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Quaternary volcanics from San Luis Potosi (SLP) in central Mexico sampled a xenolith suite comprising upper-mantle nodules (spinel lherzolites, hornblende pyroxenites, spinel pyroxenites) and lower-crustal xenoliths. The latter consist of granulite-facies, mafic to intermediate metaigneous rocks and high-grade metasediments. Precursors of the metaigneous suite range from gabbroic to tonalitic compositions...