Table 8
Summary of model calculations for the thermal evolution of the L chondrite parent body.
| Mi81 | Be95 | Be96 | BA02 | Bo07 | Sp11 | Ma14 | Bl18 | LM2 | Units | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| por. | comp. | ||||||||||
| Method (a) | Ana | Ana | Ana | Num | Num | Ana | Num | Ana | Num | ||
| Heat source | 26Al | 26Al | 26Al | 26Al | 26Al, 60Fe | 26Al | 26Al, 60Fe | 26Al, 40K, … | |||
| Input parameter | |||||||||||
| Intrinsic density ϱi | 3 610 | 3 610 | 3650 | 3610 | – | 3610 | – | 3510 | 3580 | kg m−3 | |
| Bulk density ϱb | 3200 | 3610 | 3290 | 3520 | – | 3200 | 3400 | 3350 | var | kg m−3 | |
| Porosity Φ0 | 11.3 | 0 | 10.3 | 2.5 | – | 11.3 | 3.0 | 4.6 | var | % | |
| Heat conductivity core K | 1.0 | 1.98 | 0.90 | 2.35 | var | 1.0 | 4.0 | 4.0 | var | W m−1K−1 | |
| — mantle | var | 1.0 | var | W m−1K−1 | |||||||
| Heat capacity cp | 625 | 720 | 730 | 760 | var | 625 | 872 | 930 | var | J kg−1K−1 | |
| 26Al/27Al ratio (b) | 5 × 10−5 | 5 × 10−5 | 5 × 10−5 | 5 × 10−5 | 5 × 10−5 | 5 × 10−5 | 5 × 10−5 | 5 × 10−5 | 5.25 × 10−5 | ||
| Heating rate (c) | 1.82 × 10−7 | 1.97 × 10−7 | 1.97 × 10−7 | 1.97 × 10−7 | 1.97 × 10−7 | 1.82 × 10−7 | 2.52 × 10−7 | 3.37 × 10−7 | 1.65 × 10−7 | W kg−1 | |
| Initial and boundary condition | |||||||||||
| Initial temperature T0 | 180 | 180 | 300 | 300 | 200 | 300 | 180 | 250 | 200 | K | |
| Boundary temperature Tb | 180 | 180 | 300 | 300 | 200 | 300 | 180 | 250 | 200 | K | |
| Parent body parameter | |||||||||||
| Radius R | 85 | 60 | 54 | 90 | 100 | 100 | 100 | 100 | >240 | 115 | km |
| Birth time tb | 2.5 | ~2 | 1.6 | 2.0 | 2.3 | 2–4 | 2.7 | 2.22 | 2.05–2.25 | 1.89 | Ma |
| Central temperature | 1 150 | 1 273 | 1 273 | 1 273 | ~ 1 230 | ~ 1 700 | 1 170 | 1 273 | 1 173 | 1 186 | K |
| Reference | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | ||
Notes. (a) Ana: Analytic solution of the heat conduction equation, material properties constant. Num: Numerical solution of the heat conduction equation, material properties temperature dependent. (b) At time of solar system formation. (c)By decay of 26Al at time of solar system (CAI) formation. In models Mi81, Be95, Be96, and Sp11 the heating rate by 26Al is determined from the expression given in Herndon & Herndon (1977), in model Bl18 the heating rate is from Castillo-Rogez et al. (2009), and in the present paper it is calculated as described in Henke et al. (2012a).
References.(1) Miyamoto et al. (1981); (2) Bennett & McSween (1995); (3) Bennett & McSween (1996); (4) Benoit et al. (2002) ; (5) Bouvier et al. (2007); (6) Sprung et al. (2011); (7) Mare et al. (2014); (8) Blackburn et al. (2017); (9) this work.
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