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    辽西晚古生代长茂河子辉绿岩墙群的地球化学特征

    李伍平 李献华

    李伍平, 李献华, 2005. 辽西晚古生代长茂河子辉绿岩墙群的地球化学特征. 地球科学, 30(6): 761-770.
    引用本文: 李伍平, 李献华, 2005. 辽西晚古生代长茂河子辉绿岩墙群的地球化学特征. 地球科学, 30(6): 761-770.
    LI Wu-ping, LI Xian-hua, 2005. Geochemical Characteristics of the Late Paleozoic Diabase Dyke Swarms of Chang maohezi from Western Liaoning, Northeast China. Earth Science, 30(6): 761-770.
    Citation: LI Wu-ping, LI Xian-hua, 2005. Geochemical Characteristics of the Late Paleozoic Diabase Dyke Swarms of Chang maohezi from Western Liaoning, Northeast China. Earth Science, 30(6): 761-770.

    辽西晚古生代长茂河子辉绿岩墙群的地球化学特征

    基金项目: 

    国家自然科学基金重点项目 40334039

    国家自然科学基金重点项目 40132020

    详细信息
      作者简介:

      李伍平(1963-), 男, 研究员, 主要从事火成岩、区域地质勘察和岩石地球化学研究. E-mail: wpli841@sohu.com

    • 中图分类号: P588.12

    Geochemical Characteristics of the Late Paleozoic Diabase Dyke Swarms of Chang maohezi from Western Liaoning, Northeast China

    • 摘要: 根据全岩K-Ar年龄(287.5~243.6Ma), 辽西朝阳长茂河子辉绿岩墙群形成于晚古生代.这些辉绿岩分为低铁钛辉绿岩和高铁钛辉绿岩2种, 以低铁钛辉绿岩为主.低铁钛辉绿岩以低TiO2(< 2%)、FeOt(12.39%~15.33%)、V(227~335μg/g)、Sc(24~36μg/g) 含量和高的SiO2 (45.61%~47.72%)、Al2O3(12.51%~16.71%)、MgO(6.66%~9.31%)、K2O(0.57%~2.39%)、Cr(107~177μg/g)和Ni(96~235μg/g) 含量, 以及低Ti/Y(327~496)和Ti/Zr (69~114) 比值为特征, 类似于大陆拉斑玄武质岩石; 高铁钛辉绿岩以高的TiO2 (5%~6%)、FeOt(22.13%~22.16%)、V(850~859μg/g)、Sc(51~52μg/g) 含量和低的SiO2 (42.88%~44.90%)、Al2O3(11.53%~11.57%)、MgO (5.15%~5.29%, Mg#=0.32)、K2O (0.48%~0.51%)、Cr(< 2μg/g)和Ni(< 30μg/g) 含量及高的Ti/Y(1046~1106)、Ti/Zr(250~263) 比值为特征, 类似于Skaergaard侵入体.这些辉绿岩相对富集Rb、Th、U、Pb、Ti和轻稀土元素, 而相对亏损Ba、Sr、P和Nb、Ta.εNd(t) (-6.43~-4.12)、εSr(t) (42.94~64.19) 显示Sr-Nd同位素组成较为均匀, 并反映它们源于富集岩石圈地幔.认为长茂河子辉绿岩形成于富集岩石圈地幔的部分熔融, 经历了岩浆结晶分异与地壳混染作用.高铁钛辉绿岩和低高铁钛辉绿岩形成环境不同, 前者形成于相对低氧逸度或相对封闭的结晶环境中.

       

    • 图  1  北票地区地质简图(据1∶20万地质图改编)

      图  2  Nb/Y- (Zr/TiO2) ×10-4关系图解

      Fig.  2.  Nb/Y vs. (Zr/TiO2) ×10-4 diagram

      图  3  稀土元素配分曲线型式和微量元素蛛网图(标准值采用Sun and McDonough, 1989推荐值, 图例同图 2)

      Fig.  3.  Chondrite-normalized REE distribution patterns and primary mantle-normalized incompatible element patterns

      图  4  辉绿岩SiO2与主微量元素相关图(图中符号同图 2)

      Fig.  4.  SiO2 vs. major and trace element diagrams

      图  5  Zr/Y-Zr关系图解(图例同图 2)

      Fig.  5.  Zr/Y vs. Zr diagram

      表  1  辉绿岩K-Ar年龄分析结果

      Table  1.   K-Ar ages of diabases

      表  2  辉绿岩主量和微量元素分析结果

      Table  2.   Major and trace element analysis of diabases

      表  3  辉绿岩Nd、Sr同位素分析结果

      Table  3.   Nd and Sr isotopic data of diabases

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    • 收稿日期:  2005-08-08
    • 刊出日期:  2005-11-25

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