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    渝东北黑色页岩元素迁移特征及化学风化程度

    巫锡勇 凌斯祥 任勇 廖昕 赵思远 李晓宁

    巫锡勇, 凌斯祥, 任勇, 廖昕, 赵思远, 李晓宁, 2016. 渝东北黑色页岩元素迁移特征及化学风化程度. 地球科学, 41(2): 218-233. doi: 10.3799/dqkx.2016.017
    引用本文: 巫锡勇, 凌斯祥, 任勇, 廖昕, 赵思远, 李晓宁, 2016. 渝东北黑色页岩元素迁移特征及化学风化程度. 地球科学, 41(2): 218-233. doi: 10.3799/dqkx.2016.017
    Wu Xiyong, Ling Sixiang, Ren Yong, Liao Xin, Zhao Siyuan, Li Xiaoning, 2016. Elemental Migration Characteristics and Chemical Weathering Degree of Black Shale in Northeast Chongqing, China. Earth Science, 41(2): 218-233. doi: 10.3799/dqkx.2016.017
    Citation: Wu Xiyong, Ling Sixiang, Ren Yong, Liao Xin, Zhao Siyuan, Li Xiaoning, 2016. Elemental Migration Characteristics and Chemical Weathering Degree of Black Shale in Northeast Chongqing, China. Earth Science, 41(2): 218-233. doi: 10.3799/dqkx.2016.017

    渝东北黑色页岩元素迁移特征及化学风化程度

    doi: 10.3799/dqkx.2016.017
    基金项目: 

    轨道交通行业拔尖创新人才培育项目 No.2012-19

    四川省科技支撑计划项目 Nos.2012SZ0051

    国家自然科学基金项目 Nos.51348003

    国家自然科学基金项目 Nos.41472256

    国家自然科学基金项目 Nos.41172261

    国家自然科学基金项目 Nos.41502269

    西南交通大学博士创新基金项目 No.2015-40

    详细信息
      作者简介:

      巫锡勇 (1963-),男,教授,博士生导师.主要从事岩石风化及其工程特性评价、特殊岩土工程研究

      通讯作者:

      廖昕,E-mail: xinliao@swjtu.edu.cn

    • 中图分类号: P595;P642.5

    Elemental Migration Characteristics and Chemical Weathering Degree of Black Shale in Northeast Chongqing, China

    • 摘要: 黑色页岩是富含有机质和硫化矿物的特殊沉积岩,但人们对其风化过程的元素活动性及矿物风化机制关注较少.为探讨不同地形位置的黑色页岩化学风化过程,采集了渝东北城口某山脊 (A)、近山顶 (B) 和沟谷 (C) 的下寒武统水井沱组黑色页岩风化剖面岩样,利用XRD、XRF和化学分析手段对采集样品的矿物成分、主量元素进行测定分析.元素和矿物的质量迁移系数 (τ) 和质量迁移通量 (Mj, flux) 的计算结果表明,黑色页岩风化过程中Ca、Mg和Na元素具有明显的贫化现象,近地表处存在Al元素的富集现象;矿物成分方面,黄铁矿和有机质氧化后形成的酸性水环境,造成方解石、白云石、斜长石等不稳定矿物溶解,并生成含水石膏、铁质氧化物、黏土矿物等次生矿物.不同赋存位置的黑色页岩风化程度有所差异,Na/K-CIA、K/Ca*-Al/Na、A-CN-K和A-CNK-FM图解显示:A剖面处于脱Ca过程的初级风化阶段,B剖面处于脱Ca、Na初期的初等-中等风化阶段,C剖面已发生脱Ca、Na过程,并伴随脱Si作用的中等-强烈风化阶段,结合不同风化指数 (如:CIACIWPIAMWPI等),得出各剖面的化学风化强弱程度依次为C>B>A.

