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Petrography and electron microprobe analysis were used to investigate the mineralogy, bulk composition, abundance, and distribution of Cu-Fe-Ni sulfide phases in a suite of about 25 alkalic-basalt-hosted xenoliths from Kilbourne Hole, New Mexico. The xenoliths include spinel lherzolites, spinel clinopyroxenites, clinopyroxene megacrysts, mafic granuloblastites, and a sillimanite-quartz granuloblastite. Sulfide abundance is low in all the xenoliths, but shows a maximum (∼0.5 vol. %) in pyroxenites and megacrysts. The sulfides occur as interstitial to silicate and oxide grains, fully enclosed and isolated in grains, and along fracture surfaces in grains. The major sulfide phase is monosulfide solid solution (∼pyrrhotite), accompanied by...

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