Minéraux argileux et vermiculite-AI dans quelques sols et arènes des Vosges. Hypothèse sur la néoformation des minéraux à 14 Å
- 1 January 1968
- journal article
- research article
- Published by PERSEE Program in Bulletin du Service de la carte géologique d'Alsace et de Lorraine
- Vol. 21 (4) , 285-304
- https://doi.org/10.3406/sgeol.1968.1346
Abstract
The inventory of the clay minerals present in soils and «arènes » of the crystalline Vosges Mountains is carried on herein. The occurence of an aluminum intergrade (Al-vermiculite), considered up to now as a (vermiculite-chlorite) mixed layer has been pointed out. Illite, identified in soils, is not an authigenic clay mineral but a product inherited from the primary micas of rocks and from sericite, probably formed in the zone of retrodiagenesis. Vermiculite and montmorillonite proceed from the degradation of these micaceous structures. But it may be assumed also that these clay minerals could be new-formed from elements which were released during the hydrolysis of feldspars.Keywords
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