Water content in arc basaltic magma in the Northeast Japan and Izu arcs: an estimate from Ca/Na partitioning between plagioclase and melt

Earth, Planets and Space

Table 2 Volcanoes which were estimated by Equation 1

Volcano	Reference	Sample name	An content	Mode	CaO/Na₂O (bulk)	Al₂O₃/SiO₂(bulk)	K _D ^Ca-Na _pl-melt	Estimated H₂O
Towada	Hunter and Blake (1995)	Zak13	91 to 94	92.5	4.71	0.36	4.74	5.6
Iwate^a	Kuritani et al. (2014a)	VIW-18	85 to 92	92	6.11	0.36	3.41	3.9
Funagata^a	Fujinawa (1982)	Type1	94.8		7.65	0.32	4.31	5.1
Zao	Tatsumi et al. (2008)	Za1013	80 to 96	92	4.94	0.35	4.21	5.0
Adatara	Fujinawa (1988; 1990)	2-1	78 to 95	90	4.10	0.39	3.98	4.7
Nasu (Minami-Gassan)	Ban (1991)	E-1 101408	86 to 92	89	4.58	0.35	3.20	3.7
Myoko	Sakuyama (1981)	MK278-4	80 to 94	88	3.65	0.36	3.63	4.2
Ueno	Nakano (1993, 1994)	SKS-3	82 to 87	87	3.81	0.31	3.18	3.7
Fuji	Kaneko et al. (2010)	FG1013	64 to 92	88	4.17	0.36	2.66	3.1
East-Izu	Kawamoto (1992)	Uchino	84 to 88	86	3.27	0.36	4.06	4.8
	Kikuchi and Takahashi (2004)	Takatsukayama, scoria1-2	84 to 88	87	3.84	0.37	2.53	3.7
Izu-Oshima	Ikehata et al. (2010)	O95	88 to 90	89	6.42	0.34	2.28	2.6
Niijima	Koyaguchi (1986)	WAK-10	71 to 92	91	4.28	0.34	4.28	5.1
Miyakejima	This study	OFS	90 to 96	94	6.37	0.36	4.45	5.3
	Amma-Miyasaka et al. (2005)	S-1	53 to 97	87	4.68	0.35	2.59	3.0
Hachijo-Higashiyama	Tsukui et al. (1993)	Nakanohana scoria	85 to 93	92	8.60	0.37	2.42	2.7
Sumisu-caldera	Tamura et al. (2005)	D2-R4	80 to 90	90	5.92	0.34	2.75	3.2
Torishima^a	Tamura et al. (2007)	OP 35	95.9		10.15	0.37	4.17	4.9

^aReference had no frequency distribution of plagioclase phenocryst compositions.