pingo; Brackvenn; rempart; cicatrice; étude; coupe
Abstract :
[fr] Des observations relatives à la composition et à la disposition des conches dans le rempart d'une cicatrice de pingo amènent à l'idée que ce rempart s'est constitué sous l'effet d'une poussée profonde induite par apparition de glace de ségrégation.
La granulométrie et l'étude des minéraux denses et des minéraux argileux ont permis de reconnaître dans les diverses couches la part des matériaux d'altération du substrat et des matériaux allochtones.
Un niveau de poussières volcaniques d'une composition originale non encore reconnue en Belgique a été identifié et situé par la palynologie après l'Interstade d'Arcy-Stillfried B.
Observations concerning the composition and arrangement of the beds in a rampart of a pingo scar suggest that this rampart was formed under the influence of thrusting induced by formation of deep segregation ice.
The relative importance of allochthonous materials and those formed by weathering of the substrate has been determined by study of the granulometry, heavy minerals and clay minerals.
A layer of volcanic dust previously unknown in Belgium has been identified. Using palynological techniques it can be situated after the Arcy-Stillfried B interstadial.
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