journal title :
Geologica Belgica
ISSN :
1374-8505
eISSN :
2034-1954
Publisher :
Geologica Belgica, Brussels, Belgium
Volume :
10
Issue :
1-2
Pages :
47-67
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 15 October 2008

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