Article Dans Une Revue Geologica Belgica Année : 2006

CONTRIBUTION OF A SEDIMENTARY STUDY TO THE CONCEPT OF KARSTIC EVOLUTION OF A CHALK CAVE IN THE WESTERN PARIS BASIN (NORMANDY, FRANCE)

Résumé

The Petites Dales cave is a favourable site for studying the sedimentary fill of the karst in the chalk of Normandy. O e study of the fill is based on the lithological characterization and mineralogical and chemical comparison between the karstic sediments and the likely sedimentary sources (insoluble residue of chalk, clay-with-fl ints, loess). Results show that there are three main families of sediment in the Petites Dales karst: brown clayey silts, beige silts, pale beige silts. The karst sediments essentially originate from the mechanical erosion of loess. The insoluble residue of chalk, derived from the weathering of the chalk, is only found in the brown clayey silts, and constitutes a weak amount of this sediment type. According to these results, three conceptual models are proposed for the hydrosedimentary behaviour of the Petites Dales karstic system that could have resulted in such an intra-karstic deposition sequence. O integration of the sedimentary data into the morphological study of the galleries and their arrangement contributes to the conceptualization of an evolutionary pattern of the underground network in its paleogeographic context.

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hal-04671529 , version 1 (15-08-2024)

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Joël Rodet, Benoît B. Laignel, Gilles Brocard, Emmanuel Dupuis, Nicolas Massei, et al.. CONTRIBUTION OF A SEDIMENTARY STUDY TO THE CONCEPT OF KARSTIC EVOLUTION OF A CHALK CAVE IN THE WESTERN PARIS BASIN (NORMANDY, FRANCE). Geologica Belgica, 2006, 9 (3-4), pp.287-296. ⟨hal-04671529⟩
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