Mineralogical evidence of the magma mixing at Hualalai volcano, Hawaii

A detailed study of olivine phenocrysts and the primary magmatic inclusions in them has revealed that the alkali olivine basalt of the alkali series of Hualalai Volcano, Hawaii contains two compositionally different olivine-spinel assemblages that originated as a result of crystallization of compositionally different magmas. It is concluded that the parent magmas of the Hualalai alkali series mixed not long before the eruption with low-Ca, high-Ti magma that had crystallized at a depth level of the crust-mantle interface.