Petrological characteristics and volatile content of magma of the 1979, 1989, and 2014 eruptions of Nakadake, Aso volcano, Japan

Earth, Planets and Space

Table 1 Whole-rock composition of scoria from the November 26–27, 2014, eruption (wt%). The composition of scoria from the 1979 and 1989 eruptions is also shown

Eruptions	1979			1989				November 26–27, 2014
Sample ID	GK790616	GK791126	OW1985	ASO891006	ASO891010	ASO891012	ASO891014	1127 K-2	I141129S01	I141129S02	I141129S03	I141129S04
SiO₂	54.64	54.37	54.16	53.97	53.95	54.03	53.96	54.05	54.24	53.93	53.97	53.87
TiO₂	0.93	0.88	0.88	0.98	0.97	0.94	0.97	0.96	0.94	0.93	0.96	0.96
Al₂O₃	18.07	18.49	18.42	16.97	17.40	17.91	17.54	18.10	17.90	18.20	17.99	17.95
FeOt	8.23	8.31	8.34	8.86	8.74	8.40	8.53	8.45	8.54	8.33	8.59	8.55
MnO	0.15	0.15	0.15	0.16	0.15	0.15	0.15	0.16	0.17	0.16	0.16	0.17
MgO	3.69	3.47	3.48	3.99	3.84	3.48	3.63	3.76	3.95	3.70	3.92	3.77
CaO	8.76	8.77	8.74	8.56	8.50	8.62	8.54	8.59	8.86	8.72	8.75	8.67
Na₂O	3.03	2.95	3.38	3.03	3.13	3.07	3.19	3.08	3.01	3.05	3.03	3.00
K₂O	1.91	2.02	2.01	2.02	2.01	2.00	2.04	2.03	1.96	1.97	1.97	2.03
P₂O₅	0.26	0.29	0.29	0.30	0.30	0.29	0.30	0.29	0.28	0.28	0.28	0.28
Total	99.67	100.40	99.85	98.84	98.99	98.89	98.85	100.40	100.79	100.20	100.59	100.20

FeOt: Total FeO
Data on two 1979 scoria (GK790616 and GK791126) and four 1989 scoria are from GSJ and Kumamoto Univ (1990)
Data on OW1985 is scoria of November 1979 eruption from Ono and Watanabe (1985)
Samples I141129S01-04 were collected by GSJ and 1127 K-2 by JMA