Les roches karstifiables de la Province de Hainaut

in De Broyer, Claude (Ed.) Atlas du Karst wallon, Province de Hainaut (1995)

La nouvelle grotte de Dinant

Book published by Lesire (1990)

Des traces de glace de ségrégation dans la grotte de Remouchamps (Belgique) : conséquences en ce qui concerne la sédimentation et la paléoclimatologie

in Annales de la Société Géologique de Belgique (1988), 111

In countries with a modern temperate climate, the extent of former permafrost is generally estimated from the observation of ice wedge casts, remnants of pingos and palsas, and periglacial involutions ... [more ▼]

In countries with a modern temperate climate, the extent of former permafrost is generally estimated from the observation of ice wedge casts, remnants of pingos and palsas, and periglacial involutions. These features give no indication at all about the depth of permafrost and are ineffective in identifying the limits of former permafrost. A new tool for this research may be found in caves. We already know that speleothems did not grow -- or grew little — during the colder periods of the last glaciation, probably because of the impervious nature of the frozen ground. The discovery, in the Remouchamps Cave, of the marks of segregation ice in loose fills proves that the temperature did fall below 0°C. Only one cycle of freeze/thaw would have been sufficient to create these marks wich have been preserved because there was indeed little biological activity in this environment. The temperature in such caves is generally very close to the mean annual temperature outside the caves. This evidence will thus be useful for tracing the southern limit of the permafrost in Europe. When the permafrost thawed, the melting of the ice caused mass movements in the cave sediments. The ice had blocked some passages and water levels rose to abnormally high levels, depositing sediments at these levels. [less ▲]

Les concrétions carbonatées des grottes : aperçu synthétique

in Annales de la Société Géologique de Belgique (1988), 111

A synthetic overview of the scientific work on calcium carbonate cave deposits (dripstones and flowstones) over the last twenty years is carried out. More particularly, recent studies on speleothems ... [more ▼]

A synthetic overview of the scientific work on calcium carbonate cave deposits (dripstones and flowstones) over the last twenty years is carried out. More particularly, recent studies on speleothems composition, growth, age and paleoclimatic environment are examined. Main new results are in relation with the development of isotopic and radiometric dating methods which together with other research fields like palynology and tephrostratigraphy make speleothem a first choice material for the study of Late and Upper Quaternary. Beside geomorphological contributions — including Belgian results on maximum rates of valleys entrenchment and deepening — increasing number of dates allow for statistical speleothem repartition studies which could be related with paleoclimates. Two new frequency curves of U-series ages data of speleothems are presented. [less ▲]

Carbon dioxide of the air of shallow caves in mountainous areas

in International Symposium on the Problems of Karst Study in Mountainous Countries (1987)

De la connaissance du milieu karstique à sa gestion

in Annales de la Société Géologique de Belgique (1985)

Progress in rational use of karst and its proper management is influenced by the exchange of relevant information in all the concerned spheres. It is also dependant on the setting up of global projects ... [more ▼]

Progress in rational use of karst and its proper management is influenced by the exchange of relevant information in all the concerned spheres. It is also dependant on the setting up of global projects involving a systemic approach. Impact studies are presented as a positive means of finding long term solutions to the land management of karst areas. This of course can only be achieved if the authors of the impact studies are neither dependant on nor controlled by the developers of a specific project. [less ▲]

Carbon dioxide in cave atmospheres. New results in Belgium and comparison with some other countries.

in Earth Surface Processes & Landforms (1985), 10

More than 600 measurements of the carbon dioxide content of cave air in Belgium lead up to the conclusion that the main factors of its distribution are: (1) a flow originating from the biomass and ... [more ▼]

More than 600 measurements of the carbon dioxide content of cave air in Belgium lead up to the conclusion that the main factors of its distribution are: (1) a flow originating from the biomass and diffusing in the soil and the voids of bedrock; (2) a trend, discernible in very still air only, to go down by density; (3) in some caves, draughts caused, for instance, by a swift underground stream. Results in Belgium are compared with published and unpublished data from other countries, showing that CO2 is often less abundant in cold climate caves and in caves of semi-arid regions (influence of the biomass). Special attention is paid to human contamination during analyses: the influence of people passing through the cave nearby the operator, but also the influence of the operator himself, are discussed, and the use of special precautions (including a CO2-absorbing mask) in defined critical situations is stressed. [less ▲]

L'eau dans le vallon des chantoirs (Remouchamps) : une leçon sur les collaborations nécessaires

in Hydrographica (1983), 1-2/1983

Les phénomènes karstiques

in Pissart, Albert (Ed.) Géomorphologie de la Belgique. Hommage au Professeur P. Macar (1976)

Karstic phenomena are abundant in Belgium in Devonian and Carboniferous limestones. They exist also in a Permian formation; they are less noticeable in Jurassic and Cretaceous formations. Surface features ... [more ▼]

Karstic phenomena are abundant in Belgium in Devonian and Carboniferous limestones. They exist also in a Permian formation; they are less noticeable in Jurassic and Cretaceous formations. Surface features are abundant, and numerous caves have been studied. The ages of karstic phenomena are very variable. Some are even palaeozoic; some are mesozoic and mesozoic, but the most obvious are mainly quaternary and even present-day features. [less ▲]

FACTEURS, PROCESSUS ET MORPHOLOGIE KARSTIQUES DANS LES CALCAIRES PALÉOZOÏQUES DE LA BELGIQUE

Doctoral thesis (1969)

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