Fig. 3.11 The solubility of aluminium and Silicon as a function of pH. In the shaded area aluminium is morę solublc than Silicon and may be preferentially removed from s weathering profile.
illite
Mica
Mi ye^1 icy^r clays
raldspars Fo-Mg srhates
** Smectites-— * K^oiinite
♦ Gibbsite
Time_ »
Fig. 3.18 The production of clay ninerals by weathering as a function of leachir.; int*ns!.y.