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. Author manuscript; available in PMC: 2024 Dec 8.
Published in final edited form as: Nat Geosci. 2019 Jul 29;12(9):696–700. doi: 10.1038/s41561-019-0398-3

Figure 2.

Figure 2

Scenarios accounting for the higher Hf/W of the BSM. (a) A late veneer of chondritic material (Hf/W ratio~1) lowers BSE Hf/W from ca. 30-50 to 25.6 after 182Hf extinction, while the Moon preserves its original Hf/W. (b) The Moon forming event takes place while Earth’s core is still forming and 182Hf is extant. Increasingly oxidised conditions later lower BSE Hf/W. (c) Formation of a small lunar core scavenged W from the BSM, increasing its Hf/W. In models (b) and (c), formation of the Moon must have occurred during the lifetime of 182Hf, i.e., within 60 Myrs after solar system formation.