Concentrations | Measured Ratios | Calculated Ratios | Apparent Ages in Ma | |||||||||
U ppm | Pb ges. | Pb. rad | Pbcom | 206Pb/204Pb | 207Pb/206Pb | 208Pb/206Pb | 206Pb/238U | 207Pb/235U | 207Pb/206Pb | 206Pb/238U | 207Pb/235U | 207Pb/206Pb |
256 | 21.6 | 21.6 | 0 | 5051 | 0.077404 | 0.075546 | 0.085929 | 0.884963 | 0.074694 | 531 | 644 | 1060 |
246 | 23.2 | 23.2 | 0.06 | 7668 | 0.085612 | 0.073304 | 0.094876 | 1.097510 | 0.083897 | 584 | 752 | 1290 |
330 | 29.3 | 29.2 | 0.11 | 6609 | 0.076191 | 0.098515 | 0.088057 | 0.900312 | 0.074153 | 544 | 652 | 1046 |
506 | 41.6 | 41.6 | 0.02 | 9882 | 0.076612 | 0.067118 | 0.084049 | 0.872321 | 0.075274 | 520 | 637 | 1076 |
1051 | 83.8 | 83.3 | 0.48 | 5522 | 0.073429 | 0.059606 | 0.081942 | 0.801749 | 0.070963 | 508 | 598 | 956 |
2587 | 214.0 | 187.9 | 26.14 | 428 | 0.098646 | 0.124873 | 0.075973 | 0.689793 | 0.065850 | 472 | 533 | 802 |