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

Several quartzphyric rhyolite dykes cut the youngest volcanic and plutonic lithologies in the eastern New Territories, Kowloon, Hong Kong Island and the Po Toi Islands. The dykes vary in trend from northnorthwest to eastnortheast. Little is known about their geochemical characteristics and they have not yet been dated radiometrically.