Figure 2.

Plot of δ⁵⁶Fe and δ⁵⁷Fe values of Martian meteorites and terrestrial samples analysed in the present study. This is an expanded version of the data presented in figure 1 which is bounded by the shaded rectangle. The error bars on each data point represent two standard deviations in Fe-isotopic measurements. Almost all samples analysed in the present study show limited fractionation in Fe isotopes. The terrestrial granites and a sandstone sample from Antarctica show slightly heavier Fe-isotopic signature but the values are well within the range of fractionation reported for terrestrial rocks from abiological systems.