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The Geology of Hong Kong (Interactive On-line)
East Lantau Rhyodacite - Jkd

East Lantau Rhyodacite - Jkd

Stratigraphy: Jurassic dyke swarm with an age of approximately 146.5 ± 0.2 million years before present.

Distribution: Dykes of the East Lantau Rhyodacite are concentrated mainly in northern and eastern Lantau Island, with minor distribution in central Lantau Island and on Ma Wan, the Soko Islands.

Lithology: Feldsparphyric rhyodacite to porphyritic granite dykes.

Lamellar Fracturing in Coarsely Megacrystic Medium-grained Granite