Multiple crust-mantle interactions for the destruction of the North China Craton: Geochemical an Sr-Nd-Pb-Hf isotopic evidence from the Longbaoshan alkaline complex

Tin-Guang Lan, Hong-Rui Fan, Fang-Fang Hu, Andrew Tomkins, Kui-Feng Yang, Yongsheng Liu

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    Abstract

    In situ zircon Ua Pb ages and Hf isotopic data, major and trace elements, and Sra NdaPb isotopic compositions are reported for the Longbaoshan alkaline intrusive complex in the western Shandong Province (Luxi Block), southeastern North China Craton. The Longbaoshan complex, which consists of quartz syenite, aegirinea?? augite syenite, hornblende syenite, monzonite, and syenodiorite, was emplaced at 129.4a131.7 Ma. The complex is characterized by high concentrations of SiO2, K2O+Na2O, Al2O3, LILEs (e.g., Sr and Ba), and LREEs, and low concentrations of CaO, Fe2O3, MgO, and HFSEs (e.g., Nb, Ta, P and Ti). The Sr, Nd, Pb, and Hf isotopic values of this complex are similar to the nearby mafic rocks, which were derived from EM2-type lithospheric mantle, indicating that the Longbaoshan complex was mainly derived from partial melting of the EM2 source. Combined with geochemical and isotopic features, the high Nb/Ta ratios (average 19.2) of the Longbaoshan complex suggest that the EM2 source was induced by modification of crust-derived melts, which were in equilibrium with rutile-bearing eclogite.
    Original languageEnglish
    Pages (from-to)87 - 106
    Number of pages20
    JournalLithos
    Volume122
    Issue number1-2
    DOIs
    Publication statusPublished - 2011

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