Table 9
Parameters for optimised models of the parent body of H chondrites using different approaches for calculating the heat conductivity of the porous material.
| Model G | Model Y | Model H | |||
|
|
|||||
| Quantity | Symbol | Value | Value | Value | Unit |
|
|
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| Parameters | |||||
| Heat conductivity | Kb | 4.9 | 4.9 | 4.0 | W (mK)-1 |
| Optimised parent body | |||||
| Radius | Rp | 154.7 | 168.9 | 159.4 | km |
| Formation time | tform | 1.940 | 1.879 | 1.840 | Ma |
| Surface temperature | Tsrf | 240.8 | 167.2 | 159.0 | K |
| Max. central temperature | Tc | 1 215 | 1 240 | 1 276 | K |
| Residual porous layer | 8.5 | 2.5 | 2.09 | km | |
|
|
|||||
| Fit quality | χ2/ (N−p) | 0.65 | 0.73 | 0.79 | |
|
|
|||||
| Meteorite | type | Burial depth and maximum temperature Tmax | |||
| kmK | kmK | kmK | |||
|
|
|||||
| Estacado | H6 | 60.0 1191 | 46.6 1202 | 40.4 1235 | |
| Guareña | H6 | 57.6 1190 | 43.9 1201 | 38.8 1234 | |
| Kernouvé | H6 | 42.2 1180 | 29.9 1186 | 27.1 1217 | |
| Mt. Browne | H6 | 31.1 1159 | 20.0 1153 | 18.2 1182 | |
| Richardton | H5 | 20.4 1101 | 10.7 1079 | 10.2 1100 | |
| Allegan | H5 | 19.4 1096 | 9.60 1059 | 9.01 1080 | |
| Nadiabondi | H5 | 16.4 1057 | 5.46 981 | 7.56 1051 | |
| Forest Vale | H4 | 7.36 851 | 1.53 758 | 1.73 766 | |
| Ste. Marguerite | H4 | 5.67 754 | 1.30 674 | 1.69 751 | |
Notes. Model G uses the heat conductivity for a granular chondritic material as we derived. Model Y uses the porosity dependence of K as found for impact fractured material. For comparison, model H shows the result from model H of Gail et al. (2015).
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