Abstract
Gypsum is the most abundant mineral in the soils of arid regions, it forms when the concentrations of Ca+2 and SO4-2 are considerable in the soil and has an enormous influence on their physico-chemical properties. Several representative profiles on a sequence in the Ziban region (northeast of Algeria) were studied. The results obtained indicate that several forms of gypsum are distributed according to the physico-chemical characteristics of the soils. The formation of gypsum is geological in the upper levels and of neoformation in the lower part of the plain towards the depression of Oumach this is due to the proximity of the water table.
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