Sample | SiO2 | TiO2 | Al2O3 | FeO" | MnO | MgO | CaO | K2O | Na2O | n | Total"" | Remark |
---|---|---|---|---|---|---|---|---|---|---|---|---|
B-Tm ash in SKN-W (1) | 75.0 | 0.2 | 10.9 | 4.0 | 0.1 |  ~  ~ 01 | 0.3 | 4.3 | 5.1 | 8 | 96.5 |  |
 | 0.6 | 0.1 | 0.3 | 0.1 | 0.1 | 0.0 | 0.1 | 0.2 | 0.1 |  | 0.6 |  |
B-Tm ash in SKN-W (2) | 67.6 | 0.4 | 15.1 | 4.5 | 0.2 | 0.2 | 1.1 | 5.1 | 5.6 | 12 | 97.5 | Â |
 | 1.2 | 0.1 | 0.5 | 0.2 | 0.1 | 0.1 | 0.3 | 0.2 | 0.2 |  | 0.5 |  |
88–89 cm in depth of SKN-GS1 (1) | 74.8 | 0.2 | 11.0 | 4.0 | 0.1 | 0.1 | 0.3 | 4.5 | 5.0 | 6 | 96.0 |  |
B-Tm | 0.7 | 0.1 | 0.3 | 0.1 | 0.1 | 0.0 | 0.2 | 0.3 | 0.2 | Â | 0.9 | Â |
88–89 cm in depth of SKN-GS1 (2) | 67.8 | 0.4 | 15.0 | 4.6 | 0.2 | 0.2 | 1.1 | 5.1 | 5.6 | 14 | 97.4 |  |
B-Tm | 1.1 | 0.1 | 0.5 | 0.2 | 0.1 | 0.1 | 0.2 | 0.2 | 0.1 | Â | 0.7 | Â |
170–172 cm in depth of SKN-GS5 | 74.7 | 0.5 | 13.6 | 2.5 | 0.2 | 0.7 | 2.6 | 1.2 | 4.0 | 19 | 96.6 |  |
To-Cu | 0.3 | 0.1 | 0.3 | 0.3 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | Â | 0.7 | Â |
170–172 cm in depth of SKN-GS5 | 77.9 | 0.2 | 12.5 | 1.4 | 0.1 | 0.3 | 1.7 | 2.5 | 3.4 | 11 | 97.4 |  |
Other tephra | 0.4 | 0.1 | 0.4 | 0.3 | 0.1 | 0.0 | 0.3 | 0.4 | 0.1 | Â | 1.6 | Â |
AT | 78.0 | 0.1 | 12.5 | 1.3 | 0.1 | 0.2 | 1.1 | 3.2 | 3.5 | 24 | 93.9 | Â |
Working standard | 0.4 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | Â | 1.4 | Â |
To-Cu ash in SKN-E | 74.5 | 0.5 | 13.5 | 2.5 | 0.2 | 0.7 | 2.7 | 1.2 | 4.0 | 16 | 98.7 | Ishimura and Hiramine (2020) |
 | 0.3 | 0.1 | 0.3 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |  | 0.6 |  |