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    Neoproterozoic Bimodal Intrusive Complex in the Southwestern Tarim Block, Northwest China: Age, Geochemistry, and Implications for the Rifting of Rodinia

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    Fulltext not available
    Authors
    Zhang, C.
    Li, Zheng-Xiang
    Li, X.
    Ye, H.
    Wang, A.
    Guo, K.
    Date
    2006
    Type
    Journal Article
    
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    Citation
    Zhang, Chuan-lin and Li, Zheng-Xiang and Li, Xian-hua and Ye, Haimin and Wang, Aiguo and Guo, Kun-yi. 2006. Neoproterozoic Bimodal Intrusive Complex in the Southwestern Tarim Block, Northwest China: Age, Geochemistry, and Implications for the Rifting of Rodinia. International Geology Review 48: pp. 112-128.
    Source Title
    International Geology Review
    DOI
    10.2747/0020-6814.48.2.112
    ISSN
    00206814
    Faculty
    Department of Applied Geology
    Faculty of Science and Engineering
    WA School of Mines
    URI
    http://hdl.handle.net/20.500.11937/40868
    Collection
    • Curtin Research Publications
    Abstract

    We report here the first SHRIMP U-Pb zircon ages and bulk-rock geochemistry for a Neoproterozoicbimodal intrusive complex in the Tarim block and discuss the tectonic implications. The Kudiigneous complex (KIC) crystallized at 783 10 Ma. Granite and gabbro comingled, indicating thatthe intrusions were coeval. The granite displays: high total alkalis (Na2O + K2O = 8?11 wt%); highabundances of Zr, Nb, Y, and total REE; and strong LREE enrichment [(La/Yb)N = 9?59] with asignificant negative Eu anomaly (dEu = 0.17?0.44), characteristic of A-type granites. Furthermore,samples of the granite have homogeneous positive eNd(T) values of 1.4 to 2.1 and MesoproterozoicNd modal ages (~1.3 Ga). We thus interpret the granite as probably generated by partial melting ofthe regional Mesoproterozoic arc and/or back-arc crust. The KIC gabbro is geochemically similar tointraplate alkaline basalts, with trace elements and isotope compositions indicating an OIB-typemagma source, variably contaminated by continental crust. Field observations, petrology, andgeochemistry indicate that the KIC was a bimodal alkaline complex formed by mixing of these twomagma types of different origins in a continental rift, possibly related to a mantle superplumebeneath the Rodinian supercontinent.

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