Geochronological and geochemical constraints on the formation and evolution of the mantle underneath the Kaapvaal craton: Lu-Hf and Sm-Nd systematics of subcalcic garnets from highly depleted peridotites

Subcalcic garnets carry the major inventory of most trace elements of their host harzburgites and are thus proxies of the bulk composition. We used single garnet grains from heavy mineral concentrates from the Kaapvaal craton (Roberts Victor and Lace mine) to determine the major and trace elements and the Sm–Nd and Lu–Hf isotope systematics of these highly depleted members of the peridotitic suite. The combination of the results with previous work from the Finsch mine (Lazarov et al., 2009a) allowed us to reconstruct the formation and evolution of the mantle underneath the Kaapvaal craton.