Table 5.A1 – Major Element Analyses of Tuff Samples from the Repulse Bay Volcanic Group
| Element | Yim Tin Tsai Formation - St Christopher's Orphanage (3817 3230) HK 216 |
Shing Mun Formation - Tai Po Kau Reserve (3630 3185) HK 215 |
Tai Mo Shan Formation - Tai Mo Shan (3091 3033) HK 228 |
|---|---|---|---|
| SiO2 | 71.04 | 73.61 | 68.96 |
| TiO2 | 0.45 | 0.36 | 0.6 |
| Al2O3 | 13.67 | 12.59 | 13.89 |
| Fe2O3 | 2.73 | 1.19 | 1.44 |
| FeO | 0.73 | 1.77 | 2.92 |
| MnO | 0.07 | 0.06 | 0.09 |
| MgO | 0.79 | 0.73 | 1.32 |
| CaO | 2.41 | 2.65 | 2.93 |
| Na2O | 2.46 | 1.8 | 1.69 |
| K2O | 4.69 | 4.77 | 4.92 |
| H2O+ | 0.96 | 0.74 | 1.4 |
| H2O- | 0.14 | 0.09 | 0.14 |
| P2O5 | 0.09 | 0.07 | 0.14 |
| CO2 | — | — | — |
| Total | 100.23 | 100.43 | 100.44 |