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    Episodic Precambrian crust growth: Evidence from U–Pb ages and Hf–O isotopes of zircon in the Nanhua Basin, central South China

    Access Status
    Fulltext not available
    Authors
    Wang, Xuan-Ce
    Li, X.
    Li, Zheng-Xiang
    Li, Q.
    Tang, G.
    Gao, Y.
    Zhang, Q.
    Liu, Y.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, Xuan-Ce and Li, Xian-Hua and Li, Zheng-Xiang and Li, Qiu-Li and Tang, Guo-Qiang and Gao, Yu-Ya and Zhang, Qi-Rui and Liu, Yu. 2012. Episodic Precambrian crust growth: Evidence from U–Pb ages and Hf–O isotopes of zircon in the Nanhua Basin, central South China. Precambrian Research. 222-223: pp. 386-403.
    Source Title
    Precambrian Research
    DOI
    10.1016/j.precamres.2011.06.001
    ISSN
    0301-9268
    URI
    http://hdl.handle.net/20.500.11937/26778
    Collection
    • Curtin Research Publications
    Abstract

    We report here the first integrated U–Pb dating and hafnium–oxygen isotope analyses of detrital zircon grains from sedimentary and volcaniclastic rocks in the Neoproterozoic Nanhua Basin, central South China. These data provide vital information on the depositional cycles of the Cryogenian strata and their bearings on the breakup of the Rodinia supercontinent, and the characteristics of Precambrian crustal growth in the South China Block and neighboring continents. Zircon SIMS U–Pb ages indicate that the Qingshuijiang Formation was deposited at 772 ± 5 Ma and the Fanzhao Formation was deposited between 800 and 770 Ma. The onset time of the Sturtian (Jiangkou) glaciation is constrained to be no older than 730 Ma. Together with compilations of all available high precision zircon U–Pb data on tuff beds in the Nanhua Basin, our work demonstrates that the Cryogenian deposition in South China began at about 850 Ma and had three depositional cycles at ca. 850–820 Ma, 820–720 Ma and 720–635 Ma. Hf isotope analyses and U–Pb dating, combined with existing O isotope analyses, of detrital zircon have revealed three striking features for grains with 1.0–0.7 Ga ages: (1) about 22% of total analysed grains have Hf isotope compositions that plot between the new continental crust and depleted mantle growth curves; (2) about 80% of zircon grains have δ18O values below 6.5‰; and (3) 950–700 Ma is the most dominant age group in the total of 1616 concordant detrital zircon ages from the Cryogenian sedimentary rocks. The Early Neoproterozoic (1.0–0.7 Ga) thus appears to have witnessed significant juvenile crustal growth in South China. In addition, zircon analyses of the Cryogenian sedimentary rocks revealed 3.2–2.9 Ga and possibly 2.7–2.4 Ga as two additional episodes of juvenile crust growth in South China and neighboring continents.

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