Fig. 5
Major-element compositions of minerals in ultramafic xenoliths. The circles describe the core parts of peridotite xenoliths, and the rhombuses describe pyroxenite xenoliths. Fo# and Mg# equal 100 × Mg2+/[Mg2+ + Fe2+] for olivine and clinopyroxene. Mantle olivine arrays are quoted from Takahashi et al. (1987). a Major-element compositions of olivine. b Ca–Mg–Fe pyroxene classification diagram, from Morimoto (1988). Symbols are the same as in (a). c TiO2 versus Mg# clinopyroxene classification from Wass (1979). Cpx rind (triangles) is microcrystals surrounding each xenolith, and groundmass Ti-augite (box with x) is in 6K#1466R6-001 basalt. d Clinopyroxene major-element composition, of Cr2O3 versus Al2O3. The detailed values are shown in Additional file 4: Table S2. The mineral compositions of abyssal peridotite (East Pacific Rise; Dick and Natland 1996; Regelous et al. 2016), peridotite xenoliths from NW Pacific petit-spots (site A, B; Yamamoto et al. 2014; Pilet et al. 2016), peridotite xenoliths from the Pali vent and Salt Lake Crater, Hawaii (Bizimis et al. 2007), and Tahitian harzburgite (Akizawa et al. 2017) are shown here