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The Archean Kaapvaal Craton of southern Africa is bounded to the west and south by two Proterozoic terranes (Fig. 1): the Rehoboth Province (RP) and Namaqua-Natal Province (NNP). Mineral major and trace element data were obtained for garnet bearing peridotite xenoliths exhumed from four Late Cretaceous Group 1 kimberlites (71-83 Ma; Davis et al., 1976; Davies et al., 2001; Griffin et al., 2014) located near the RP-NNP border. These are Rietfontein and Louwrensia (one of the Gibeon cluster kimberlite pipes) in the southern RP, and Hoedkop and Pofadder in the northwestern NNP (Figure 1). Forty-four peridotite xenoliths were investigated from these four localities in order to compare the thermal and metasomatic characteristics of the mantle lithosphere beneath these terranes with each other and with the Kaapvaal Craton. Major element mineral data have been published for peridotites from the Louwrensia and Hoedkop localities (Boyd et al., 2004; Janney et al., 2010), but not for those from Rietfontein or Pofadder. New clinopyroxene and garnet trace element data were obtained for all samples by laser ablation ICP-MS at UCT. For both major and trace element data, there were no significant compositional differences observed between cores and rims of the grains analysed.

Contrasting thermal structure, melt depletion and metasomatism of mantle lithosphere beneath two Proterozoic terranes eest of the Kaapvaal craton, southern Africa