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. 2022 Nov 16;8(46):eabp8415. doi: 10.1126/sciadv.abp8415

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Fig. 4. — The time evolution of the μ⁵³Cr ingrowth, which represents the difference between the mantle and crustal reservoirs with modeled ⁵⁵Mn/⁵²Cr ratios of 0.724 ± 0.12 and 1.22 ± 0.27, respectively (see main text). We use a value of 0.769 ± 0.136 for the bulk ⁵⁵Mn/⁵²Cr ratio of Mars (33) and an initial solar system ⁵³Mn/⁵⁵Mn of 6.77 × 10⁻⁶ (71). The blue band reflects the range of μ⁵³Cr compositions considering the model uncertainty. The measured μ⁵³Cr excess of 14.1 ± 2.3 ppm represents the difference between the inferred mantle (ALHA 77005) and crustal (weighted mean of MIL 03346, MIL 090032, and NWA 7320) endmember compositions.