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    湘西寒武纪早期黑色岩系中干酪根的稀土元素地球化学特征

    邓义楠 郭庆军 朱茂炎 张俊明

    邓义楠, 郭庆军, 朱茂炎, 张俊明, 2014. 湘西寒武纪早期黑色岩系中干酪根的稀土元素地球化学特征. 地球科学, 39(3): 283-292. doi: 10.3799/dqkx.2014.027
    引用本文: 邓义楠, 郭庆军, 朱茂炎, 张俊明, 2014. 湘西寒武纪早期黑色岩系中干酪根的稀土元素地球化学特征. 地球科学, 39(3): 283-292. doi: 10.3799/dqkx.2014.027
    Deng Yinan, Guo Qingjun, Zhu Maoyan, Zhang Junming, 2014. REE Geochemistry of Kerogen from Early Cambrian Black Rock Series in Western Hunan. Earth Science, 39(3): 283-292. doi: 10.3799/dqkx.2014.027
    Citation: Deng Yinan, Guo Qingjun, Zhu Maoyan, Zhang Junming, 2014. REE Geochemistry of Kerogen from Early Cambrian Black Rock Series in Western Hunan. Earth Science, 39(3): 283-292. doi: 10.3799/dqkx.2014.027

    湘西寒武纪早期黑色岩系中干酪根的稀土元素地球化学特征

    doi: 10.3799/dqkx.2014.027
    基金项目: 

    国家自然科学基金项目 40972023

    国家自然科学基金项目 40930211

    国家自然科学基金项目 40902003

    国家自然科学基金项目 41173008

    国家重点基础研究发展计划"973"项目 2013CB835004

    详细信息
      作者简介:

      邓义楠(1987-), 男, 硕士, 沉积学和地球化学专业.E-mail: dengyinan@126.com

      通讯作者:

      郭庆军, E-mail: guoqj@igsnrr.ac.cn

    • 中图分类号: P595

    REE Geochemistry of Kerogen from Early Cambrian Black Rock Series in Western Hunan

    • 摘要: 湘西寒武纪早期黑色岩系中富含源于上层海水生物体的有机质, 其稀土元素(REE)特征不被碎屑物质干扰, 能有效地反映海洋上层水体的古环境特征.样品中作为有机质主体的干酪根的重稀土富集、Ce负异常、Y正异常和Eu无明显异常等特点与现代海水一致, 其特征可能反映古海洋上层水体的氧化还原信息.扬子地台各相区沉积剖面底部可能出现滞流(或硫化)环境, 随后沉积环境逐渐氧化.全岩样品中Ce的负异常可能由有机质提供, Ce/Ce*值由剖面底部的较低值向上逐渐升高可能意味着海洋上层水体含氧量的逐渐上升, 而海水含氧量逐渐升高或许是由寒武纪早期海洋底部硫化环境的减弱所导致.

       

    • 图  1  湘西龙鼻嘴剖面和李家沱剖面位置和柱状图

      Fig.  1.  Location and column of Longbizui and Lijiatuo sections

      图  2  湘西寒武纪早期黑色岩系中有机质的REE的PAAS标准化配分曲线

      图 2f中海水表面和100 m分别为北大西洋表层和100 m深度海水的REE/PAAS标准化配分曲线(106)(Elderfield and Greaves, 1982)

      Fig.  2.  PAAS shale-normalized REE distribution spectra of organic matter from the Early Cambrian black rock series, western Hunan

      图  3  黑色岩系中有机质的稀土元素各参数的相关关系

      Fig.  3.  Cross plots of various REE parameters for organic matter in black rock series

      图  4  Ce在海洋中的变化特征及其在研究剖面的变化情况

      a.海洋氧化层和次氧化层上部水体Ce/Ce*值、Mn和氧气含量随深度的变化情况,修改自Slack et al.(2007)Ling et al.(2013).数据来源:Ce/Ce*值源于German et al.(1991),Mn微粒含量参考Lewis and Landing(1991),氧气浓度源于Luther et al.(1991)

