Kyushu / Name of sample: KO-5
| No. | District | Name of Pyroclastic Deposite | Age |
|---|---|---|---|
| 048 | Kanoya, Kagoshima Pref. | Aira-Ohsumi pumice flow | 16,000-23,000 |
Particle Size Distribution (wt%).
| -0.038mm | -0.075mm | -0.15mm | -0.3mm | -0.6mm | -1.18mm | -2.36mm | -4.75mm |
|---|---|---|---|---|---|---|---|
| 8.0 | 15.9 | 30.9 | 48.1 | 60.2 | 70.0 | 79.8 | 86.6 |
 Microphotographs of glass particles (size: 0.15-0.3mm).  X-ray powder diffraction pattern (F: feldspar, Q: quartz). |
Chemical Compositions and Content of Volcanic Glass (wt%).
| SiO2 | Al2O3 | Fe2O3 | TiO2 | CaO | MgO | Na2O | K2O | Ig.loss | Total | Content of Volcanic Glass |
|---|---|---|---|---|---|---|---|---|---|---|
| 70.36 | 13.16 | 2.48 | 0.12 | 2.58 | 0.62 | 3.20 | 2.95 | 3.49 | 98.96 | 66.39 |
DTG pattern of separated volcanic glass.
Chemical Compositions of Separated Vocanic Glass (wt%).
| SiO2 | Al2O3 | Fe2O3 | TiO2 | CaO | MgO | Na2O | K2O | Ig.loss | Total |
|---|---|---|---|---|---|---|---|---|---|
| 73.68 | 12.38 | 1.96 | 0.16 | 1.47 | 0.33 | 2.96 | 2.72 | 3.33 | 98.99 |