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New and published whole-rock major-element contents of xenolithic peridotites, combined with mineral trace-element, 87Sr/86Sr, 143Nd/144Nd, and 3He/4He isotopic compositions, are used to unravel the metasomatic history of lithospheric mantle sampled by volcanic pipes in the Tanzanian section of the East African Rift. The deepest portion of the mantle beneath Labait (craton margin) exhibits high-μ (HIMU)–like 87Sr/86Sr (0.7029), 143Nd/144Nd (0.51286), and 3He/4He (5.9), which may reflect the plume in this region. Within the Mozambique belt, recent calcio-carbonatite melt metasomatism has overprinted the mantle...

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