       

    • 图  1  城口下寒武统水井沱组黑色页岩采样位置地形图及剖面

      中国地图据中华人民共和国地图 (1:20 000 000),2014,星球地图出版社,北京

      Fig.  1.  Sampling location and profile photo of Shuijingtuo Formation black shale, Lower Cambrian at Chengkou County

      图  2  黑色页岩各剖面的主量元素在各深度处的质量迁移

      a.A剖面;b.B剖面;c.C剖面

      Fig.  2.  The τTi, j values plotted versus depth along three profiles for major elements

      图  3  黑色页岩各剖面矿物在不同深度的质量迁移

      a, b, c.A剖面;d, e, f.B剖面;g, h, i.C剖面

      Fig.  3.  τTi, j values plotted versus depth along three black shale weathering profiles for minerals

      图  4  城口黑色页岩化学风化CIA值与Na/K (a) 关系以及K/Ca*与Al/Na (b) 关系

      Fig.  4.  Relationships of CIA versus Na/K (a) and K/Ca* versus Al/Na (b) of black shale in Chengkou County

      图  5  城口黑色页岩化学风化趋势

      a.A-CN-K趋势图;b.A-CNK-FM趋势图;箭头指示化学风化趋势;A.Al2O3;CN.CaO*+Na2O;K.K2O;CNK.CaO*+Na2O+K2O;FM.TFe2O3+MgO

      Fig.  5.  Weathering trends for the Shuijingtuo Formation black shale at Chengkou County

      表  1  城口下寒武统黑色页岩各剖面矿物成分

      Table  1.   Mineral concentrations of black shales in all profiles at Chengkou County

      分层 序号 深度
      (m)
      石英
      (%)
      斜长石
      (%)
      方解石
      (%)
      白云石
      (%)
      伊利石
      (%)
      白云母
      (%)
      蒙脱石
      (%)
      磷灰石
      (%)
      石膏a
      (%)
      黄铁矿a
      (%)
      A-1 0.10 24.6 20.4 -- -- 23.5 31.2 -- -- 0.29 0.32
      风化层 A-2 0.25 27.5 24.4 -- -- 23.8 23.4 -- -- 0.46 0.85
      A-3 0.45 18.9 17.3 1.0 1.1 17.6 44.1 -- -- 0.81 0.59
      半风化层 A-4 0.55 27.5 24.8 -- -- 18.4 29.3 -- -- 1.83 0.57
      A-5 0.65 27.6 28.6 -- -- 20.5 21.8 -- -- 1.28 0.46
      A-6 0.75 26.1 32.1 -- -- 19.6 21.2 -- -- 1.16 0.72
      A-7 0.85 26.8 24.9 -- -- 20.1 16.4 -- -- 8.74 3.05
      A-8 1.10 18.4 14.2 2.4 2.5 12.4 41.2 -- -- 6.90 3.65
      过渡层 A-9 1.50 17.3 13.4 1.8 2.2 13.2 39.3 -- -- 5.15 6.42
      A-10 2.10 20.5 18.1 5.4 3.0 22.0 21.0 -- -- 2.81 6.35
      母岩 A-11 3.00 22.5 23.7 3.9 4.4 20.1 17.6 -- -- 0.13 7.16
      B-1 0.50 41.4 6.1 -- 2.0 40.9 -- 9.1 -- 0.50 0.36
      风化层 B-2 1.00 42.3 5.7 2.4 0.8 43.5 -- 6.0 -- 0.38 0.84
      B-3 1.50 40.6 5.4 2.0 -- 42.6 -- 7.5 -- 0.07 2.49
      半风化层 B-4 2.00 42.4 6.2 -- -- 38.3 10.2 3.6 -- 0.15 3.11
      B-5 2.50 24.7 5.8 -- -- 39.3 25.7 3.0 -- 0.19 1.54
      B-6 3.20 20.4 21.5 -- -- 26.7 30.5 -- -- 0.27 3.90
      B-7 4.00 24.6 17.3 4.0 1.3 25.1 25.6 -- -- 0.14 3.46
      B-8 4.80 13.7 24.1 1.4 1.9 16.5 31.2 3.3 -- 0.18 6.20
      过渡层 B-9 5.50 15.9 33.3 2.2 1.8 17.2 21.6 -- -- 0.14 6.22
      B-10 6.20 25.6 22.3 2.9 3.4 17.1 19.2 -- -- 0.07 6.81
      母岩 B-11 7.00 31.7 20.2 3.8 5.2 15.0 15.4 -- -- 0.04 8.88
      C-1 0.50 26.3 2.1 -- 7.8 12.3 52.8 -- -- 0.47 0.18
      风化层 C-2 1.00 30.8 2.3 -- -- 14.6 50.9 -- -- 0.41 0.58
      C-3 1.50 36.3 2.2 0.8 -- 13.3 47.4 -- -- 0.37 0.48
      C-4 2.00 35.3 2.3 -- -- 12.4 50.3 -- -- 0.64 1.05
      C-5 3.00 33.9 1.6 -- -- 16.5 46.2 -- -- 0.97 2.96
      半风化层 C-6 4.00 33.7 1.5 1.2 -- 18.8 38.5 -- -- 1.97 4.12
      C-7 5.00 32.4 1.3 2.0 -- 20.0 40.4 -- -- 1.08 3.43
      C-8 6.20 32.7 1.7 1.0 -- 14.4 44.2 -- -- 0.69 5.31
      过渡层 C-9 8.00 41.4 1.5 8.8 4.4 13.5 17.0 -- 8.4 0.48 4.32
      C-10 9.00 41.3 2.2 11.5 8.4 13.8 13.3 -- 3.5 0.04 5.99
      母岩 C-11 10.50 40.4 2.0 17.2 13.1 4.7 10.0 -- 5.5 0.12 5.32
      C-oxideb ? 18.5 -- -- -- 18.1 6.9 -- -- -- 0.19
      页岩碎片 SS-1 0.00 43.0 5.8 -- 9.6 19.8 18.1 -- -- 0.97 0.97
      SS-2 0.00 41.3 8.0 -- -- 21.2 19.5 10.0 -- 1.09 1.27
      SS-3 0.00 37.8 9.4 -- -- 20.1 12.7 4.0 -- 16.09 0.49
      SS-4 0.00 39.3 6.0 -- -- 15.0 18.4 8.9 -- 11.14 1.34
      注:“--”表示低于XRD的检测限,<0.5%;“?”表示C-oxide样品为未知分层;a.石膏和黄铁矿的百分含量分别由硫酸盐、二硫化物的含量来修正;b.C-oxide含有56.5%针铁矿,未在表中列出.
      下载: 导出CSV

