Table 5 Geochemical (ICP-OES) composition of the sandstones.
From: Petrophysical and mechanical characterization of sandstones from different grottoes in China
Yungang sandstone | Tianlongshan sandstone | Leshan sandstone | Dazu sandstone | |
|---|---|---|---|---|
SiO2 | 79.98 | 88.26 | 73.37 | 75.13 |
Al2O3 | 12.15 | 6.80 | 10.47 | 8.92 |
Fe2O3 | 2.19 | 2.07 | 2.76 | 2.65 |
TiO2 | 0.28 | 0.16 | 0.52 | 0.47 |
MnO | 0.22 | 0.28 | 1.24 | 1.22 |
MgO | 0.07 | 0.05 | 0.08 | 0.05 |
CaO | 3.01 | 0.37 | 7.21 | 8.26 |
Na2O | 0.22 | 1.15 | 2.56 | 1.58 |
K2O | 1.82 | 0.83 | 1.68 | 1.63 |
P2O5 | 0.07 | 0.03 | 0.11 | 0.09 |
K2O/Na2O | 8.32 | 0.72 | 0.66 | 1.04 |
SiO2/Al2O3 | 6.58 | 12.98 | 7.01 | 8.42 |
CIA | 56.92 | 62.36 | 33.87 | 30.17 |
CIW | 67.59 | 72.51 | 37.66 | 33.60 |
