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Table 5
Cooling ages and closure temperatures of H-chondrites used in this study.
| Meteorite | Type | Hf-W | Pb-Pb | Al-Mg | U-Pb-Pb | Ar-Ar | Pu-fission tracks | |
| (metal- | (pyroxene | (feldspar) | (phosphates) | (feldspar) | (merrillite) | |||
| silicate) | olivine) | |||||||
| closure | 1150 ± 75 | 1050 ± 100 | 750 ± 130 | 720 ± 50 | 550 ± 20 | 390 ± 25 | K | |
| temperature | (1100 ± 75 | |||||||
| for Richardton) | ||||||||
|
|
||||||||
| Estacado | H6 | 4557.2 ± 1.6 | 4526.6 ± 6.3 | 4491 ± 8 | 4463 ± 5 | 4399 ± 10 | Ma | |
| Guareña | H6 | 4504.4 ± 0.5 | 4456 ± 10 | 4400 ± 14 | Ma | |||
| Kernouvé | H6 | 4557.9 ± 1.0 | 4536.0 ± 1.1 | 4522.5 ± 2.0 | 4497 ± 6 | 4436 ± 10 | Ma | |
| Mt. Browne | H6 | 4553.8 ± 6.3 | 4543 ± 27 | 4514 ± 5 | 4469 ± 13 | Ma | ||
| Richardton | H5 | 4561.6 ± 0.8 | 4561.7 ± 1.7 | 4551.4 ± 0.6 | 4523 ± 11 | 4467 ± 14 | Ma | |
| Allegan | H5 | 4550.2 ± 0.7 | 4539 ± 11 | 4488 ± 14 | Ma | |||
| Nadiabondi | H5 | 4557.9 ± 2.3 | 4555.6 ± 3.4 | 4533 ± 10 | 4541 ± 20 | Ma | ||
| Forest Vale | H4 | 4561.3 ± 0.2 | 4560.9 ± 0.7 | 4550 ± 8 | 4542 ± 14 | Ma | ||
| Ste. Marguerite | H4 | 4561.9 ± 0.2 | 4562.7 ± 0.6 | 4560 ± 16 | 4548 ± 17 | Ma | ||
Notes. For sources of data see text; errors are 1σ.
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