Figure 3.

The effect of lunar core formation on the Hf/W ratio of the silicate Moon. The models assume different metal–silicate partition coefficients for W ($D_W^{core/mantle}$ between 15–100), and different lunar core mass fractions (1.5–3%). The initial Hf/W of the Bulk Moon is the same as that of the Bulk Silicate Earth. The lunar Hf/W ratio value is reached with $D_W^{core/mantle}$ values between 30 and 60, and core mass fractions between 1 to 3% of the mass of the Moon. The two estimates of the BSE Hf/W encompass a historical value (ref. ⁴⁹) and a revised value based on high precision measurements of Ta and W (ref. ²³)