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    扬子克拉通峡东地区新元古代-寒武纪黑色岩系Os同位素地球化学特征及其地质意义

    王浩 凌文黎 段瑞春 杨红梅 陈子万 秦雅东

    王浩, 凌文黎, 段瑞春, 杨红梅, 陈子万, 秦雅东, 2012. 扬子克拉通峡东地区新元古代-寒武纪黑色岩系Os同位素地球化学特征及其地质意义. 地球科学, 37(3): 451-462. doi: 10.3799/dqkx.2012.052
    引用本文: 王浩, 凌文黎, 段瑞春, 杨红梅, 陈子万, 秦雅东, 2012. 扬子克拉通峡东地区新元古代-寒武纪黑色岩系Os同位素地球化学特征及其地质意义. 地球科学, 37(3): 451-462. doi: 10.3799/dqkx.2012.052
    WANG Hao, LING Wen-li, DUAN Rui-chun, YANG Hong-mei, CHEN Zi-wan, QIN Ya-dong, 2012. Os Isotopic Geochemistry of Neoproterozoic-Cambrian Black Shales in Eastern Three Gorges of Yangtze Craton and Its Geological Significance. Earth Science, 37(3): 451-462. doi: 10.3799/dqkx.2012.052
    Citation: WANG Hao, LING Wen-li, DUAN Rui-chun, YANG Hong-mei, CHEN Zi-wan, QIN Ya-dong, 2012. Os Isotopic Geochemistry of Neoproterozoic-Cambrian Black Shales in Eastern Three Gorges of Yangtze Craton and Its Geological Significance. Earth Science, 37(3): 451-462. doi: 10.3799/dqkx.2012.052

    扬子克拉通峡东地区新元古代-寒武纪黑色岩系Os同位素地球化学特征及其地质意义

    doi: 10.3799/dqkx.2012.052
    基金项目: 

    国土资源部公益性行业科研专项 200911043-19

    国家自然科学基金项目 40673025

    国家自然科学基金项目 40873017

    教育部长江三峡库区地质灾害研究中心研究项目 TGRC201027

    详细信息
      作者简介:

      王浩(1986-), 男, 博士研究生, 地球化学专业.E-mail: wanghaocug014051@163.com

      通讯作者:

      凌文黎, E-mail: wlling@cug.edu.cn

    • 中图分类号: P595

    Os Isotopic Geochemistry of Neoproterozoic-Cambrian Black Shales in Eastern Three Gorges of Yangtze Craton and Its Geological Significance

    • 摘要: 报道了扬子克拉通峡东地区新元古代至寒武纪含碳黑色泥质岩的Re-Os同位素和微量元素地球化学组成特征, 并对地层沉积环境的演化性质及其地质意义进行了讨论.研究表明: (1)峡东地区新元古代晚期-寒武纪早期细粒碎屑沉积岩Os同位素初始比值呈规律变化, 且具高Os同位素初始比值的层位与前人研究中发现的C同位素负漂移地层相对应; (2)南沱组冰碛岩具高放射成因Os同位素组成特征, 而其上覆盖帽碳酸盐岩为低放射成因Os同位素比值, 向上地层Os同位素初始比值表现为局部波动、总体增高的演化趋势; (3)微量元素U/Th比值与δU值指示莲沱组砂岩与南沱组冰碛岩具氧化环境的特征, 而陡山沱组、灯影组以及水井沱组底部黑色泥质岩则形成于相对还原环境; (4)Y/Ho比值和δCe值的负相关性特征指示部分地层沉积过程中有海底热液物质参与, 应为导致剖面上部分层位出现低放射性成因Os同位素组成的重要原因之一.高Os同位素比值和深海的脉冲式演化以及古生物群的产出之间很好的对应关系为探讨大陆风化与大气和海洋中氧气含量增加的联系提供了新的地球化学证据.南沱组冰碛岩Os同位素以及微量元素特征暗示其并非形成于完全冰封的地球表面环境, 而是存在较强的大陆岩石风化作用.

