Fig. 5: δ18O-Mg#-Ni-Mn-Zn covariation diagrams for olivine grains.

Covariation diagrams of δ18O versus a Mg#, b Ni (ppm), c Mn (ppm), and d Zn (ppm) for olivine in the examined southern African kimberlites. Two dashed outlines show olivine compositions from two Kimberley polymict breccia xenoliths (i.e., failed kimberlite magmas at mantle depths)48. Green bands represent the mantle olivine value (5.18 ± 0.28‰; see ref. 3). Error bars indicate the 2σ of each analysis.