| Variable | PC1 | PC2 |
| 206Pb/204Pb | 0.503 | −0.016 |
| 207Pb/204Pb | 0.488 | 0.026 |
| 208Pb/204Pb | 0.161 | 0.678 |
| 206Pb/207Pb | 0.504 | −0.003 |
| 208Pb/206Pb | −0.477 | 0.176 |
| 208Pb/207Pb | −0.040 | 0.713 |
| Eigenvalue | 3.9180 | 1.9517 |
| Proportion | 0.653 | 0.325 |
| Cumulative | 0.653 | 0.978 |