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Extensive volcanic sequences of tholeiitic basalts, having near-flat REE patterns and spatially associated with komatiites, occur in many Archean Superior Province greenstone belts; they are considered to be fragments of intraoceanic volcanic plateaus derived from a plume. Basalts from the 2.9–3.0 Ga Lumby Lake greenstone belt, carefully screened for minimum alteration, have variable Nb/U ratios of...
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