       

    • 图  1  峡东地区新元古代-寒武纪地层区域分布简图及剖面位置(据张永清等,2008)

      Fig.  1.  Geological sketch map of the eastern Three Gorges showing sampling profile location

      图  2  研究区新元古代-寒武纪地层采样位置示意(据Zhu, 2004)

      Fig.  2.  Stratigraphic column of the Neoproterozoic-Cambrian strata for the eastern Three Gorges and sampling positions

      图  3  Os同位素标样DTM的187Os/188Os比值测定结果

      Fig.  3.  Measured 187Os/188Os ratios for DTM standard

      图  4  秭归泗溪剖面新元古代晚期-寒武纪早期黑色岩系Re-Os含量关系

      Fig.  4.  Re-Os correlation plot for late Neoproterozoic-early Cambrian black shales from the eastern Three Gorges

      图  5  峡东地区新元古代-寒武纪剖面Os-C-Sr同位素初始比值变化示意

      C同位素数据来自Condon et al., 2005;Sr同位素数据来自Yang et al., 1999

      Fig.  5.  Variation trends of Os, C and Sr isotopes for the Neoproterozoic-Cambrian strata in the eastern Three Gorges

      图  6  峡东地区新元古代晚期-寒武纪早期细碎屑沉积岩氧化还原环境δU-U/Th判别

      Fig.  6.  U/Th-δU plot for the late Neoproterozoic-early Cambrian fine-grained sedimentary rocks from the eastern Three Gorges

      图  7  峡东地区新元代晚期-寒武纪早期细碎屑沉积岩Y/Ho-δCe(a)和δEu-δCe(b)关系

      Fig.  7.  Plots of δCe versus Y/Ho (a) and δEu (b) for the late Neoproterozoic-early Cambrian black shales from the eastern Three Gorges

      表  1  实验室标样XG26与ZG08-13的187Os/188Os比值分析结果及其与文献值对比

      Table  1.   187Os/188Os ratios of the in-house standard XG26 and sample ZG08-13 and comparison with literature

      序号 样号 岩性 187Os/188Os比值 文献来源
      1 XG26 橄榄岩 0.115 82±19 Yuan et al., 2007
      2 XG26 橄榄岩 0.114 84±27 同上
      3 XG26 橄榄岩 0.115 93±36 本文
      4 XG26 橄榄岩 0.115 89±8 本文
      5 XG26 橄榄岩 0.114 66±12 本文
      6 ZG08-13 碳质页岩 2.606 8±3 本文(CrO3-H2SO4溶液溶样)
      7 ZG08-13 碳质页岩 2.606 1±12 本文(反王水溶液溶样)
      下载: 导出CSV

      表  2  峡东泗溪剖面新元古代-寒武纪黑色岩系Re-Os同位素分析数据

      Table  2.   Re-Os isotopic compositions of the Neoproterozoic-Cambrian black shales from the Sixi profiles of the eastern Three Gorges

