About Us

The Geology of Hong Kong (Interactive On-line)
Late-stage felsic dykes - qrd


Late-stage felsic dykes - qrd


Stratigraphy: Scattered quartzphyric rhyolite dykes cut the youngest volcanic and plutonic rocks. Little is known about their geochemical characteristics and they have not yet been dated radiometrically.


Distribution: The dykes concentrate in the eastern New Territories, Kowloon, Hong Kong Island and the Po Toi Islands. The dykes vary in trend from northnorthwest to eastnortheast.


Lithology: Quartzphyric rhyolite.


Strongly Flow-Banded, Quartzphyric Rhyolite Dyke Intruding a Porphyritic Microgranite Dyke

(Strongly Flow-Banded, Quartzphyric Rhyolite Dyke Intruding a Porphyritic Microgranite Dyke. Both Dykes Intrude Medium-Grained Granite, Pak Kok Tsui, Cheung Chau)


Read more...