illuvial horizon

illuvial horizon

[i′lü·vē·əl hə′rīz·ən]
(geology)
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The sequence of soil horizons in the first soil profile (lysimeter 1) was as follows: (i) a top layer (litter) ~13 cm thick (horizon A); (ii) a 37-cm-thick illuvial horizon with anthropogenie disturbances, consisting of two sub-horizons, a light layer on top of a black organic-rich one (horizon B1 and horizon B0, respectively); and (iii) the parent material with two sub-horizons, a white-coloured on top of a green-coloured sub-horizon starting at a depth of 88 cm (horizon Cw and horizon Cg, respectively).
1]) for the third layer, which corresponds to the bottom sub-layer of the illuvial horizon (black organic-rich layer).
An argillic horizon is an illuvial horizon that is at least 10 percent as thick as the overlying A horizon and contains 3 to 8 percent more clay.
A micromorphological comparison of the horizons (Reuter 1964b) proved that the obvious polygenesis can certainly not be a transformation of BrownEarth into Lessive as some other authors have assumed: in the argillic illuvial horizon the clay and silt particles are 90% strongly dispersed.
The interval from 66-112 cm is also now part of the BC horizon of the surface soil and an illuvial horizon (B'X) of the fragipan.
This process consists in the translocation of claysize particles from eluvial (A, E) to illuvial horizons (mainly Bt, and to a lesser degree, in BA or BC horizons).