Thirteen peridotite xenoliths from Bultfontein, S. Africa, are characterized by recrystallization zones and both grain-boundary and coarser veins with abundant mica, amphibole, and diopside, and minor Ba-Sr-Ca-Zr-Cr-titanate (crichtonite structure; enriched in light rare earths), Cr-spinel, and Mg-ilmenite. Although a genetic relationship to the MARID-suite (mica-amphibole-rutile-ilmenite-diopside) is suggested by the overall mineralogy and high concentrations of trace elements, some details must be considered if the peridotites are to represent veined and metasomatized wall-rock to a magma body which formed MARID "pegmatites." The micas and amphiboles of the two suites do not overlap in composition, and two peridotites show at least two veining events. Perhaps the peridotites were invaded by several Ti-rich liquids, one of which evolved to yield MARID pegmatites. One distinct peridotite has linear veinlets of mica, Zr-Nb-rutile, and serpentine, which cut the rock fabric. The micas are richer in Ti than those from primary-metasomatic veins at Matsoku.
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Jones et al. (1982) studied this question.
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