      Fig.  4.  Variations of Ce/Ce* in the modern black sea and Longbizui and Lijiatuo section

      表  1  湘西龙鼻嘴剖面样品分析结果(10-6)

      Table  1.   Analytical results for samples from the Longbizui sections, western Hunan (10-6)

      样品号 岩性 厚度(m) La Ce Pr Nd Sm Eu Gd Tb Dy Y Ho Er Tm Yb Lu Ba ∑REE ∑LREE/∑HREE Ce/Ce* Eu/Eu* Y/Y* Ba/Nd
      LBZ563 磷质页岩 0.00 27.06 15.52 5.50 24.97 22.61 13.14 3.96 0.49 2.93 24.90 0.62 2.08 0.26 3.14 0.26 56 530.0 147.42 2.82 0.29 4.94 1.47 2 264.00
      LBZ564 磷质页岩 0.30 3.16 3.33 0.73 3.34 0.83 0.27 0.57 0.07 0.41 3.00 0.09 0.29 0.03 0.66 0.03 110.0 16.80 2.27 0.51 1.84 1.24 32.95
      LBZ566 硅质页岩 1.30 0.68 1.02 0.13 0.57 0.19 0.08 0.20 0.03 0.25 2.68 0.07 0.22 0.03 0.27 0.02 23.3 6.46 0.71 0.79 1.87 1.63 40.66
      LBZ568 黑色页岩 2.40 16.44 18.75 2.95 12.56 7.96 3.81 8.90 1.93 15.75 136.38 3.92 12.84 1.76 11.14 1.48 7 034.0 256.59 0.32 0.62 2.11 1.38 559.92
      LBZ569 黑色页岩 2.65 14.96 19.23 3.02 12.32 4.01 1.68 3.41 0.70 5.95 53.29 1.54 5.55 0.88 6.88 0.95 2 012.0 134.37 0.70 0.66 2.14 1.40 163.32
      LBZ570 黑色页岩 2.95 5.27 5.27 0.66 2.18 0.43 0.17 0.47 0.09 0.76 7.43 0.21 0.84 0.14 1.28 0.16 542.0 25.37 1.23 0.62 1.80 1.48 248.15
      LBZ574 硅质页岩 3.70 0.48 0.68 0.11 0.55 0.14 0.05 0.26 0.05 0.40 4.77 0.11 0.34 0.04 0.24 0.03 1.0 8.26 0.32 0.67 1.03 1.83 1.81
      LBZ577 磷质页岩 4.60 1.39 1.49 0.27 1.13 0.21 0.07 0.22 0.03 0.23 2.54 0.06 0.21 0.03 0.41 0.03 27.0 8.29 1.22 0.56 1.56 1.77 24.07
      LBZ580 黑色页岩 5.55 140.62 130.91 26.34 112.13 17.38 4.65 26.17 4.25 32.12 757.93 7.97 25.79 3.41 20.82 2.86 2 176.0 1 313.00 0.49 0.49 0.98 3.77 19.41
