Figure 2
X-ray diffraction patterns for the three samples C1, C2 and C3 (a, b and c) in air-dried (AD) and after ethylene glycol solvatation (EG). Figure 2d compares the coarse fraction of the three samples.
Figure 3
Ternary diagram for clay mineral particles <2 µm for all samples (a). The theoretical compositions for biotite, nontronite, kaolinite and vermiculite have also been plotted. (b) - Ternary diagram of <0.05 µm size fraction for all samples. Their composition is close to a Fe-rich dioctahedral smectite (Petit et al., 1992).
