Petrogenesis and tectonic significance of the Neoproterozoic Danba metabasalt in western Yangtze block

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    Petrology, geochemical and Nd isotopic data are reported for the Neoproterozoic Danba metabasalt in the Kangdian Rift on the western margin of the Yangtze block. Samples were collected from alkaline basalts, which are enriched in MgO, TiO2, with Mg# being 0.51~0.59. They have high total rare earth elements and show high fractionation between LREE and HREE. The trace elements are characterized obviously by enrichment of Th, Nb, Ta, Zr, Hf and LREE but depletion of Y and HREE. Their geochemical and Nd isotopic characteristics suggest that they are similar to OIB. The basaltic magma was generated in an intraplate setting, and was generated by partial melting of OIB mantle source region, with variable degrees of contamination of SCLM during magma ascending; in addition, some samples might have experienced contamination of the lower crust. These samples reveal some plume magmatism characteristics in petrochemistry, and imply that magmatism was probably related to the Neoproterozoic plume event, which resulted in the breakup of Rodinia supercontinent.

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林广春,2013,川西丹巴地区新元古代变质玄武岩成因及构造意义[J].岩石矿物学杂志,32(4):485~495. LIN Guang-chun,2013,Petrogenesis and tectonic significance of the Neoproterozoic Danba metabasalt in western Yangtze block[J]. Acta Petrologica et Mineralogica,32(4):485~495.

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  • Received:January 12,2013
  • Revised:May 28,2013
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