illuviation

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Related to illuviated: zone of illuviation

illuviation

[i‚lü·vē′ā·shən]
(geology)
The deposition of colloids, soluble salts, and small mineral particles in an underlying layer of soil.
References in periodicals archive ?
Inceptisols are immature soils of humid and subhumid regions that have altered horizons with evidence of chemical and physical change, but still have some weatherable material and lack a clear illuviated zone (Figure 3-12).
It is suggested that the flooded conditions at the time may have raised levels of dissolved organic carbon in surface soil from illuviated humus sources in the subsoils of these podzols.
Below this, there is a Bh horizon (79-102 in [200-260 cm] thick) that is dark brown to black and the result of the accumulation of illuviated organic matter, which covers the sand grains and may cement them together.
It is possible that smectite was deposited on the dunes as a minor constituent of aeolian dust, which subsequently disaggregated, and because of the generally very small size of smectite particles (Pye and Sherwin 1999) these were preferentially illuviated from the upper phases of the dunes.
Micromorphological features described here strongly support the presence of an aeolian dust component, with a likely scenario being that the clay material was deposited, disaggregated, or removed from larger grains, and subsequently illuviated lower down the profile.
In other cases, after the washing of the carbonates, the clay may have been illuviated to form an argillic horizon--one of considerable thickness but containing only a little clay.
It indicated that illuviated iron was not the main resource of iron oxides in iron nodules, Free Fe-oxide ([Fe.
Based on clay minerals and radiocarbon analysis, we suggest that the major driving force promoting the formation of iron nodules was in situ weathering from saprolite by frequent alternating wetting/drying cycles, whereas illuviated iron played only a minor role in this formation.
As a result, the particles in the surface horizon are dispersed and illuviated deeper into the soil, a process favored in spring by the reversal of the thermal gradient.
The purpose of this investigation was to study this process according to land use and to compute the amount of organic carbon in the subsoil as a consequence of illuviated ped coating in the subsoil.
The result is the formation of horizons of accumulated illuviated clays which are called argillic endopedons.