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    The 600–580 Ma continental rift basalts in North Qilian Shan, northwest China: Links between the Qilian-Qaidam block and SE Australia, and the reconstruction of East Gondwana

    Access Status
    Fulltext not available
    Authors
    Xu, X.
    Song, S.
    Su, L.
    Li, Zheng-Xiang
    Niu, Y.
    Allen, M.
    Date
    2015
    Type
    Journal Article
    
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    Citation
    Xu, X. and Song, S. and Su, L. and Li, Z. and Niu, Y. and Allen, M. 2015. The 600–580 Ma continental rift basalts in North Qilian Shan, northwest China: Links between the Qilian-Qaidam block and SE Australia, and the reconstruction of East Gondwana. Precambrian Research. 257: pp. 47-74.
    Source Title
    Precambrian Research
    DOI
    10.1016/j.precamres.2014.11.017
    ISSN
    0301-9268
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/12780
    Collection
    • Curtin Research Publications
    Abstract

    We report a sequence of thick, well-preserved basaltic lavas interlayered with shallow marine dolomitic carbonates, mudstones and siltstones of the Zhulongguan Group, in the western segment of the North Qilian orogen, northwest China. Two new zircon SIMS ages show that this sequence formed at ~600–580 Ma. The mafic volcanics can be subdivided into tholeiitic and alkaline basalts, and have compositions similar to present-day ocean island basalt (OIB) or continental flood basalts. The occurrence, geochemical features and age data suggest that the Zhulongguan basalts originated at a continental rift setting in the latest Neoproterozoic, within the north margin of the Qilian-Qaidam block. This volcanic-sedimentary formation exhibits close affinity to the passive continental margin in southeastern Australia. Our observations favor a link of the Qilian-Qaidam block with SE Australia (also south China) during the breakup of Rodinia, thereby filling a void in existing reconstructions of the region.

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