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Progress in Earth and Planetary Science
Fig. 6 | Progress in Earth and Planetary Science

Fig. 6

From: Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion

Fig. 6

Major-element mineral compositions (in wt%). Average data with 1 SD in c. The lines in c represent compositional trends defined by lower crustal rocks from fast-spreading EPR (pink), slow-spreading MAR (pale blue), and ultraslow-spreading SWIR (gray) by Basch et al. (2020). Amphibole classification in d is after Leake et al. (1997). Abbreviation: apfu = atoms per formula unit, Cpx = clinopyroxene, Dol = dolerite, Ga = gabbro, Ol ga = olivine gabbro, Ox ga = oxide gabbro, Pe = peridotite, and Pl = plagioclase

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