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    塔里木南缘元古代变质基性火山岩地球化学特征——古塔里木板块中元古代裂解的证据

    张传林 赵宇 郭坤一 董永观 王爱国

    张传林, 赵宇, 郭坤一, 董永观, 王爱国, 2003. 塔里木南缘元古代变质基性火山岩地球化学特征——古塔里木板块中元古代裂解的证据. 地球科学, 28(1): 47-53.
    引用本文: 张传林, 赵宇, 郭坤一, 董永观, 王爱国, 2003. 塔里木南缘元古代变质基性火山岩地球化学特征——古塔里木板块中元古代裂解的证据. 地球科学, 28(1): 47-53.
    ZHANG Chuan-lin, ZHAO Yu, GUO Kun-yi, DONG Yong-guan, WANG Ai-guo, 2003. Geochemistry Characteristics of the Proterozoic Meta-Basalt in Southern Tarim Plate: Evidence for the Meso-Proterozoic Breakup of Paleo-Tarim Plate. Earth Science, 28(1): 47-53.
    Citation: ZHANG Chuan-lin, ZHAO Yu, GUO Kun-yi, DONG Yong-guan, WANG Ai-guo, 2003. Geochemistry Characteristics of the Proterozoic Meta-Basalt in Southern Tarim Plate: Evidence for the Meso-Proterozoic Breakup of Paleo-Tarim Plate. Earth Science, 28(1): 47-53.

    塔里木南缘元古代变质基性火山岩地球化学特征——古塔里木板块中元古代裂解的证据

    基金项目: 

    中国地质调查局“中国前寒武纪重大地质问题研究” 200113900070

    “西昆仑成矿带成矿规律和找矿方向综合研究” 70401203200

    详细信息
      作者简介:

      张传林(1968-), 男, 助理研究员, 2000年毕业于南京大学, 获博士学位, 目前主要负责“西昆仑前寒武纪年代格架及东、西昆仑对比”课题.E-mail: zchuanlin@sina.com

    • 中图分类号: P59

    Geochemistry Characteristics of the Proterozoic Meta-Basalt in Southern Tarim Plate: Evidence for the Meso-Proterozoic Breakup of Paleo-Tarim Plate

    • 摘要: 超大陆裂解是当今地学研究最前沿课题.通过研究塔里木南缘铁克里克构造带前寒武纪变质火山岩的岩石化学特征、微量元素特征、稀土元素特征及Sm-Nd同位素特征, 探讨古塔里木板块的中元古代大陆裂解构造事件.该套变质火山岩组合下部以变质酸性火山岩(流纹岩夹部分晶屑凝灰岩)为主, 夹少量玄武岩, 上部为玄武岩夹少量条带状大理岩.基性火山岩w(SiO2)为42.34%~49.55%, w(Na2O+K2O)为2.63%~8.81%.下部玄武岩w(Na2O)/w(K2O)值为0.54~1.5, 为钾玄岩系列, 稀土总量高, 且轻稀土富集, 平均w(La)n/w(Yb)n值为3.45, δ(Eu)为0.69~0.91, 具弱至中等的Eu负异常, 微量元素具有碱性板内玄武岩特征; 上部玄武岩w(Na2O)/w(K2O)为5.11~17.89, 为拉斑系列, 轻重稀土没有明显分异, δ(Eu)在0.81~1.13之间, 基本没有Eu异常, w(La)n/w(Yb)n平均为1.69, 配分曲线与大洋拉斑玄武岩一致, 微量元素显示LILE(如Rb、Ba、Th)富集, HFSE与大洋拉斑玄武岩一致.岩石地球化学反映从早到晚由碱性-钙碱系列逐渐向拉斑系列演化.在上部玄武岩中获得(1 200± 82.3)Ma的Sm-Nd等时线年龄.认为该套变质火山岩记录了古塔里木板块在中元古代大陆裂解的构造过程.

       

    • 图  1  铁克里克构造带前寒武系火山岩分布

      Pt2.中元古宇; Pt2-3.中新元古宇; PZ2-MZ上古生界-中生界; 1.中元古代(双峰式)火山岩; 2.砂板岩; (1) 昆仑造山带; (2) 喀喇昆仑造山带; F1.塔里木南缘山前推覆断层; F2.康西瓦断裂; F3.喀喇昆仑断裂; F4.阿尔金断裂; 实心圈示下部玄武岩的取样位置, 空心圈示上部玄武岩的取样位置, 下同

      Fig.  1.  Sketch geological map of Tiekelike tectonic belt, western Kunlun

      图  2  硅碱图解[5] (a)、火山岩w(SiO2)-w(K2O+Na2O)分类图解[6] (b)

      A.副长石岩; B.苦橄(玄武)岩; C.碱玄岩; D.玄武岩; E.粗面玄武岩; F.玄武安山岩; G.玄武质粗面安山岩; H.响岩质玄武岩; I.粗面安山岩; J.安山岩

      Fig.  2.  w(SiO2)-alkaline (a), w(SiO2)-w(K2O+Na2O) (b) diagram of the volcanic rocks

      图  3  玄武岩w(A)-w(F)-w(M)图解(a)、火岩岩w(MnO)-w(TiO2)-w(P2O5)图解(b)

      OIT.大洋岛屿拉斑玄武岩; MORB.洋中脊玄武岩; IAT.岛弧拉斑玄武岩; OIA.大洋岛屿碱性玄武岩; CAB.钙碱性玄武岩

      Fig.  3.  Diagram of w(A)-w(F)-w(M) (a) and w(MnO)-w(TiO2)-w(P2O5) (b)

      图  4  玄武岩稀土元素(a)、微量元素N-MORB (b) 配分模式

      Fig.  4.  REE (a) and trance element (b) diagram of the basalt

      图  5  玄武岩w(Th)-w(Hf/3)-w(Ta)图解(a)、w(Th)-w(Hf/3)-w(Nb/16)图解(b)

      A.正常洋中脊玄武岩(N-MORB); B.富集型洋中脊玄武岩(P-MORB); B-C.板内玄武岩(WPB); D.岛弧拉斑玄武岩(IAT)

      Fig.  5.  w(Th)-w(Hf/3)-w(Ta) (a) and w(Th)-w(Hf/3)-w(Nb/16) (b) diagram of the basalt

      图  6  玄武岩Sm-Nd等时线

      Fig.  6.  Sm-Nd isochron of the basalt

      表  1  火山岩岩石化学成分

      Table  1.   Chemical composition of the Proterozoic volcanic rocks

      表  2  火山岩稀土元素分析成果

      Table  2.   REE composition of the volcanic rocks

      表  3  火山岩微量元素分析成果

      Table  3.   Trace element composition of the volcanic rocks

      表  4  玄武岩Sm-Nd同位素分析

      Table  4.   Sm-Nd isotope composition of the basalt

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    • 收稿日期:  2002-02-05
    • 刊出日期:  2003-01-25

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