      表  2  城口下寒武统黑色页岩主量元素和Ti元素百分比浓度及风化指标统计

      Table  2.   Concentrations of major elements and Ti, pH, chemical index values of black shale in profiles A, B, C, and SS at Chengkou County

      序号深度
      (m)
      ρ
      (g/cm3)
      SiO2
      (%)
      Al2O3
      (%)
      TFe2O3
      (%)
      K2O
      (%)
      Na2O
      (%)
      CaO
      (%)
      MgO
      (%)
      MnO
      (%)
      P2O5
      (%)
      BaO
      (%)
      SO3
      (%)
      LOI
      (%)
      bTi (10-6)dNa/KdK/Ca*dAl/NaεTi, wCIACIWPIAMWPIaICV
      A-10.101.5365.513.608.102.842.520.290.970.220.200.530.234.394 9701.3511.663.280.6363.7174.4369.257.281.20
      A-20.251.7965.713.707.782.872.630.280.960.050.250.470.304.415 2751.3912.203.170.3163.3073.9168.667.381.19
      A-30.451.7263.413.859.082.912.590.220.980.270.280.371.034.975 1381.3515.753.250.4063.9474.8269.667.481.23
      A-40.551.9269.814.601.353.132.740.191.090.010.030.281.105.695 2711.3319.613.240.2263.9275.0569.797.590.88
      A-50.651.9069.114.251.383.022.790.361.02BDL0.020.261.787.335 8181.409.993.100.1262.6073.1067.687.730.91
      A-60.751.9867.814.201.633.052.940.190.96BDL0.020.293.368.215 6571.4619.112.940.1062.6073.2667.777.730.91
      A-70.852.2262.613.353.972.932.561.581.200.020.090.467.268.565 3401.332.213.170.0456.5565.3358.969.821.26
      A-81.102.4255.711.704.932.512.285.942.160.050.170.328.3110.645 0171.381.453.120.0253.3860.9354.4912.541.68
      A-91.502.5049.610.6012.062.361.945.051.720.040.140.288.7011.064 7671.251.603.320.0454.2562.4255.7611.482.05
      A-102.102.6157.211.104.452.412.086.791.720.050.150.377.7510.944 8591.311.523.24-0.0254.0161.8655.3711.061.57
      A-113.002.6552.311.759.932.632.223.802.490.050.180.336.2510.764 6701.281.563.220.0053.6561.6754.9313.342.01
      B-10.501.6769.79.853.922.060.663.481.200.021.341.020.405.023 5420.494.119.070.3469.1281.9477.825.391.08
      B-21.001.9069.96.982.871.620.563.650.940.010.600.650.268.802 4860.533.817.580.6766.0079.1273.944.481.18
      B-31.501.8867.48.763.492.090.422.851.300.020.651.600.7011.703 2340.316.5512.680.3070.6286.3782.465.241.11
      B-42.001.7574.79.343.502.161.410.660.86BDL0.150.480.335.914 3550.993.904.030.0461.4672.6366.555.491.16
      B-52.501.8267.211.753.722.800.550.771.520.010.171.660.868.093 8340.306.7012.990.1370.8286.6582.816.351.00
      B-63.201.7266.012.105.942.801.960.121.030.010.120.418.248.884 2751.0627.783.750.0865.1577.8572.496.631.13
      B-74.001.9860.810.253.552.511.295.761.700.030.170.955.9310.113 7640.782.564.830.0659.5570.7263.968.871.39
      B-84.802.1459.713.004.423.111.843.742.040.030.200.527.009.014 9160.902.224.29-0.2457.9868.2361.4111.071.41
      B-95.502.2159.413.354.133.062.013.562.090.030.200.466.479.015 0101.002.004.04-0.2857.3666.8760.2811.521.40
