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    西藏吉隆盆地沃马剖面元素地球化学特征及环境指示意义

    邱海鸥 孙文 汤志勇 张克信 宋虎跃

    邱海鸥, 孙文, 汤志勇, 张克信, 宋虎跃, 2010. 西藏吉隆盆地沃马剖面元素地球化学特征及环境指示意义. 地球科学, 35(5): 789-802. doi: 10.3799/dqkx.2010.092
    引用本文: 邱海鸥, 孙文, 汤志勇, 张克信, 宋虎跃, 2010. 西藏吉隆盆地沃马剖面元素地球化学特征及环境指示意义. 地球科学, 35(5): 789-802. doi: 10.3799/dqkx.2010.092
    QIU Hai-ou, SUN Wen, TANG Zhi-yong, ZHANG Ke-xin, SONG Hu-yue, 2010. Geochemical Characteristics of the Oma Section in the Tibetan Gyirong Basin and Its Implications on Environment Change. Earth Science, 35(5): 789-802. doi: 10.3799/dqkx.2010.092
    Citation: QIU Hai-ou, SUN Wen, TANG Zhi-yong, ZHANG Ke-xin, SONG Hu-yue, 2010. Geochemical Characteristics of the Oma Section in the Tibetan Gyirong Basin and Its Implications on Environment Change. Earth Science, 35(5): 789-802. doi: 10.3799/dqkx.2010.092

    西藏吉隆盆地沃马剖面元素地球化学特征及环境指示意义

    doi: 10.3799/dqkx.2010.092
    基金项目: 

    中国地质调查局项目 1212010610103

    中国地质调查局项目 2006010028

    国家自然科学基金项目 40921062

    国家自然科学基金项目 40830212

    详细信息
      作者简介:

      邱海鸥(1963-), 女, 教授, 主要从事环境分析化学教学和科研工作.E-mail: qiuhaiou@cug.edu.cn

    • 中图分类号: X142

    Geochemical Characteristics of the Oma Section in the Tibetan Gyirong Basin and Its Implications on Environment Change

    • 摘要: 通过对西藏吉隆盆地沃马剖面上变价元素Fe、Mn的赋存形态分析, 根据变价元素不同赋存形态含量与古气候的关系, 探讨青藏高原隆升过程中的环境变迁历程.应用元素地球化学原理, 参考常规常量元素指标和测年资料, 确定了该剖面10.0~1.7 Ma来地球化学元素的分布规律.研究结果表明: 该剖面地层沉积时的地球化学环境历经强还原状态到弱氧化状态再到还原状态的变化过程, 其对应古气候呈现由干冷转向暖湿再到干冷的变化.

       

    • 图  1  研究区域地理位置

      Fig.  1.  Location of the study area

      图  2  TFe、TMn及其还原态含量随剖面高度变化曲线

      Fig.  2.  Variations of TFe, TMn and the reduce state of Fe and Mn with the depth of the section

      图  3  变价元素Fe、Mn氧化/还原形态比值曲线

      Fig.  3.  Variations of ratio Fe(Ⅲ)/Fe(Ⅱ) and Mn(OX)/Mn(Ⅱ)

      图  4  总铁(TFe)、总锰(TMn)及Fe(Ⅱ)、Mn(Ⅱ)衬度系数曲线

      Fig.  4.  Total concentrations of Fe, Mn and wealthy coefficient curves of Fe(Ⅱ), Mn(Ⅱ)

      图  5  Na2O、MgO、CaO含量随剖面高度变化曲线

      Fig.  5.  Content variation of Na2O, MgO and CaO with the depth of the section

      图  6  CaO、Na2O、K2O、MgO、Al2O3和SiO2构成的比值指标随剖面高度变化曲线

      Fig.  6.  Variations of ratio Na2O/K2O, CaO/MgO, SiO2/Al2O3 and (K2O+Na2O+CaO)/Al2O3 with the depth of the section

      图  7  K2O、Na2O、CaO和Al2O3衬度系数曲线

      Fig.  7.  Wealthy coefficient curves of K2O, Na2O, CaO, Al2O3

      表  1  吉隆沃玛剖面变价元素及其形态分布(%)

      Table  1.   Distribution of the valence-variable elements of the Oma section in the Gyirong basin

