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    Neoproterozoic ultramafic-mafic-carbonatite complex and granitoids in Quruqtagh of northeastern Tarim Block, western China: Geochronology, geochemistry and tectonic implications

    Access Status
    Fulltext not available
    Authors
    Zhang, C.
    Li, X.
    Li, Zheng-Xiang
    Lu, S.
    Ye, H.
    Li, H.
    Date
    2007
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhang, C. and Li, X. and Li, Z. and Lu, S. and Ye, H. and Li, H. 2007. Neoproterozoic ultramafic-mafic-carbonatite complex and granitoids in Quruqtagh of northeastern Tarim Block, western China: Geochronology, geochemistry and tectonic implications. Precambrian Research. 152: pp. 149-169.
    Source Title
    Precambrian Research
    DOI
    10.1016/j.precamres.2006.11.003
    ISSN
    03019268
    URI
    http://hdl.handle.net/20.500.11937/18547
    Collection
    • Curtin Research Publications
    Abstract

    U–Pb zircon and baddeleyite ages, and geochemical and Nd isotopic data, are reported for a ultramafic–mafic-carbonatite complex and granites in Quruqtagh of northeastern Tarim Block, NW China. The carbonatite and plagioclase-bearing pyroxenite from the Qiganbulake mafic–ultramafic-carbonatite ring complex (QMC), the Xingdi granodiorite and the Taiyangdao granite were emplaced at 810±6, 818±11, 820±10 and 795±10 Ma (95% confidence level), respectively. The QMC is composed of dunite, apatiteand/or feldspar-bearing pyroxenite, pyroxenite, phlogopitelite and carbonatite. Petrography, geochemistry and mineral chemistry suggest that the QMC rocks were generated by partial melting of a CO2-metasomatized mantle in a rifting environment. The Xingdi and Taiyangdao granitoids possess high LREE, Na2O/K2O, Sr/Y, (La/Yb)N ratios and low HREE and HFSE contents, similar to modern adakites. However, they have lower MgO (or Mg#), Cr and Ni contents and unradiogenic Nd isotopes (pronounced negative eNd(t) value of -12.7 to -17.3 and Neoarchaean Nd model ages) than slab-derived adakites. Thus, they were likely formed by partial melting of Neoarchaean mafic protoliths in the lower crust, leaving behind a granulite residue. The QMC and the granitoids in Quruqtagh constitute a bimodal intrusive suite in a Neoproterozoic continental rift setting, possibly related to mantle plume activities beneath the Rodinian supercontinent.

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