It consists of the destruction of the features of illuviation formerly considered (mainly coatings). The illuvial clay accumulations do not remain undisturbed in the soil and the causes of their modification are many.
In clay soils, the changes in humidity cause expansions and contractions which severely deform the illuvial accumulations.
On other occasions, it is the neoformation of pedological compounds, as in the case of carbonate precipitation, that causes the fragmentation and disorganisation of the clay coatings.
The biotic activity is also an important cause of perturbation.
Finally, cryoclastia can affect the conservation of illuvial accumulations in cold climates.
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