Texture of the sediments of the Petit Lac (Western Lake Geneva)

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Reference

Texture of the sediments of the Petit Lac (Western Lake Geneva)

VERNET, Jean-Pierre, et al.

Abstract

Les analyses sédimentologiques de 98 échantillons du Petit Lac (partie ouest du Léman) montrent que les sédiments de ce lac sont constitués essentiellement par des mélanges de sable et de silt avec accessoirement des argiles. Les variations dans la répartition des paramètres granulométriques suggèrent que les sédiments de ce lac peuvent être considérés comme des silts avec une très faible teneur en argiles. Cette matrice de silt/argile est diluée d'une façon très variable par des apports de sable. Le sable et la matrice silt/argile peuvent être considérés comme les deux populations extrêmes. Toutes deux sont «lepto-curtiques»

mais avec un indice d'asymétrie de signe opposé. Les variations de la taille moyenne, d'asymétrie et de classement, sont donc reliées aux variations du mélange de ces populations. Le type de mélange dépend de l'énergie de l'environnement qui, dans le cas présent, montre que les caractéristiques du sédiment sont conformes à un modèle simplifié lié à la bathymétrie du lac. Des études précédentes ont montré que les sédiments de la fraction silteuse sont [...]

VERNET, Jean-Pierre, et al. Texture of the sediments of the Petit Lac (Western Lake Geneva).

Eclogae Geologicae Helvetiae, 1972, vol. 65, no. 3, p. 591-610

DOI : 10.5169/seals-164107

Available at:

http://archive-ouverte.unige.ch/unige:145078

Disclaimer: layout of this document may differ from the published version.

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