Boninite magmatism is similar to komatiite magmatism but is produced by fluid-fluxed melting above a subduction zone.
2.
Boninite attains its high magnesium and very low titanium content via high degrees of partial melting within the convecting mantle wedge.
3.
Boninites can be derived from the peridotite residue of earlier arc tholeiite generation which is metasomatically enriched in LREE before boninite volcanism, or arc tholeiites and boninites can be derived from a variably depleted peridotite source which has been variably metasomatised in LREE.
4.
Sanukitoids and adakites are distinct from another variety of high-Mg andesite called boninite; boninites have major element concentrations similar to sanukitoids, but they are extremely depleted in incompatible trace elements ( e . g ., LREE ) despite their relatively high silica contents.
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