“…The volcanic rocks of the Chichibu AC are dominated by olivine and clinopyroxene porphyric basalt and mafic volcaniclastics with subordinate plagioclase porphyrite, dolerite, tuff and aphyric lava (Ishizuka et al, 2003;Onoue et al, 2004;Safonova et al, 2015a). The Mikabu belt is dominated by mafic-ultramafic bodies (Toba complex), alkaline and tholeiitic basaltic lavas, coarse-and fine-grained pyroclastic rocks (Nakamura, 1971;Nakayama, 1983;Ozawa et al, 1997;Kato and Saka, 2006). The Mikabu samples under study are porphyric and aphyric basalts and mafic cumulates ( Fig.…”