Stratigraphy: The Luk Keng Quartz Monzonite comprises Cretaceous stocks and dykes with an age of approximately 142.8 ± 0.2 million years before present.

Distribution: The Luk Keng Quartz Monzonite crops out in Luk Keng, Fan Lau and Cha Kwo Chau on the southeastern margin of the Lantau Caldera.

Lithology: Megacrystic fine-grained quartz monzonite.

(Double enclave relationship of a Lantau Granite clast enclosed by megacrystic Luk Keng Quartz Monzonite, itself enclosed by Tong Fuk Quartz Monzonite, Fan Lau, Lantau Island)