| Variable | PC1 | PC2 |
| 206Pb/204Pb | 0.440 | −0.152 |
| 207Pb/204Pb | 0.445 | −0.104 |
| 208Pb/204Pb | 0.212 | 0.480 |
| 206Pb/207Pb | 0.441 | −0.141 |
| 208Pb/206Pb | −0.416 | 0.230 |
| 208Pb/207Pb | −0.002 | 0.567 |
| U | 0.274 | −0.104 |
| Th | 0.243 | 0.413 |
| Pb | 0.247 | 0.401 |
| Eigenvalue | 4.6145 | 2.6974 |
| Proportion | 0.513 | 0.300 |
| Cumulative | 0.513 | 0.812 |