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Introduction Peridotite xenoliths containing equilibrated, coexisting chromite+garnet assemblages are of special interest to mantle researchers because their low-variance assemblage(s) constrain critical P-T-X relationships among Olivine (Ol), orthopyroxene (Opx), clinopyroxene (Cpx), Cr-pyrope garnet (CrGt), chromite (CrSp) ± diamond ± graphite (Dia/Gph) (e.g. Grütter et al, 2006; Ziberna et al, 2013). A veritable treasure trove of such CrSp+CrGt±Dia assemblages from the ~114 Ma Newlands kimberlite and the ~118 Ma Bellsbank-Bobbejaan fissure were described in Ph.D. theses by Menzies (2001 [ME01]) and Ivanic (2007 [IV07]), and substantive portions of these valuable data sets are now published (Menzies et al., 1999 [ME99]; Ivanic et al., 2012 [IV12]). Cr-pyrope compositions in the IV12 data set cover a significant CaO range and show striking Cr-zoned trends (Fig. 1) that IV12 interpret as resulting from metamorphic re-equilibration during a postulated 10-20 kbar 0 5 10 15

Discrete Ti-Al±Ca metasomatism at ~53 kbar in chromite-garnet peridotites from Newlands kimberlite, South Africa