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    40Ar/39Ar ages of seamount trachytes from the South China Sea and implications for the evolution of the northwestern sub-basin

    231262_231262.pdf (1.401Mb)
    Access Status
    Open access
    Authors
    Li, X.
    Li, J.
    Yu, X.
    Wang, C.
    Jourdan, Fred
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Li, X. and Li, J. and Yu, X. and Wang, C. and Jourdan, F. 2015. 40Ar/39Ar ages of seamount trachytes from the South China Sea and implications for the evolution of the northwestern sub-basin. Geoscience Frontiers. 6 (4): pp. 571-577.
    Source Title
    Geoscience Frontiers
    DOI
    10.1016/j.gsf.2014.08.003
    ISSN
    1674-9871
    School
    Department of Applied Geology
    Remarks

    This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by-nc-nd/3.0

    URI
    http://hdl.handle.net/20.500.11937/11001
    Collection
    • Curtin Research Publications
    Abstract

    A chronological study of seamount rocks in the South China Sea basin provides a great opportunity to understand the expansion and evolution history of the sea basin. In this paper, we analyzed the 40Ar/39Ar age of trachytic samples collected from the Shuangfeng seamounts in the northwestern sub-basin of the South China Sea. The two samples yielded plateau ages of 23.80 ± 0.18 and 23.29 ± 0.22 Ma, respectively, which indicate magmatic activity in late Oligocene which helpful constraints the expansion time of the northwest sub-basin. Previous studies suggested that the northwestern sub-basin and southwestern sub-basin have experienced a relatively consistent expansion in the NW–SE direction followed by a late expansion of the eastern sub-basin. We concluded that the expansion of the northwestern sub-basin began prior to ca. 24 Ma, which also implicated magmatic events of a late or stop expansion of the northwestern sub-basin combined with our results of 40Ar/39Ar age data and previous geophysical data.

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