      LBZ581 黑色页岩 5.85 13.35 14.05 2.42 10.05 1.65 0.49 1.83 0.27 2.11 23.30 0.55 1.91 0.26 2.13 0.25 1 225.0 74.62 1.29 0.57 1.31 1.71 121.89
      LBZ583 黑色页岩 6.80 21.16 32.35 5.72 25.56 4.27 0.91 5.39 0.93 6.78 151.61 1.68 5.41 0.75 4.51 0.68 102.0 267.70 0.51 0.68 0.88 3.57 4.01
      LBZ584 黑色页岩 7.30 60.93 74.87 10.50 42.84 6.57 1.53 9.04 1.45 11.08 111.21 2.75 9.22 1.27 8.61 1.18 1 255.0 353.05 1.27 0.68 0.91 1.60 29.30
      LBZ586 黑色页岩 7.70 52.61 65.94 8.16 29.46 5.32 1.74 7.26 1.17 8.71 79.51 2.11 7.03 1.00 7.16 0.97 2 053.0 278.16 1.42 0.72 1.28 1.48 69.69
      LBZ588 黑色页岩 9.25 40.47 53.27 6.26 24.45 6.42 2.59 6.53 1.05 7.69 66.82 1.80 5.84 0.80 5.55 0.72 3 764.0 230.26 1.38 0.76 1.88 1.43 153.93
      LBZ591 黑色页岩 11.45 79.27 101.51 14.71 55.31 6.77 1.38 5.24 0.54 3.28 26.01 0.78 3.02 0.48 4.29 0.60 1 608.0 303.19 5.85 0.68 1.09 1.30 29.07
      LBZ598 黑色页岩 18.10 29.92 48.92 5.29 20.59 4.12 1.32 4.24 0.65 4.87 45.95 1.17 3.81 0.52 3.63 0.45 2 386.0 175.47 1.69 0.89 1.48 1.53 115.89
      LBZ605 黑色页岩 25.60 19.86 22.82 2.15 7.46 2.61 1.30 1.07 0.12 0.82 8.96 0.20 0.74 0.10 1.03 0.12 2 745.0 69.36 4.27 0.75 3.46 1.75 367.90
      LBZ612 黑色页岩 32.80 35.50 63.73 7.73 31.73 5.09 1.28 5.82 0.95 7.25 62.75 1.76 6.03 0.88 6.59 0.88 1 975.0 237.97 1.56 0.89 1.10 1.40 62.24
      LBZ616 黑色页岩 36.60 87.44 136.57 16.32 61.75 18.80 8.64 8.18 0.98 6.11 55.05 1.44 4.79 0.68 4.37 0.68 2 138.0 411.79 4.01 0.83 3.11 1.48 34.63
      LBZ621 黑色页岩 41.10 63.90 109.76 11.68 43.12 14.87 6.96 8.47 1.38 10.51 81.65 2.42 7.92 1.14 7.99 1.06 24 900.0 372.83 2.04 0.92 2.86 1.29 577.43
      下载: 导出CSV

