High precision U-Pb zircon ages for Mesozoic igneous rocks from Hong Kong |
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| Authors: | RJ Sewell DW DavisSDG Campbell |
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| Institution: | a Geotechnical Engineering Office, Civil Engineering and Development Department, 101 Princess Margaret Road, Kowloon, Hong Kong Special Administrative Region, China
b Jack Satterly Geochronology Laboratory, Department of Geology, University of Toronto, Toronto, Ont., Canada |
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| Abstract: | Sixteen new high precision U-Pb zircon ages are reported from Jurassic and Early Cretaceous silicic volcanic and plutonic rocks of Hong Kong. When combined with the existing age dataset, the new ages constrain more tightly the timing of major periods of volcanism and plutonism at 162.6 ± 4.5 Ma, 146.7 ± 1.1 Ma, 143.0 ± 1.0 Ma and 140.8 ± 0.6 Ma. However, two ages of 151.9 ± 0.2 Ma and 148.1 ± 0.2 Ma, from eastern New Territories and southern Hong Kong indicate additional and therefore more continuous, albeit pulsed, magmatic activity than previously thought. |
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| Keywords: | Hong Kong U-Pb dating Mesozoic Zircon |
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