Table 5.A3 – Major Element Analyses of Rhyolitic Tuff and Rhyolite Samples
| Element | Rhyolitic Tuff Ap Lei Chau Formation Ngong Ping Shan (4407 2854) HK 202 |
Intrusive Rhyolite Sai Kung Road Sheet 8 (4619 3007) HK 217 |
|---|---|---|
| SiO2 | 75.88 | 71.22 |
| TiO2 | 0.11 | 0.27 |
| Al2O3 | 13.10 | 14.30 |
| Fe2O3 | 0.69 | 0.76 |
| FeO | 0.89 | 1.56 |
| MnO | 0.06 | 0.11 |
| MgO | 0.05 | 0.20 |
| CaO | 0.58 | 1.16 |
| Na2O | 3.70 | 3.39 |
| K2O | 5.62 | 6.30 |
| H2O+ | 0.33 | 0.42 |
| H2O- | 0.12 | 0.13 |
| P2O5 | 0.01 | 0.05 |
| CO2 | — | — |
| Total | 100.84 | 99.87 |