Yn. Vodyanitskii et al., The effect of gleyzation on iron compounds in red-colored deposits (experimental results), EURAS SOIL, 33(4), 2000, pp. 370-375
Red-colored deposits occurring in the northwest and east of the Russian Pla
in lose their red color upon gleyzation under a stagnant water regime eithe
r because of dissolution of hematite particles or because of their dispersi
on and separation from the clay mineral surfaces. In clayey deposits with i
ron minerals presented mainly by fine crystals, processes induce the dissol
ution of hematite and goethite. Tn sandy deposits, gleyzation contributes t
o the dispersion of relatively coarse hematite grains in clay fraction and
their separation from the clay mineral surfaces. Gley is more advanced in d
eposits with a higher degree of iron oxidogenesis, expressed as the Fe-d/Fe
-t ratio.