Geochemistry of the 755 Ma Mundine Well dyke swarm, northwestern Australia: Part of a Neoproterozoic mantle superplume beneath Rodinia?

X-H. Li, Zheng-Xiang Li, Michael Wingate, S-L. Chung, Y. Liu, G-C. Lin, W-X. Li

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    Abstract

    Geochemical and Nd-Hf isotopic data are reported for dolerite samples from the Neoproterozoic (755 Ma) Mundine Well dyke swarm in northwestern Australia. These dolerites are tholeiitic in composition, crystallised from a common parental magma. Although the dolerite magma underwent varying degrees of crustal contamination during ascent and emplacement, the uncontaminated parental melt possessed geochemical and Nd isotopic characteristics, such as Nb/La approximate to 1.5, Nb/Th approximate to 15, Nb/U approximate to 50, epsilon Nd(T) approximate to 5, and epsilon Hf(T) approximate to 9 (estimated by extrapolation from geochemical correlations), that closely resemble plume-derived ocean island basalts. These features are also similar to those of dolerite dykes of similar age from Seychelles and South China. We propose that these late Neoproterozoic mafic suites may have been generated by melting of a vast asthenospheric mantle superplume that developed beneath, and led to breakup of, the Rodinia supercontinent. (c) 2005 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)1-15
    JournalPrecambrian Research
    Volume146
    Issue number1-2
    DOIs
    Publication statusPublished - 2006

    Fingerprint

    Rodinia
    Geochemistry
    dike swarm
    diabase
    Extrapolation
    Melting
    Contamination
    geochemistry
    mantle
    Chemical analysis
    magma
    ocean island basalt
    crustal contamination
    supercontinent
    emplacement
    plume
    melting
    melt
    basalt

    Cite this

    Li, X-H. ; Li, Zheng-Xiang ; Wingate, Michael ; Chung, S-L. ; Liu, Y. ; Lin, G-C. ; Li, W-X. / Geochemistry of the 755 Ma Mundine Well dyke swarm, northwestern Australia: Part of a Neoproterozoic mantle superplume beneath Rodinia?. In: Precambrian Research. 2006 ; Vol. 146, No. 1-2. pp. 1-15.
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    title = "Geochemistry of the 755 Ma Mundine Well dyke swarm, northwestern Australia: Part of a Neoproterozoic mantle superplume beneath Rodinia?",
    abstract = "Geochemical and Nd-Hf isotopic data are reported for dolerite samples from the Neoproterozoic (755 Ma) Mundine Well dyke swarm in northwestern Australia. These dolerites are tholeiitic in composition, crystallised from a common parental magma. Although the dolerite magma underwent varying degrees of crustal contamination during ascent and emplacement, the uncontaminated parental melt possessed geochemical and Nd isotopic characteristics, such as Nb/La approximate to 1.5, Nb/Th approximate to 15, Nb/U approximate to 50, epsilon Nd(T) approximate to 5, and epsilon Hf(T) approximate to 9 (estimated by extrapolation from geochemical correlations), that closely resemble plume-derived ocean island basalts. These features are also similar to those of dolerite dykes of similar age from Seychelles and South China. We propose that these late Neoproterozoic mafic suites may have been generated by melting of a vast asthenospheric mantle superplume that developed beneath, and led to breakup of, the Rodinia supercontinent. (c) 2005 Elsevier B.V. All rights reserved.",
    author = "X-H. Li and Zheng-Xiang Li and Michael Wingate and S-L. Chung and Y. Liu and G-C. Lin and W-X. Li",
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    Geochemistry of the 755 Ma Mundine Well dyke swarm, northwestern Australia: Part of a Neoproterozoic mantle superplume beneath Rodinia? / Li, X-H.; Li, Zheng-Xiang; Wingate, Michael; Chung, S-L.; Liu, Y.; Lin, G-C.; Li, W-X.

    In: Precambrian Research, Vol. 146, No. 1-2, 2006, p. 1-15.

    Research output: Contribution to journalArticle

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    AU - Li, Zheng-Xiang

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    N2 - Geochemical and Nd-Hf isotopic data are reported for dolerite samples from the Neoproterozoic (755 Ma) Mundine Well dyke swarm in northwestern Australia. These dolerites are tholeiitic in composition, crystallised from a common parental magma. Although the dolerite magma underwent varying degrees of crustal contamination during ascent and emplacement, the uncontaminated parental melt possessed geochemical and Nd isotopic characteristics, such as Nb/La approximate to 1.5, Nb/Th approximate to 15, Nb/U approximate to 50, epsilon Nd(T) approximate to 5, and epsilon Hf(T) approximate to 9 (estimated by extrapolation from geochemical correlations), that closely resemble plume-derived ocean island basalts. These features are also similar to those of dolerite dykes of similar age from Seychelles and South China. We propose that these late Neoproterozoic mafic suites may have been generated by melting of a vast asthenospheric mantle superplume that developed beneath, and led to breakup of, the Rodinia supercontinent. (c) 2005 Elsevier B.V. All rights reserved.

    AB - Geochemical and Nd-Hf isotopic data are reported for dolerite samples from the Neoproterozoic (755 Ma) Mundine Well dyke swarm in northwestern Australia. These dolerites are tholeiitic in composition, crystallised from a common parental magma. Although the dolerite magma underwent varying degrees of crustal contamination during ascent and emplacement, the uncontaminated parental melt possessed geochemical and Nd isotopic characteristics, such as Nb/La approximate to 1.5, Nb/Th approximate to 15, Nb/U approximate to 50, epsilon Nd(T) approximate to 5, and epsilon Hf(T) approximate to 9 (estimated by extrapolation from geochemical correlations), that closely resemble plume-derived ocean island basalts. These features are also similar to those of dolerite dykes of similar age from Seychelles and South China. We propose that these late Neoproterozoic mafic suites may have been generated by melting of a vast asthenospheric mantle superplume that developed beneath, and led to breakup of, the Rodinia supercontinent. (c) 2005 Elsevier B.V. All rights reserved.

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