Études sédimentologiques dans la Chandelar

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Reference

Études sédimentologiques dans la Chandelar

BERSIER, Arnold, VERNET, Jean-Pierre

Abstract

La meilleure coupe stratigraphique de la Molasse aquitanienne de Lausanne (Molasse d'eau douce inférieure) est celle du ravin de la Chandelar, à l'Est de la ville. La série est affectée par l'axe anticlinal du Plateau et la grande faille limitant Molasse aquitanienne tabulaire et Molasse chattienne subalpine. Le profil étudié ici, comprenant plus de 90 couches, est celui du flanc SE de l'anticlinal jusqu'à la faille. L'étude sédimentologique montre que les couches de grès, macignos et marnes, à variations latérales rapides, sont groupées en unités cycliques à granodécroissance verticale, dont le dépôt a été précédé d'érosions et remaniements. C'est le cas habituel d'un bassin limno-palustre alimenté par cours divagants.

Au point de vue pétrographique, les grès des Molasses aquitaniennes et chattiennes sont facilement confondus. Toutefois les analyses qui suivent montrent une nette différence entre les teneurs en minéraux lourds et en minéraux légers des grès aquitaniens affleurant dans la Chandelar et celles des grès chattiens au-delà de la faille, dans la Paudèze. L'Aquitanien, dont [...]

BERSIER, Arnold, VERNET, Jean-Pierre. Études sédimentologiques dans la Chandelar.

Bulletin de la Société vaudoise des Sciences naturelles, 1964, vol. 68, no. 314, p.

455-465

DOI : 10.5169/seals-275460

Available at:

http://archive-ouverte.unige.ch/unige:145212

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

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