      B-106.202.3859.713.354.133.012.294.001.940.040.190.505.838.374 8861.161.733.54-0.3255.3063.9257.2511.801.44
      B-117.002.5066.08.773.362.121.724.301.290.020.170.375.349.303 1671.231.623.100.0052.4460.7853.3610.361.59
      C-10.501.5665.515.302.732.870.232.732.030.220.790.200.188.996 3450.1216.4240.44-0.4479.8495.2994.165.550.79
      C-21.001.4970.516.601.333.190.300.310.740.020.040.830.305.015 6110.1413.9933.64-0.3478.9094.3993.024.400.50
      C-31.501.3569.816.700.873.380.230.410.770.010.030.590.185.845 6930.1019.3444.14-0.2979.0995.6794.524.480.48
      C-42.001.4368.717.501.483.550.210.310.860.010.040.550.165.425 6890.0922.2550.66-0.3279.4296.2095.184.730.50
      C-53.001.5763.915.854.823.280.200.370.770.010.040.614.169.266 3290.0921.5848.17-0.4879.8297.2096.424.610.63
      C-64.001.7960.515.206.733.080.200.631.020.140.140.635.2510.604 8670.1020.2746.20-0.3779.2095.8594.755.100.79
      C-75.001.7158.814.207.092.810.180.941.180.300.100.796.0010.454 6430.1020.5447.95-0.3079.6296.0094.965.230.87
      C-86.201.8656.914.859.913.020.200.350.780.030.080.466.1011.614 6270.1019.8745.13-0.3679.0995.7694.624.770.89
      C-98.001.9055.36.872.461.790.176.801.300.023.900.464.0713.895 0550.1413.8624.57-0.4273.3492.4789.825.351.14
      C-109.002.4553.66.452.711.660.188.001.840.021.740.354.1817.532 8310.1612.1421.78-0.2072.9791.5988.716.631.44
      C-1110.502.7449.14.512.941.160.1913.52.600.012.900.352.7719.322 0020.258.0314.430.0070.5787.8383.898.622.36
      C-oxide?1.5626.59.6048.451.100.010.060.760.010.350.360.4211.603 7550.01144.76583.56-0.4488.7099.6699.613.54
      SS-1052.810.106.481.410.484.133.080.070.710.374.4115.495 9510.523.8712.7976.4886.4884.459.501.60
      SS-2045.18.4722.181.300.791.040.820.032.151.502.7615.215 5080.922.176.5267.8976.5273.105.782.51
      SS-3060.29.776.492.421.085.450.760.040.180.125.457.043 9350.682.955.5061.2873.3366.806.521.32
      SS-4055.412.606.242.790.654.010.990.020.161.109.288.775 2010.355.6511.7870.9585.4981.756.481.00
      UCC66.015.205.003.403.904.202.200.060.50c0.501.741.152.3747.9354.2247.3114.481.70
      PAAS62.818.907.223.701.201.302.200.111.00c0.160.494.069.5770.3882.7279.059.410.97
      ES57.913.807.732.500.9512.952.130.300.89c0.750.583.468.8370.2981.5378.028.751.24
      NASC62.617.096.263.492.323.853.000.120.27c0.911.011.984.4859.9669.1363.5612.981.41
      注:各风化剖面的分层情况如表 1所示.UCC为上陆壳,PAAS为澳大利亚后太古代平均页岩,数据来自于Taylor and McLennan (1985);ES为欧洲平均页岩,NASC为北美平均页岩,数据分别来自于Gromet et al.(1984)MecLennan (1993).BDL表示低于检测限:<0.01%.LOI表示为烧失量.a表示ICV=[(Fe2O3+K2O+Na2O+CaO*+MgO+MnO+TiO2)/Al2O3],运用各氧化物摩尔分数计算,CaO*只包括硅酸盐矿物中的Ca,计算原则来源于Cox et al.(1995).b表示Ti元素运用电感耦合等离子体质谱法 (ICP-MS) 进行测试.c表示UCC、PAAS、ES及NASC的Ti元素的单位为百分含量 (%).d表示Na/K,K/Ca*和Al/Na比值都为分子摩尔比.
      下载: 导出CSV

