Calcium carbonate accumulation in deep strata and calcrete in Quaternary alluvial formations of Morocco

Morphological studies on various scales of calcium carbonate accumulation which cements the Quaternary alluvial formations of the Sebou and the Moulouya (Morocco), show that there are two types of accumulation. The first, a thin layer always found near the surface, appears to be derived from the loc...

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Bibliographic Details
Published in:Geoderma 1991, Vol.48 (1), p.43-57
Main Authors: Kaemmerer, Michel, Revel, Jean Claude
Format: Article
Language:English
Subjects:
Biodiversity and Ecology
Ecology, environment
Ecosystems
Environmental Sciences
Life Sciences
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Summary:Morphological studies on various scales of calcium carbonate accumulation which cements the Quaternary alluvial formations of the Sebou and the Moulouya (Morocco), show that there are two types of accumulation. The first, a thin layer always found near the surface, appears to be derived from the local redistribution of calcium carbonate under the influence of pedogenetical phenomena. The second, found in deeper strata, is a homogeneous thicker layer. It develops below the water table, after a long displacement of calcium carbonate in solution. These cemented layers affect the evolution of landscapes. Létude morphologique, à différentes échelles, des accumulations calcaires, qui consolident les alluvions quaternaires du Sébou et de la Moulouya (Maroc), montrent qu'il existe en fait deux types d'accumulation. L'une, toujours proche de la surface, peu éspaisse (calcrète) parait provenir de la redistribution locale du calcaire sous l'influence de phénomènes pédogénétiques. L'autre, profonde, très épaisse (encroûtement de nappe) est homogène; elle proviendrait de l'accumulation du calcaire dans la nappe phréatique après un long déplacement du calcium en solution. L'induration des alluvions marque l'évolution des bassins et des paysages.
ISSN:0016-7061
1872-6259
DOI:10.1016/0016-7061(91)90005-E