STUDY OF SOME SMECTITES DERIVED BY WEATHERING OF CRYSTALLINE ROCKS OF THE PROVENCE REGION (SE FRANCE) INFLUENCE OF THE PARENT ROCK ON THEIR CHEMICAL COMPOSITION

Rok, strany: 1994, 77 - 84

The saprolites from igneous rocks of the Provence basement (SE France) are poor in < 2 µm fraction (1–5 %). Clay minerals consist of smectites, illite, kaolinite, metahalloysite, some vermiculite and an appreciable proportion of interstratified clays (20–30 %). In this paper, we will study especially the smectites which are composed of two groups: the first one derived from granite, diorite and basalt, is a montmorillonite type, without tetrahedral substitution and whous sum of octahedral cations varies from 2.0 to 2.2. The second group, derived from trachydolerite, is intermediate with tetrahedral substitution, like in beidellites. The cationic octahedral content is 2.5. The chemical composition of both groups shows a clear influence of the parent rock. The different smectites of this area were influenced by the ferromagnesia and aluminomagnesian minerals present in the parent rocks.

ISO 690:

Chevalier, Y., Bech Borras, J., Dejou, J. 1994. STUDY OF SOME SMECTITES DERIVED BY WEATHERING OF CRYSTALLINE ROCKS OF THE PROVENCE REGION (SE FRANCE) INFLUENCE OF THE PARENT ROCK ON THEIR CHEMICAL COMPOSITION. In Geologica Carpathica Clays, vol. 3, no.2, pp. 77-84.

APA:

Chevalier, Y., Bech Borras, J., Dejou, J. (1994). STUDY OF SOME SMECTITES DERIVED BY WEATHERING OF CRYSTALLINE ROCKS OF THE PROVENCE REGION (SE FRANCE) INFLUENCE OF THE PARENT ROCK ON THEIR CHEMICAL COMPOSITION. Geologica Carpathica Clays, 3(2), 77-84.