      表  2  湘西李家沱剖面样品分析结果(10-6)

      Table  2.   Analytical results for samples from the Lijiatuo sections, western Hunan (10-6)

      样品号 岩性 厚度(m) La Ce Pr Nd Sm Eu Gd Tb Dy Y Ho Er Tm Yb Lu Ba ∑REE ∑LREE/∑HREE Ce/Ce* Eu/Eu* Y/Y* Ba/Nd
      Ljt550 磷质页岩 0.00 19.16 16.00 4.70 24.97 4.74 0.93 4.04 0.59 4.50 45.05 1.16 4.63 0.62 8.91 0.63 38.0 140.63 1.01 0.39 1.00 1.57 1.53
      Ljt551 硅质岩 0.60 46.44 31.25 9.12 43.97 7.60 1.43 8.07 1.22 8.93 91.62 2.24 7.80 1.06 9.97 1.03 49.0 271.75 1.06 0.35 0.85 1.63 1.12
      Ljt553 黑色页岩 2.20 128.37 89.11 19.76 73.57 8.70 1.61 6.40 0.80 6.18 57.76 1.66 6.62 1.06 9.39 1.27 3 196.0 412.27 3.52 0.40 1.01 1.43 43.44
      Ljt555 黑色页岩 4.20 82.18 85.44 12.06 38.91 8.63 3.87 5.12 0.76 5.65 53.10 1.43 5.86 0.89 10.86 1.01 21 330.0 315.76 2.73 0.61 2.70 1.48 548.14
      Ljt557 黑色页岩 6.50 43.66 43.29 7.76 31.56 7.51 2.82 3.72 0.54 3.99 32.34 1.00 3.87 0.60 5.42 0.66 13 320.0 188.73 2.62 0.54 2.43 1.29 422.12
      Ljt559 黑色页岩 8.90 71.38 85.73 13.54 53.93 11.38 3.99 7.94 1.40 11.29 96.99 2.89 10.79 1.66 14.33 1.70 16 100.0 388.95 1.61 0.63 1.97 1.35 298.56
      Ljt560 黑色页岩 9.20 287.41 435.93 61.33 279.37 81.99 25.49 177.17 31.27 245.00 1 833.00 61.73 208.68 30.14 199.43 29.67 1 300.0 3 988.00 0.42 0.76 0.89 1.18 4.65
      Ljt561 黑色页岩 9.50 143.27 434.11 27.56 100.30 24.74 10.95 11.13 1.64 11.98 93.41 2.94 10.87 1.73 13.05 1.90 46 900.0 889.58 4.98 1.59 2.96 1.25 467.62
      Ljt563 黑色页岩 14.80 237.53 856.32 51.36 193.25 25.53 5.77 19.13 2.64 18.45 134.46 4.27 15.61 2.25 23.41 2.34 10 840.0 1 592.30 6.15 1.79 1.23 1.21 56.09
      Ljt564 黑色页岩 16.30 172.37 242.63 32.90 116.28 28.90 12.47 16.90 2.77 20.40 187.14 5.09 17.63 2.76 18.41 2.88 27 830.0 879.54 2.21 0.74 2.61 1.46 239.33
      Ljt566 黑色页岩 20.60 91.78 147.12 22.24 92.99 16.76 4.68 12.92 2.27 17.38 129.77 4.06 14.37 2.04 20.30 1.99 12 640.0 580.65 1.83 0.75 1.49 1.23 135.92
      Ljt568 黑色页岩 25.00 29.91 37.46 5.23 22.70 10.88 4.61 10.44 2.11 16.17 123.13 3.81 13.37 1.85 19.09 1.76 14 990.0 302.52 0.58 0.68 2.03 1.25 660.45
      Ljt570 黑色页岩 28.40 47.03 59.16 9.00 38.91 11.17 3.87 12.05 2.29 16.90 134.09 3.94 14.46 1.91 26.04 1.84 7 596.0 382.68 0.79 0.66 1.56 1.31 195.22
      Ljt574 黑色页岩 35.40 58.88 46.02 9.57 35.27 4.05 0.82 4.17 0.57 4.04 51.30 1.10 4.09 0.64 4.41 0.70 473.0 225.64 2.18 0.44 0.93 1.92 13.40
      Ljt578 黑色页岩 38.95 5.02 4.73 0.84 3.74 1.53 0.53 2.02 0.42 3.58 36.09 0.99 4.03 0.61 7.02 0.67 1 504.0 71.82 0.30 0.53 1.40 1.51 401.93
      Ljt582 黑色页岩 51.95 4.98 6.72 0.87 3.69 0.94 0.29 1.86 0.36 2.79 29.11 0.69 2.43 0.33 3.72 0.30 9.0 59.09 0.42 0.74 0.95 1.67 2.45
      Ljt586 黑色页岩 64.85 19.94 20.47 2.95 11.82 1.94 0.43 2.46 0.37 2.69 28.28 0.67 2.52 0.32 4.10 0.31 40.0 99.27 1.38 0.60 0.90 1.68 3.36
      Ljt590 黑色页岩 78.95 98.89 134.32 26.15 129.06 24.32 3.29 11.97 1.15 7.83 80.64 1.95 7.79 1.03 14.11 1.09 439.0 543.59 3.26 0.61 0.88 1.64 3.40
      Ljt593 黑色页岩 97.95 76.25 97.70 13.53 58.13 9.84 1.67 7.41 0.72 4.48 38.95 1.05 4.01 0.57 6.77 0.59 205.0 321.68 3.98 0.70 0.92 1.43 3.53
      下载: 导出CSV
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