      样号 ZG08-9-2 ZG08-12 ZG08-13 ZG08-14-1 ZG08-14-2 ZG08-14-3 ZG08-14-4 ZG08-23-1 ZG08-23-2 ZG08-23-3 ZG08-24 ZG08-25 ZG08-29
      地层单元 水井沱组 灯影组 灯影组 陡山沱组 陡山沱组 陡山沱组 陡山沱组 陡山沱组 陡山沱组 陡山沱组 陡山沱组 南沱组 莲沱组
      岩性 黑色页岩 泥质灰岩 碳质页岩 黑色页岩 黑色页岩 沥青 黑色页岩 黑色页岩 黑色页岩 黑色页岩 泥质灰岩 冰碛岩 粉砂质泥质岩
      187Re/188Os 39.5 125.0 186.2 96.6 245.6 240.9 188.1 197.0 215.1 157.1 63.2 43.9 47.8
      187Os/188Os 1.155 0 1.822 8 2.606 1 1.705 0 3.066 0 3.441 5 2.360 5 2.860 4 2.695 4 2.032 6 1.065 2 1.233 5 0.885 3
      m 0.000 6 0.003 3 0.001 2 0.001 2 0.007 0 0.001 4 0.009 0 0.008 7 0.002 4 0.002 1 0.003 4 0.004 0 0.000 9
      Re/Os 7.23 21.24 29.19 16.62 36.84 34.90 30.23 30.14 33.44 26.10 11.69 7.96 9.02
      Re含量(ng/g) 2.49 0.43 21.03 7.90 5.07 12.46 2.57 5.34 6.77 7.29 0.28 0.09 0.10
      Os含量(ng/g) 0.344 0.020 0.721 0.475 0.137 0.357 0.085 0.177 0.202 0.279 0.024 0.011 0.011
      TMA(Ga) 1.56 0.81 0.80 0.98 0.72 0.82 0.71 0.83 0.71 0.73 0.89 1.51 0.95
      IOs 0.80 0.69 0.89 0.81 0.80 1.22 0.63 0.88 0.53 0.45 0.39 0.77 0.31
      注:①187Re/188Os比值据样品187Os/188Os比值及Re和Os含量计算获得;②187Os/188Os误差2σm为测量误差;③Re/Os为样品的Re、Os含量比;④TMA=1/λ*ln[((187Os/188Os)sample-(187Os/188Os)chond)/((187Re/188Os)sample-(187Re/188Os)chond)],(187Re/188Os)chond=0.401 86,(187Os/188Os)chond=0.127(Walker and Morgan, 1989);⑤IOs为样品的Os同位素初始比值,其计算公式为187Os/188Os-187Re/188Os×(eλt-1),λ=1.666×10-11a-1(Smoliar et al., 1996);莲沱组样品t取值为724 Ma(高维和张传恒,2009),南沱组样品t取值为635 Ma(Condon et al., 2005),陡山沱组样品t取值为635~551 Ma(Condon et al., 2005),灯影组上部样品t取值为542 Ma,下部样品t取值为551 Ma(Condon et al., 2005),寒武纪水井沱组样品t取值为535 Ma(Jiang et al., 2007).
      下载: 导出CSV

      表  3  峡东泗溪剖面新元古代-寒武纪黑色岩系微量元素组成(μg/g)

      Table  3.   Trace element compositions of the Neoproterozoic-Cambrian black shales from the Sixi profile of the eastern Three Gorges

