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Polyphase karst system in Cretaceous chalk and calcarenite of the Belgian-Dutch border .

L. Willems 1 J. Rodet 2 Matthieu Fournier 2 Benoît Laignel 2 M. Dusar D. Lagrou André Pouclet 3 Nicolas Massei 2 L. Dussart-Baptista P. Compere C. Ek
1 Laboratoire de sédimentologie, Dpt Géologie-Pétrologie-Géochimie
2 M2C - Morphodynamique Continentale et Côtière
3 ISTO - Institut des Sciences de la Terre d'Orléans
Abstract : Along the Belgian-Dutch border, underground and surface quarries dug in Cretaceous calcarenite and chalk intersect many karst features as well as deep large nodes of weathered rock. Their observation allows the reconstruction of the genesis of an original karst system resulting from the merging of initially independent endokarsts and exokarsts. Deep weathering has developed within the Cretaceous formations, creating nodes of weathered chalk and closed cavities. These phenomena are expanded over time and can form interconnected voids. Near the surface, solution pipes are generated under the coarsest deposits of a fluvial terrace capping the Cretaceous formations. These pipes develop vertically and may be related to the progressive lowering of the water table in connection with the incision of the Meuse valley. Some of these phenomena cut up the older endokarsts and organize complex systems of out-flow within the chalk.
Keywords : FRANCE ORNE NETWORK
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Journal articles
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https://hal-insu.archives-ouvertes.fr/insu-00192962
Contributor : Nathalie Pothier <>
Submitted on : Friday, November 30, 2007 - 9:02:02 AM
Last modification on : Monday, April 27, 2020 - 4:26:29 PM

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  • HAL Id : insu-00192962, version 1

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Citation

L. Willems, J. Rodet, Matthieu Fournier, Benoît Laignel, M. Dusar, et al.. Polyphase karst system in Cretaceous chalk and calcarenite of the Belgian-Dutch border .. Annales de Géomorphologie / Annals of Geomorphology / Zeitschrift für Geomorphologie, Schweizerbart und Borntraeger, 2007, 51 (3), pp.361-376. ⟨insu-00192962⟩

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