Hong Kong Geology Guide Book Geotechnical Engineering Office ...

Fan Lau, Lantau Island
Introduction
19. Tong Fuk Quartz Monzonite and Fan Lau Granite
The Mesozoic intrusive rocks of Hong Kong have been classified into four suites that
represent four main phases of intrusive magmatism. These four suites can be
correlated with four major volcanic groups. Although the Tong Fuk Quartz Monzonite
and Fan Lau Granite are different rock types, they both belong to the youngest Lion
Rock Suite. The Tong Fuk Quartz Monzonite occurs intermittently around the
northern and southern margins of the main outcrop of the Upper Jurassic Lantau
Volcanic Group (mainly on the southern margin), and was probably intruded along
ring faults associated with the Lantau caldera. In contrast, the Fan Lau Granite is
exposed only on the Fan Lau peninsula, so can be regarded as a relatively minor body.
Granitic rocks are the second most common rock type in Hong Kong, with volcanic
rocks covering a larger area. In addition, granite weathers more deeply than the
volcanic rocks. Consequently, outcrops of fresh granite are generally much less
common than those of volcanic rock. However, there are excellent exposures of the
Tong Fuk Quartz Monzonite and the Fan Lau Granite on the Fan Lau peninsula.
Access to Fan Lau, Lantau Island
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