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首页> 中文期刊>中国科学 >Sr-Nd-Pb isotopes of the Early Paleozoic mafic-ultramafic dykes and basalts from South Qinling belt and their implications for mantle composition

Sr-Nd-Pb isotopes of the Early Paleozoic mafic-ultramafic dykes and basalts from South Qinling belt and their implications for mantle composition

     
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摘要

Late Early Paleozoic mafic-ultramafic dykes and volcanic rocks from the South Qinling belt are characterized by eNd( t ) = +3.28―+5.02, (87Sr/86Sr)i＝0.70341―0.70555, (206Pb/204Pb)i = 17.256―18.993, (207Pb/204Pb)i= 15.505―15.642, (208Pb/204Pb)i=37.125―38.968, △8/4=21.18―774.43, △7/4＝8.11―18.82. These charac- teristics suggest that they derived from a Middle Neoproterozoic mantle with isotopic compositions of mixed HIMU, EMII and minor EMI components. We interpret that these rocks were melting products of depleted mantle modified by subducted ancient oceanic crust and continental margin sediments along the northern margin of Yangtze block during Early Neoproterozoic.

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  • 来源
    《中国科学》|2007年第9期|P.1293-1301|共9页
  • 作者

    ZHANG; ChengLi; GAO; Shan; YUAN; HongLin; ZHANG; GuoWei; YAN; YunXiang; LUO; JingLan; LUO; JinHai;

  • 作者单位

    State;

    Key;

    Laboratory;

    of;

    Continental;

    Dynamics,;

    Department;

    of;

    Geology,;

    Northwest;

    University,;

    Xi'an;

    710069,;

    China;

    State;

    Key;

    Laboratory;

    of;

    Geological;

    Progresses;

    and;

    Mineral;

    Resources,;

    China;

    University;

    of;

    Geosciences,;

    Wuhan;

    430074,;

    China;

    State;

    Key;

    Laboratory;

    of;

    Continental;

    Dynamics,;

    Department;

    of;

    Geology,;

    Northwest;

    University,;

    Xi'an;

    710069,;

    China;

    State;

    Key;

    Laboratory;

    of;

    Geological;

    Progresses;

    and;

    Mineral;

    Resources,;

    China;

    University;

    of;

    Geosciences,;

    Wuhan;

    430074,;

    China;

    State;

    Key;

    Laboratory;

    of;

    Continental;

    Dynamics,;

    Department;

    of;

    Geology,;

    Northwest;

    University,;

    Xi'an;

    710069,;

    China;

    State;

    Key;

    Laboratory;

    of;

    Continental;

    Dynamics,;

    Department;

    of;

    Geology,;

    Northwest;

    University,;

    Xi'an;

    710069,;

    China;

    State;

    Key;

    Laboratory;

    of;

    Continental;

    Dynamics,;

    Department;

    of;

    Geology,;

    Northwest;

    University,;

    Xi'an;

    710069,;

    China;

    State;

    Key;

    Laboratory;

    of;

    Continental;

    Dynamics,;

    Department;

    of;

    Geology,;

    Northwest;

    University,;

    Xi'an;

    7100;

  • 原文格式 PDF
  • 正文语种 CHI
  • 中图分类 自然科学总论;
  • 关键词

    mafic; dykes; and; basalts; from; South; Qinling; belt;

  • 入库时间 2024-01-27 13:19:16

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