Table 1
Key data for cooling history of selected H chondrites.
| Meteorite | Estacado | Guareña | Kernouvé | Richard- | Allegan | Nadiabondi | Forest Vale | Ste. Mar- | |
| ton | guerite | ||||||||
|
|
|||||||||
| type | H6 | H6 | H6 | H5 | H5 | H5 | H4 | H4 | |
| Hf-Wf (metal-silicate) | |||||||||
| radiometric age | 4557.3 ± 1.6 | 4557.9 ± 1.0 | 4561.6 ± 0.8 | 4565.6 ± 0.6 | Ma | ||||
| temperature | 1150 ± 75 | 1150 ± 75 | 1100 ± 75 | 1070 ± 50 | K | ||||
| Pb-Pbg (pyroxene-olivine) | |||||||||
| radiometric age | 4537.0 ± 1.1 | 4558.9 ± 2.3 | 4564.3 ± 0.8 | Ma | |||||
| temperature | 1050 ± 100 | 1050 ± 100 | 1050 ± 100 | K | |||||
| U-Pb-Pbe (phosphates) | |||||||||
| radiometric age | 4559 ± 2 | 4504.4 ± 0.5 | 4522.5 ± 2.0 | 4551.4 ± 0.6 | 4550.2 ± 0.7 | 4555.6 ± 3.4 | 4560.9 ± 0.7 | 4562.7 ± 0.6 | Ma |
| temperaturea | 720 ± 50 | 720 ± 50 | 720 ± 50 | 720 ± 50 | 720 ± 50 | 720 ± 50 | 720 ± 50 | 720 ± 50 | K |
| Ar-Areh (feldspar) | |||||||||
| radiometric age | 4465 ± 5 | 4458 ± 10 | 4499 ± 6 | 4525 ± 11 | 4541 ± 11 | 4535 ± 10 | 4552 ± 8 | 4562 ± 16 | Ma |
| temperatureb | 550 ± 20 | 550 ± 20 | 550 ± 20 | 550 ± 20 | 550 ± 20 | 550 ± 20 | 550 ± 20 | 550 ± 20 | K |
| Pu-fission tracks (pyroxene) | |||||||||
| calculated agec | 4465 ± 5 | 4458 ± 10 | 4499 ± 6 | 4525 ± 11 | 4541 ± 11 | 4535 ± 10 | 4552 ± 8 | 4562 ± 16 | Ma |
| temperature | 550 ± 25 | 550 ± 25 | 550 ± 25 | 550 ± 25 | 550 ± 25 | 550 ± 25 | 550 ± 25 | 550 ± 25 | K |
| Pu-fission tracks (merrilite) | |||||||||
| calculated agec | 4401 ± 10 | 4402 ± 14 | 4438 ± 10 | 4469 ± 14 | 4490 ± 14 | 4543 ± 20 | 4544 ± 14 | 4550 ± 17 | Ma |
| temperature | 390 ± 25 | 390 ± 25 | 390 ± 25 | 390 ± 25 | 390 ± 25 | 390 ± 25 | 390 ± 25 | 390 ± 25 | K |
| Pu-fission tracks (pyroxene – merrillite) | |||||||||
| time intervalde | 64 ± 9 | 56 ± 9 | 61 ± 8 | 56 ± 9 | 51 ± 9 | >−8 | <8 | 12 ± 11 | Ma |
| cooling rate | 2.5 ± 0.4 | 2.8 ± 0.6 | 2.6 ± 0.5 | 2.9 ± 0.5 | 3.2 ± 0.6 | (fast) | >20 | 12.8 ± 6 | K/Ma |
Notes.
Calculated age at 390 K from time interval between Pu-fission track (merillite, 390 K) and Pu-fission tracks at 550 K (pyroxene) compared to Ar-Ar feldspar age at 550 K.
Time-interval for Pu-fission track cooling rate from 550–390 K, metallographic cooling rate 800–600 K.
Data from U-Pb-Pb: Göpel et al. (1994), Ar-Ar: Trieloff et al. (2003), metallographic cooling rates: Taylor et al. (1987).
Hf-W ages are from Kleine et al. (2008) and were re-calculated relative to the 182Hf/180Hf of the angrite D’Orbigny, which has a Pb-Pb age of t = 4563.4 ± 0.3 Ma (Kleine et al. 2012).
Recalculated for miscalibration of K decay constant (explanation see text and Trieloff et al. 2003).
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