      表  3  城口黑色页岩各剖面质量迁移系数 (τTi, j) 分布

      Table  3.   The τTi, j values of major elements of black shale in profiles A, B, and C at Chengkou County

      分层 序号 深度 (m) τTi, j
      Si Al Fe K Na Ca Mg P S LOI
      A-1 0.10 0.18 0.09 -0.23 0.01 0.07 -0.93 -0.63 0.04 -0.97 -0.62
      风化层 A-2 0.25 0.11 0.03 -0.31 -0.03 0.05 -0.93 -0.66 0.23 -0.96 -0.64
      A-3 0.45 0.10 0.07 -0.17 0.01 0.06 -0.95 -0.64 0.41 -0.85 -0.58
      半风化层 A-4 0.55 0.18 0.10 -0.88 0.05 0.09 -0.96 -0.61 -0.85 -0.84 -0.53
      A-5 0.65 0.06 -0.03 -0.89 -0.08 0.01 -0.92 -0.67 -0.91 -0.77 -0.45
      A-6 0.75 0.07 0.00 -0.86 -0.04 0.09 -0.96 -0.68 -0.91 -0.56 -0.37
      A-7 0.85 0.05 -0.01 -0.65 -0.03 0.01 -0.64 -0.58 -0.56 0.02 -0.30
      A-8 1.10 -0.01 -0.07 -0.54 -0.11 -0.04 0.46 -0.19 -0.12 0.24 -0.08
      过渡层 A-9 1.50 -0.07 -0.12 0.19 -0.12 -0.14 0.30 -0.32 -0.24 0.36 0.01
      A-10 2.10 0.05 -0.09 -0.57 -0.12 -0.10 0.72 -0.34 -0.20 0.19 -0.02
      母岩 A-11 3.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      B-1 0.50 -0.06 0.00 0.04 -0.13 -0.66 -0.28 -0.17 6.05 -0.93 -0.52
      风化层 B-2 1.00 0.35 0.01 0.09 -0.03 -0.59 0.08 -0.07 3.50 -0.94 0.21
      B-3 1.50 0.00 -0.02 0.02 -0.03 -0.76 -0.35 -0.01 2.74 -0.87 0.23
      半风化层 B-4 2.00 -0.18 -0.23 -0.24 -0.26 -0.40 -0.89 -0.52 -0.36 -0.96 -0.54
      B-5 2.50 -0.16 0.11 -0.09 0.09 -0.74 -0.85 -0.03 -0.17 -0.87 -0.28
      B-6 3.20 -0.26 0.02 0.31 -0.02 -0.16 -0.98 -0.41 -0.48 0.14 -0.29
      B-7 4.00 -0.22 -0.02 -0.11 0.00 -0.37 0.13 0.11 -0.16 -0.07 -0.09
      B-8 4.80 -0.42 -0.05 -0.15 -0.05 -0.31 -0.44 0.02 -0.24 -0.16 -0.38
      过渡层 B-9 5.50 -0.43 -0.04 -0.22 -0.09 -0.26 -0.48 0.02 -0.26 -0.23 -0.39
      B-10 6.20 -0.41 -0.01 -0.20 -0.08 -0.14 -0.40 -0.03 -0.28 -0.29 -0.42
      母岩 B-11 7.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      C-1 0.50 -0.58 0.07 -0.71 -0.22 -0.62 -0.94 -0.75 -0.91 -0.98 -0.85
      风化层 C-2 1.00 -0.49 0.31 -0.84 -0.02 -0.44 -0.99 -0.90 -1.00 -0.96 -0.91
      C-3 1.50 -0.50 0.30 -0.90 0.02 -0.57 -0.99 -0.90 -1.00 -0.98 -0.89
      C-4 2.00 -0.51 0.37 -0.82 0.08 -0.61 -0.99 -0.88 -1.00 -0.98 -0.90
      C-5 3.00 -0.59 0.11 -0.48 -0.11 -0.67 -0.99 -0.91 -1.00 -0.53 -0.85
      半风化层 C-6 4.00 -0.49 0.39 -0.06 0.09 -0.57 -0.98 -0.84 -0.98 -0.22 -0.77
      C-7 5.00 -0.48 0.36 0.04 0.04 -0.59 -0.97 -0.80 -0.99 -0.07 -0.77
      C-8 6.20 -0.50 0.42 0.46 0.13 -0.54 -0.99 -0.87 -0.99 -0.05 -0.74
      过渡层 C-9 8.00 -0.55 -0.40 -0.67 -0.39 -0.65 -0.76 -0.80 -0.47 -0.42 -0.72
      C-10 9.00 -0.23 0.01 -0.35 0.01 -0.33 -0.53 -0.50 -0.50 0.07 -0.36
      母岩 C-11 10.50 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
      C-oxide ? -0.71 0.13 7.78 -0.49 -0.97 -1.00 -0.84 -0.94 -0.92 -0.68
      下载: 导出CSV