      分布 TFe Fe(Ⅱ) Fe(Ⅲ) TMn Mn(Ⅱ) Mn(OX)
      平均值 4.10 0.420 3.68 0.07 0.026 0 0.044 0
      极大值 22.84 1.090 22.62 0.36 0.087 0 0.320 0
      极小值 0.58 0.093 0.17 0.01 0.003 7 0.000 3
      变异系数 1.04 0.500 1.17 0.81 0.580 0 1.120 0
      下载: 导出CSV

      表  2  吉隆沃玛剖面常量元素分布(%)

      Table  2.   Distribution of common elements of the Oma section in the Gyirong basin

      分布 Na2O MgO Al2O3 SiO2 K2O CaO
      平均值 1.10 0.75 11.88 54.56 2.33 11.17
      极大值 1.91 1.62 18.27 75.62 4.68 47.69
      极小值 0.17 0.33 1.49 9.44 0.23 0.26
      变异系数 0.38 0.36 0.26 0.25 0.27 0.76
      下载: 导出CSV

      表  3  吉隆沃玛剖面变价元素及其构成指标分布特征

      Table  3.   Distribution of valence-variable element and its indicators of the Oma section in the Gyirong basin

      类别 指示指标 阶段 整个剖面
      年代(Ma) 约3.3~1.7 约6.7~3.3 约10.0~6.7 约1.7~10.0
      剖面高度(m) 602.9~420.0 420.0~265.0 265.0~12.3 602.9~12.3
      变价元素比值 Fe(Ⅲ)/Fe(Ⅱ) 范围 0.53~17.49 0.81~134.50 0.74~59.87 0.53~134.50
      均值 3.88 16.18 11.86 13.40
      Mn(OX)/Mn(Ⅱ) 范围 0.50~4.16 0.13~7.40 0.32~4.38 0.13~7.40
      均值 1.64 1.82 1.67 1.84
      变价元素衬度系数 Fe(Ⅱ) 范围 0.42~2.60 0.32~2.10 0.22~2.57 0.22~2.57
      均值 1.53 0.99 0.83 1.00
      Mn(Ⅱ) 范围 0.23~3.37 0.30~2.22 0.14~2.83 0.14~3.37
      均值 1.08 1.08 0.91 1.01
      变价元素绝对含量(%) TFe 范围 1.32~5.32 0.58~22.84 0.63~5.33 0.58~22.84
      均值 2.64 4.53 2.40 4.10
      Fe(Ⅱ) 范围 0.29~0.96 0.10~1.09 0.093~1.07 0.093~1.09
      均值 0.65 0.40 0.34 0.42
      Mn(Ⅱ) 范围 0.009 4~0.087 0 0.005 8~0.073 0 0.003 7~0.021 0 0.003 8~0.008 6
      均值 0.030 0.027 0.011 0.026
      下载: 导出CSV

      表  4  吉隆沃玛剖面常量元素及其构成指标分布特征

      Table  4.   Distribution of constant element and its indicators of the Oma section in the Gyirong basin

      类别 指示指标 阶段 整个剖面
      年代(Ma) 约3.3~1.7 约6.7~3.3 约10.0~6.7 约1.7~10.0
      剖面高度(m) 602.9~420.0 420.0~265.0 265.0~12.3 602.9~12.3
      常量元素比值 SiO2/Al2O3 范围 2.55~6.99 2.70~7.31 2.58~12.53 2.55~12.53
      均值 4.95 4.61 5.32 4.30
      CaO/MgO 范围 8.71~23.27 4.73~21.43 0.30~64.33 0.30~64.33
      均值 14.15 11.69 22.96 11.76
      (K2O+Na2O+CaO)/Al2O3 范围 0.80~2.62 0.58~1.69 0.20~29.23 0.20~29.23
      均值 1.46 0.94 3.94 0.96
      常量元素衬度系数 CaO 范围 0.37~1.92 0.36~1.55 0.02~4.27 0.02~4.27
      均值 1.14 0.75 1.39 0.74
      K2O 范围 0.81~1.45 0.61~2.01 0.10~1.42 0.10~2.01
      均值 1.13 1.03 0.88 0.94
      Al2O3 范围 0.75~1.32 0.72~1.54 0.13~1.42 0.13~1.54
      均值 0.97 1.08 0.86 0.93
      下载: 导出CSV
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