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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 1.

Figure 1

New U/W vs. Hf/W data measured in lunar samples compared to crystallization and melting models for the LMO34. Errors are less than symbol sizes. Measured lunar highland breccia compositions straddle mixing lines between a KREEP-enriched end-member30 and FAN compositions as determined in this study. Contamination with W-rich meteoritic components produces virtually identical trajectories and raises absolute W content. The high-Ti mare basalt source mineral assemblage is defined by a mixture of LMO cumulates matching Apollo 17 mare basalt Hf and Nd isotope systematics12,27,30–32,34. Note the overall excess of Hf/W in lunar basalts compared to recent BSE estimates23.