      样号 ZG08-8 ZG08-9-2 ZG08-12 ZG08-13 ZG08-14-1 ZG08-14-2 ZG08-14-3 ZG08-14-4
      层位 水井沱组 水井沱组 灯影组 灯影组 陡山沱组 陡山沱组 陡山沱组 陡山沱组
      岩性 黑色页岩 黑色页岩 泥质灰岩 碳质页岩 黑色页岩 黑色页岩 沥青 黑色页岩
      Ni 85.4 31.9 3.06 5.76 50.6 16.3 42.9 23.0
      Y 30.9 51.5 1.49 11.1 44.0 33.0 76.7 14.3
      La 19.4 49.9 1.22 9.36 48.2 33.7 95.9 12.7
      Ce 25.3 53.2 1.02 11.2 65.6 31.9 99.5 21.2
      Pr 3.72 10.6 0.26 1.85 16.9 8.63 25.9 3.51
      Nd 14.8 43.6 1.06 6.94 77.1 38.3 115 14.3
      Sm 2.90 8.18 0.20 1.19 13.9 6.71 19.4 2.97
      Eu 0.64 1.63 0.057 0.24 2.02 1.40 3.63 0.65
      Gd 3.04 7.79 0.21 1.05 10.7 6.02 15.7 2.78
      Tb 0.46 1.12 0.036 0.18 1.35 0.84 2.08 0.42
      Dy 2.95 6.40 0.20 1.45 7.26 4.48 11.3 2.45
      Ho 0.72 1.35 0.043 0.38 1.39 0.91 2.25 0.50
      Er 2.09 3.59 0.10 1.34 3.67 2.35 5.79 1.34
      Tm 0.29 0.51 0.014 0.22 0.47 0.30 0.74 0.16
      Yb 1.82 2.68 0.076 1.63 2.80 1.51 4.20 1.07
      Lu 0.27 0.41 0.010 0.26 0.43 0.21 0.58 0.16
      Hf 1.57 3.03 0.032 1.44 2.67 1.22 2.52 1.48
      Ta 0.29 0.82 0.016 0.32 0.55 0.22 0.51 0.31
      Pb 7.34 10.9 0.65 3.01 18.8 4.98 16.9 6.37
      Th 3.65 8.33 0.075 2.50 7.54 2.39 7.24 2.47
      U 35.5 5.87 1.73 4.52 10.1 1.85 7.32 1.00
      Y/Ho 43.1 38.1 34.3 29.1 31.5 36.3 34.1 28.7
      U/Th 9.72 0.71 23.0 1.81 1.35 0.77 1.01 0.41
      δU 34.3 3.10 1.70 3.68 7.63 1.05 4.90 0.18
      ∑REE 78.4 191 4.50 37.3 252 137 402 64.2
      (La/Yb)N 7.54 13.2 11.3 4.06 12.2 15.8 16.1 8.44
      δCe 0.70 0.56 0.43 0.64 0.58 0.46 0.50 0.79
      δEu 0.63 0.59 0.81 0.62 0.47 0.64 0.59 0.66
      样号 ZG08-15 ZG08-23-1 ZG08-23-2 ZG08-23-3 ZG08-24 ZG08-25 ZG08-26 ZG08-29
      层位 陡山沱组 陡山沱组 陡山沱组 陡山沱组 陡山沱组 南沱组 莲沱组 莲沱组
      岩性 黑色页岩 黑色页岩 黑色页岩 黑色页岩 泥质灰岩 冰碛岩 长石石英砂岩 粉砂质泥岩
      Ni 36.3 39.9 40.5 44.3 3.08 21.4 1.73 13.4
      Y 25.2 20.8 22.3 28.5 1.90 29.7 16.2 46.8
      La 18.1 17.9 17.3 19.3 1.30 28.4 35.2 46.6
      Ce 27.5 28.1 27.2 28.9 1.13 56.2 57.9 91.4
      Pr 4.61 4.22 4.44 4.81 0.27 7.16 6.17 12.0
      Nd 19.3 17.1 18.5 20.6 1.25 27.5 21.9 47.5
      Sm 4.01 3.53 3.84 4.22 0.27 5.87 3.38 9.61
      Eu 0.97 0.89 0.95 1.07 0.055 1.14 0.81 2.49
      Gd 4.19 3.49 3.77 4.42 0.27 5.46 3.01 9.31
      Tb 0.63 0.55 0.56 0.67 0.038 0.89 0.44 1.42
      Dy 3.66 3.25 3.27 3.94 0.22 5.45 2.57 8.44
      Ho 0.77 0.67 0.70 0.81 0.045 1.13 0.53 1.68
      Er 2.04 1.83 1.89 2.23 0.13 3.20 1.50 4.61
      Tm 0.29 0.26 0.26 0.30 0.017 0.49 0.24 0.68
      Yb 1.60 1.62 1.58 1.74 0.10 3.16 1.59 4.46
      Lu 0.24 0.23 0.22 0.25 0.013 0.47 0.25 0.67
      Hf 2.03 2.04 1.92 1.42 0.033 4.93 2.93 7.37
      Ta 0.41 0.41 0.40 0.34 0.014 0.73 0.35 0.69
      Pb 6.73 6.65 5.92 4.88 0.52 11.1 12.8 15.0
      Th 3.13 2.92 2.94 2.54 0.096 8.83 4.04 7.73
      U 2.82 2.08 2.30 3.44 1.98 1.46 0.67 1.45
      Y/Ho 33.0 31.2 32.0 35.1 42.0 26.3 30.6 27.9
      U/Th 0.90 0.71 0.78 1.35 21.0 0.17 0.17 0.19
      δU 1.77 1.10 1.32 2.59 1.95 -1.49 -0.68 -1.13
      ∑REE 87.9 83.7 84.4 93.3 5.11 146 136 241
      (La/Yb)N 8.02 7.85 7.75 7.82 9.20 6.36 15.7 7.41
      δCe 0.74 0.79 0.77 0.74 0.46 0.97 0.91 0.95
      δEu 0.69 0.74 0.73 0.72 0.58 0.58 0.73 0.77
      注:①δU=U-Th/3;②∑REE表示为稀土元素总含量;③下标N代表球粒陨石标准化(Sun and McDonough, 1989);④δCe=2×CeN/(LaN+PrN);⑤δEu=2×EuN/(SmN+GdN).
      下载: 导出CSV
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    • 收稿日期:  2011-04-10
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