Table 6
Key data for cooling history of selected H chondrites.
| Quantity | Kernouvé | Richardton | |
|
|
|||
| type | H6 | H5 | |
| Hf-W3 (metal-silicate) | |||
| radiometric age | 4559 ± 1 | 4563 ± 1 | Ma |
| temperature | 1150 ± 75 | 1100 ± 75 | K |
| U-Pb-Pb3 (phosphates) | |||
| radiometric age | 4522 ± 1 | 4551 ± 1 | Ma |
| temperature | 720 ± 50 | 720 ± 50 | K |
| Ar-Ar23 (feldspar) | |||
| radiometric age | 4499 ± 6 | 4525 ± 11 | Ma |
| temperature | 550 ± 20 | 550 ± 20 | K |
| Pu-fission tracks (pyroxene-merrilite) | |||
| calculated age4 | 4499 ± 6 | 4525 ± 11 | Ma |
| cooling rate | 2.6 ± 0.5 | 2.9 ± 0.5 | K/Ma |
| calculated age4 | 4438 ± 10 | 4469 ± 14 | Ma |
| time interval13 | 61 ± 8 | 56 ± 9 | Ma |
| metallographic | |||
| cooling rate13 | 10 | 20 | K/Ma |
Notes.
Time-interval for Pu-fission track cooling rate from 550 − 390 K, metallographic cooling rate 800–600 K.
Recalculated for miscalibration of K decay constant (explanation see text and Trieloff et al. 2003).
Data from Hf-W: Kleine et al. (2008), U-Pb-Pb: (Göpel et al. 1994), Ar-Ar: Trieloff et al. (2003), metallographic cooling rates: Taylor et al. (1987).
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