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The sedimentary filling in the chalk karst of the Northwestern Paris Basin (Normandy, France): Characterization, origin and hydro-sedimentary behaviour

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Karst networks can be considered as zones of alteration, storage volumes of eroded material and also as zones of transit. Study of sedimentary fillings in karst allows to determine past hydrodynamic conditions as well as sediment sources. In order to better understand chalk karst genesis differents sedimentary fillings from Northwestern Paris Basin have been studied: Petites Dales, Villequier II and Orival caves. Geochemical (major elements) and grain size analysis explain the sedimentary variability both within and between sites. This can be explained by the variation of two main parameters: (i) the origin of karst sediments and (ii), the hydrodynamic conditions in the karst system. Karstic sediments can origininated (i) from allochtonous materials associated with surperficial deposits (quaternary loess, tertiary sand deposits, or a mixture of them), or (ii) from autochtonous material related to chalky residual deposit (in situ weathering). Three main deposit conditions are distinguished according to the sedimentological characteristics: flood, low flow and medium hydrodynamic conditions. A conceptual model is proposed (i) to explain hydrosedimentary conditions in undercovered chalk karst and (ii), to relate surface (plateaus) and underground (karst) geomorphological comparments in term of sediment reworking, transport and sedimentation.
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Keywords: CHALK KARST; CONCEPTUAL MODEL; HYDROSEDIMENTARY DYNAMIC; NORMANDY; NORTHWESTERN PARIS BASIN; SEDIMENT SOURCES; SEDIMENTARY FILLINGS

Document Type: Research Article

Publication date: 2015-03-01

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  • Zeitschrift für Geomorphologie main volume is a peer-reviewed international journal presenting original contributions of high scientific standard from all fields of geomorphology, encompassing basic research and applied studies. Zeitschrift für Geomorphologie (ZfG) invites the submission of original papers from the entire field of geomorphological research, both applied and theoretical. Authors are encouraged to submit their papers to the editor-in-chief. Please peruse the instructions to authors (PDF) before submitting your paper.

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