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Major and trace elements, and volatile components have been measured in melt inclusions in olivine from fresh 2.7Ga old komatiites from the Reliance Formation of the Belingwe Greenstone Belt, Zimbabwe. Reconstructed compositions of melt inclusions contain 20–23.5wt% MgO and up to 0.3wt% H2O; these compositions probably represent those of the erupted lava. In inclusions in relatively evolved (low Fo)...