Appendix Figure and Table Captions

Appendix figure and table captions

Fig. A1. a. Clinopyroxene (cpx) phenocryst (left), Orthopyroxene (opx) phenocryst (upper right), and plagioclase (pl) phenocrysts (lower left) with some pl microphenocrysts in a typical 2-px volcanics dredged from site KT94-10 D02 (sample D02-06). Crossed polars. b. Cpx phenocryst (center) with pl phenocrysts and microphenocrysts in a dacite of 2-px volcanics from the same site KT94-10 D02 (sample D02-15). Crossed polars. c. Cpx phenocrysts (center) and plagioclase phenocrysts in a typical sample of cpx volcanics dredged from the site KT94-10 D03 (sample D03-13). Complex twinning texture is observed in the left and upper plagioclase phenocrysts. Crossed polars. d. Hornblende (hbl) phenocryst (center), cpx phenocryst (lower right) and pl phenocryst (right) in the andesite of cpx suite from the same site KT94-10 D03 (sample D03-01). Plane polarized light. e. Cpx phenocryst (center) with pl phenocrysts in the sample of cpx volcanics from the site KT98-19 D02 (sample D02-01) Crossed polars. f. Cpx phenocrysts (center) with pl microphenocrysts in the andesite of cpx volcanics from the site KT98-19 D04 (sample D04-07). Crossed polars.

Fig. A2. Phenocryst compositions of pyroxene in selected rocks from the 2-px volcanics at the Miyazaki SMT (KT94-10 D02) and the cpx volcanics at the Nichinan SMT (KT94-10 D03) on pyroxene quadrilateral plots. Crystallization temperatures are estimated by two-pyroxene geothermometry according to Ishii (1975).

Fig. A3. Plagioclase phenocryst compositions (anorthite, or An content) versus frequency for the same rocks plotted in Fig. A1.

Fig. A4. Al2O3 (a), TiO2 (b) and Cr2O3 (c) contents of cpx phenocrysts versus Mg# for the samples of the 2-px volcanics at the Miyazaki SMT, cpx suites at the Nichinan SMT and other cpx volcanics in the northern KPR.

Fig. A5. LILE, HFSE and REE ratio, Ba/Zr vs. Th/Zr (a), Ba/Nb vs. Th/Nb (b), Ba/Th vs. Th/Nb (c) and U/Th vs. Th/Nb (d) plots of the volcanics in the northern KPR and those of the pre- and post-backarc spreading volcanisms. The vectors and MORB and BABB compositions are from Ishizuka et al. (2003) in 9a, Hochstaedter et al. (2001) in 9b and Machida et al (2008) in 9c and d. Symbols are same as the Fig. 7.

Table A1. Bulk rock composition of all volcanic rocks estimated by XRF and ICP-MS from the northern KPR dredged during the cruises KT94-10 and KT98-19.

Table A2. Referenced standard values and Analytical Results for JB-2 and JB-3 of ICP-MS analyses.

Table A3. Representative selected mineral analyses of TPV and ECV samples.

Table A4. Least-square fractional crystallization results, and the ratios of measured value over calculated value (Cm/Cc) of the trace element compositions of the daughter materials for the TPV and ECV

The model composition in wt. % of the model solid, the volume % of solids removed, the used mineral compositions are the average of phenocryst composition of parent, and the sum of the residuals (sigma r2) for the major element calculations are presented.

Table A5. Geochemical comparison of the island arc volcanics in the Izu-Ogasawara (Bonin) arc from early arc volcanism to recent activity.

The original data of the Haraguchi and Ishii (2007) is from Arculus et al. (1992). The age data are referred from references in this table, Cosca et al. (1998), Shibata and Okuda (1975), Shibata et al. (1977) and Taylor and Mitchell (1992).