Abstract
by melting a lherzolitic source. Instead, they reflect mixing between One plagioclase–spinel lherzolite and four spinel lherzolite xenoliths two components: (1) the pooled melt derived from lherzolitic source from Oahu, Hawaii, contain clinopyroxene grains that show homoin a passive melting regime with an Fmax of 30% (~80% of the geneous rare earth element (REE) abundances and smooth REE mixture) and (2) melt derived from garnet pyroxenite by 40% patterns with systematic depletion of light REE (LREE). These fractional melting (~20% of the mixture). This model produces five xenoliths are mid-ocean ridge basalt (MORB) magma-depleted 7·1 km of crust. residues with compositions that were not modified by later metasomatism. Trace element systematics of these xenoliths were used to investigate the melt production rate (dF/dP) within a 90-my-old residual mantle column (RMC). Such rates were calculated as
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