| Variable | PC1 | PC2 |
| 206Pb/204Pb | 0.499 | 0.003 |
| 207Pb/204Pb | 0.485 | 0.000 |
| 208Pb/204Pb | 0.150 | 0.693 |
| 206Pb/207Pb | 0.499 | 0.019 |
| 208Pb/206Pb | −0.485 | 0.099 |
| 208Pb/207Pb | −0.094 | 0.714 |
| Eigenvalue | 3.9889 | 1.8926 |
| Proportion | 0.665 | 0.315 |
| Cumulative | 0.665 | 0.980 |