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Kimberlites are rare, hybrid igneous rocks consisting of primary magmatic components, and mantle and crustal-derived xenoliths. During ascent, kimberlite magmas transport, assimilate and metasomatise material along the magma conduit. The combination of these processes contributes to generate the peculiar hybrid character of kimberlites (e.g., Giuliani et al. 2016). The degree to which assimilation influences kimberlite melts has been difficult to constrain from the composition of magmatic minerals alone. Olivine is the most abundant phase in kimberlites and, therefore, its composition can provide valuable information about the evolution of kimberlite magmas. In kimberlites, olivine is typically zoned with a mantle-derived, xenocrystic core, and an overgrowth (rim) that crystallises from the kimberlite melt (e.g., Brett et al. 2009; Pilbeam et al. 2013).

Complex zoning of olivine in archetypal kimberlites provides new insights into the evolution of kimberlite magmas