One of my major motivations for getting into geochemical SIMS was analysing mantle minerals for trace elements in situ. Combined with our increasing knowledge during the 1970s on mineral-melt partitioning, I thought it was important to document mantle minerals for their trace element abundances. Peridotite xenoliths had always been important sources of insights into mantle petrology and mineralogy and a significant volume of literature already existed on this topic since the late 1960s (for instance, see Wyllie’s book published in 1967: “Ultramafic and Related Rocks”), but trace element and isotope geochemistry on peridotite xenoliths lagged behind due...

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