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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

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

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