Table 6.4 - Summary of the field and petrographic characteristics of the Cheung Chau Suite
CHEUNG CHAU SUITE
| UNIT | Shui Chuen O Granite | Chi Ma Wan Granite | Shan Tei Tong Rhyodacite | Luk Keng Quartz Monzonite |
|---|---|---|---|---|
| Colour | light grey or pink | light grey or pink | pinkish white | light pinkish white |
| Rock Type | biotite monzogranite | biotite monzogranite | rhyodacite | quartz monzonite |
| Dominant texture | porphyritic medium grained | equigranular medium grained | porphyritic very fine grained | megacrystic medium grained |
| Mafic minerals | biotite | biotite | biotite | hornblende, biotite |
| Feldspar | zoned oligoclase perthitic orthoclase | microcline mesoperthite, albite | zoned oligoclase | orthoclase albite |
| Accessory minerals | zircon, apatite, Fe-oxide | zircon, titanite, allanite, apatite, Fe-oxide | zircon, allanite, apatite, Fe-oxide | zircon, titanite, allanite, apatite, Fe-ocide |
| Alkali feldspar megacrysts | common | absent | common | common |
| Pluton shape | irregular | circular | (dyke swarm) | irregular |
| Area exposed (km2) | 8 | 14 | - | 3 |
| Mineralization | - | - | - | - |