Fig. 2: Angrites deviate from the trend of increasing δ41K with enhanced volatile depletion defined by other planetary basalts.

The blue arrows illustrate the direction of increasing volatile loss indicated by a smaller planetary size and b elevated Mn/Na ratio. The δ41K values of differentiated terrestrial bodies are from the literature, including Earth (refs. 24, 25, 66), Mars (refs. 12, 27, 34), the Moon (refs. 11, 33), and Vesta (refs. 27, 34). The Mn/Na ratios of CI chondrites, Earth, and Mars are from refs. 45, 67, and 4, respectively, and those of the Moon, Vesta, and angrites are from ref. 7. The colored horizontal bars represent average δ41K values. For lunar rocks, filled symbols are mare basalts, and open symbols are non-mare rocks. δ41K error bars are plotted as 95% c.i. When not seen, they are smaller than the sample symbols.