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Fig. S1. OS-1. This figure is identical to Fig. 20, except here the axes have been reformatted to log-log scaling, which results in near-linear curves for each set of (fixed diffusivity and θ) results. However, decay of the heat source (26Al) causes the curves to deviate from parallel-linearity toward the low-t end of the diagram. Curves are shown for seven different possible values of θ, i.e,, (TbaseTsurface)/(T deepTsurface); and for three different values of thermal diffusivity κ. To a fair approximation, κ ~ 10−6 (m2 s−1) corresponds to a skin that consists of solid rock, 10−7 corresponds to a skin of porous-rocky megaregolith, and 10−8 to a skin of powdery regolith (sensu stricto).

Fig. S2. OS-2. This figure is analogous to Fig. 20, except here post-t0 heating (by 26Al) is ignored, and consequently the zskin results are slightly greater. Curves are shown for seven different possible values of θ, i.e,, (TbaseTsurface)/(T deepTsurface); and for three different values of thermal diffusivity κ. To a fair approximation, κ ~ 10−6 (m2 s−1) corresponds to a skin that consists of solid rock, 10−7 corresponds to a skin of porous-rocky megaregolith, and 10−8 to a skin of powdery regolith (sensu stricto).

Fig. S3. OS-3. This figure is identical to Fig. OS-2, except here the axes have been reformatted to log-log scaling, which results in linear curves for each set of (fixed diffusivity and θ) results. Curves are shown for seven different possible values of θ, i.e,, (TbaseTsurface)/(T deepTsurface); and for three different values of thermal diffusivity κ. To a fair approximation, κ ~ 10−6 (m2 s−1) corresponds to a skin that consists of solid rock, 10−7 corresponds to a skin of porous-rocky megaregolith, and 10−8 to a skin of powdery regolith (sensu stricto).

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