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(Article of periodic en Français - 1979)

Document title

Les vertisols des îles Canaries occidentales. Etude physico-chimique, minéralogique et micromorphologique

Abstract

Vertic matrix originates from basalt or lapillis. Illuviation of swelling clay in cracks of the weakly weathered basalt or between the glass grains breaks the basalt or presses the glass. Next basalt fragments are dispersed in the vertic matrix where they are slowly smashed, weathering being parallel to this smashing, or already deformed glass grains are integrated with pressure into the matrix. Colluviation is very strong in these vertisols and masks the origin of the matrix in most soils. Swelling and drying leads to translocation of soil material in the cracks from the top soil to the lower (B), to strong compaction and orientation of clay minerals and to "grinding" of coarse grains and fragments. Clay illuviation is important in all these soils| argillans are common in the top soil and the weathering zone| in the (B) horizons they are probably destroyed by swelling. In the driest zones of these islands the vertisols are invaded by calcium carbonate.

Source

Article of periodic

published at : Pédologie. Bulletin de la Société belge de pédologie Gand/Gent

Editor :

Millesime : 1979, vol. 29, no1 [pp. 71-107]

Bibliographic references : 44 réf.

Language

Français

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