Table 4 Results of PCA, showing contribution of PC1–4 to overall variability, and contribution of individual variables to each PC
Variable | PC1 (46%) | PC2 (21%) | PC3 (11%) | PC4 (10%) |
|---|---|---|---|---|
Quartz | 9.9 | 23.4 | 4.7 | 3.1 |
Opal CT | 5.8 | 1 | 33.6 | 28. |
Calcite | 14.5 | 6.5 | 14.1 | 4.9 |
Clays | 2.2 | 33 | 7.2 | 1.7 |
Bulk density | 7.1 | 2.7 | 25.6 | 23 |
Open porosity | 7.2 | 16 | 5.8 | 0.9 |
Pulse velocity | 24.5 | 1.4 | 0 | 5.6 |
Capillary absorption | 19.4 | 2.4 | 2.3 | 7.3 |
Sorptivity | 9.4 | 13.7 | 6.7 | 25.1 |