en
Scientific article
Open access
French

Le karst à remplissage de sables quartzeux sidérolithiques du Mont Girod

Publication date1966
Abstract

During Eocene times, a lateritic cover was formed, soon to be destroyed by erosion, and whose last traces are to be found in karstic cavities, down into which the material has been drawn. These laterites are almost entirely composed of kaolinite. At a later stage, the percolation of waters in the karst creates different physico-chemical conditions, and initiates a new evolutionary cycle. The environment becomes neutral or weakly acid, and well drained kaolinite is destroyed through the effect of migration "per descendum". Waters containing silica and alumina allow the local neoformation of kaolinite and halloysite (example : specimen No. 206). Accessorily or rather seasonally, centrifugal migration brings silica and alumina into contact with alcaline and alcali-calcic cations freed through the alteration of the calcareous walls; in this environment of a locally alcaline type, illite, a mixed-layer mineral of the illite-montmorillonite type, and exceptionally vermiculite, may recrystallise.

NoteTexte en français, avec résumé en anglais
Affiliation Not a UNIGE publication
Citation (ISO format)
VERNET, Jean-Pierre. Le karst à remplissage de sables quartzeux sidérolithiques du Mont Girod. In: Schweizerische mineralogische und petrographische Mitteilungen, 1966, vol. 46, n° 2, p. 357–366. doi: 10.5169/seals-36130
Main files (1)
Article (Published version)
accessLevelPublic
Identifiers
ISSN of the journal0036-7699
179views
21downloads

Technical informations

Creation11/26/2020 9:01:00 AM
First validation11/26/2020 9:01:00 AM
Update time03/15/2023 11:40:52 PM
Status update03/15/2023 11:40:52 PM
Last indexation01/17/2024 11:53:57 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack