Tephra name | Major element composition (wt.%) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
SiO2 | TiO2 | Al2O3 | FeO* | MnO | MgO | CaO | Na2O | K2O | ||
Ahn (AhG) | Ave | 77.31 | 0.06 | 12.63 | 0.98 | 0.08 | 0.06 | 0.78 | 3.29 | 4.80 |
Urago Fm | SD | 0.17 | 0.04 | 0.09 | 0.07 | 0.06 | 0.03 | 0.05 | 0.08 | 0.14 |
Onr | Ave | 77.34 | 0.08 | 12.70 | 0.95 | 0.07 | 0.04 | 0.80 | 3.26 | 4.76 |
Kurotaki Fm | SD | 0.14 | 0.04 | 0.08 | 0.09 | 0.06 | 0.02 | 0.05 | 0.11 | 0.10 |
IkT19 (Ikg1) | Ave | 78.43 | 0.25 | 12.15 | 1.55 | 0.09 | 0.28 | 1.98 | 3.79 | 1.47 |
Ikego Fm | SD | 0.41 | 0.05 | 0.15 | 0.16 | 0.06 | 0.03 | 0.18 | 0.08 | 0.10 |
An158.5 | Ave | 78.51 | 0.25 | 12.10 | 1.54 | 0.09 | 0.25 | 1.89 | 3.84 | 1.53 |
Anno Fm | SD | 0.26 | 0.06 | 0.15 | 0.10 | 0.07 | 0.03 | 0.10 | 0.07 | 0.08 |
IkT16 | Ave | 76.95 | 0.19 | 12.59 | 2.51 | 0.10 | 0.16 | 2.44 | 3.92 | 1.15 |
Ikego Fm | SD | 0.19 | 0.07 | 0.08 | 0.14 | 0.07 | 0.05 | 0.08 | 0.07 | 0.06 |
An157.5 | Ave | 76.86 | 0.17 | 12.56 | 2.59 | 0.14 | 0.16 | 2.47 | 3.89 | 1.15 |
Anno Fm | SD | 0.20 | 0.08 | 0.07 | 0.08 | 0.08 | 0.03 | 0.06 | 0.09 | 0.05 |
Ng | Ave | 77.82 | 0.31 | 12.03 | 1.36 | 0.10 | 0.24 | 1.47 | 3.26 | 3.41 |
Zushi Fm | SD | 0.23 | 0.06 | 0.09 | 0.07 | 0.07 | 0.06 | 0.05 | 0.20 | 0.30 |
Ky25 | Ave | 77.94 | 0.27 | 12.01 | 1.32 | 0.10 | 0.23 | 1.45 | 3.21 | 3.46 |
Kiyosumi Fm | SD | 0.16 | 0.07 | 0.10 | 0.11 | 0.06 | 0.04 | 0.08 | 0.16 | 0.21 |
Trace element composition (ppm) | ||||||||||
Ba | La | Sc | Sr | V | Y | Ba/La | La/Y | |||
Ahn (AhG) | Ave | 658.19 | 26.09 | 6.29 | 66.53 | 0.83 | 19.64 | 25.2 | 1.3 | |
Urago Fm | SD | 29.60 | 1.77 | 0.88 | 5.31 | 0.07 | 1.67 | |||
Onr | Ave | 638.93 | 26.27 | 4.95 | 76.63 | 0.34 | 21.67 | 24.3 | 1.2 | |
Kurotaki Fm | SD | 29.31 | 1.98 | 0.63 | 5.90 | 0.14 | 1.34 | |||
IkT19 | Ave | 480.9 | 16.0 | 12.1 | 118.1 | 4.3 | 44.7 | 30.0 | 0.4 | |
Ikego Fm | SD | 26.4 | 1.1 | 1.9 | 9.3 | 0.5 | 2.7 | |||
An158.5 | Ave | 437.8 | 13.7 | 12.3 | 114.4 | 4.3 | 47.3 | 31.9 | 0.3 | |
Anno Fm | SD | 15.0 | 1.1 | 1.6 | 7.0 | 0.3 | 2.6 | |||
IkT16 | Ave | 284.9 | 12.4 | 19.7 | 140.6 | 0.2 | 33.6 | 23.0 | 0.4 | |
Ikego Fm | SD | 17.1 | 0.6 | 1.5 | 11.8 | 0.1 | 2.0 | |||
An157.5 | Ave | 287.6 | 12.6 | 19.6 | 136.2 | 0.1 | 34.1 | 22.8 | 0.4 | |
Anno Fm | SD | 14.8 | 0.9 | 1.6 | 8.3 | 0.1 | 2.0 | |||
Ng | Ave | 583.4 | 16.4 | 10.4 | 91.8 | 9.7 | 35.0 | 35.5 | 0.5 | |
Zushi Fm | SD | 19.4 | 1.3 | 1.9 | 7.9 | 0.8 | 2.2 | |||
Ky25 | Ave | 542.8 | 14.9 | 9.9 | 86.6 | 8.0 | 32.3 | 36.4 | 0.5 | |
Kiyosumi Fm | SD | 16.6 | 1.0 | 1.0 | 6.3 | 0.8 | 1.8 |