Figure 4: Two-stage mantle melting and source mixing to generate low-Ti primary Manihiki magmas. | Nature Communications

Figure 4: Two-stage mantle melting and source mixing to generate low-Ti primary Manihiki magmas.

From: Boninite-like intraplate magmas from Manihiki Plateau require ultra-depleted and enriched source components

Figure 4

(a) Primitive-mantle-normalized multi-element plot of incompatible elements showing the compositions of primary low-Ti melts calculated from the compositions of Manihiki glasses (Supplementary Table 3; red circles); the ranges of melt compositions produced by pooled (aggregate) fractional melting from 1% to 15% of primitive mantle (PM) and of residual primitive mantle after 5% (PM-5%) and 10% (PM-10%) fractional melting; and residual mantle compositions after 5% and 10% previous melt extraction (yellow and green triangles, respectively). (b) The compositions of second stage melts produced by 8.7% pooled fractional melting of an UDM source. The UDM source was previously generated by 10.6% melt extraction from PM and subsequent enrichment/metasomatism with variable amounts (indicated in wt%) of melt corresponding in composition to the mafic Rurutu sample #RRT-B-30 from ref. 34. Details of the melt modelling are given in the discussion and input parameters in Supplementary Table 4.

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