      表  4  黑色页岩风化剖面中主量元素质量迁移通量 (mol/m2) 计算

      Table  4.   Mass fluxes (mol/m2) of major elements in three black shale weathering profiles

      剖面 分层 深度 (m) Si Al Fe K Na Ca Mg
      A剖面 风化层 0~0.55 501 64 -105 0 14 -709 -215
      半风化层 0.55~1.50 118 -74 -503 -44 -17 -144 -361
      过渡层 1.50~3.00 194 -167 -433 -78 -82 815 -349
      总计 0~3.00 813 -177 -1 041 -122 -85 -38 -925
      B剖面 风化层 0~2.00 -723 -65 -1 -84 -506 -762 -129
      半风化层 2.00~4.80 -8 750 -19 -17 -22 -536 -1 984 -155
      过渡层 4.80~7.00 -13 312 -91 -180 -90 -280 -1 483 -1
      总计 0~7.00 -22 785 -175 -198 -196 -1 322 -4 229 -285
      C剖面 风化层 0~2.00 -12 812 361 -892 -109 -121 -14 834 -2 822
      半风化层 2.00~8.00 -39 617 1 356 -511 -51 -363 -43 494 -8 807
      过渡层 8.00~10.50 -6 937 -184 -383 -78 -64 -6 811 -1 521
      总计 0~10.50 -59 366 1 533 -1 786 -238 -548 -65 139 -13 150
      下载: 导出CSV

      表  5  各种风化指标表达式

      Table  5.   Summary of weathering indices evaluated in this study

      指标 计算公式 参考来源
      CIA [Al2O3/(Al2O3+CaO*+Na2O+K2O)]×100 Nesbitt and Young (1982, 1984)
      CIW [Al2O3/(Al2O3+CaO*+Na2O)]×100 Harnois (1988)
      PIA [(Al2O3-K2O)/ (Al2O3+CaO*+Na2O-K2O)]×100 Fedo et al.(1995)
      MWPI [(Na2O+K2O+CaO*+MgO)/(Na2O+K2O+CaO*+MgO+SiO2+Al2O3+Fe2O3)]×100 Vogel (1975)
      注:上述各风化指标均运用氧化物的分子摩尔数计算,CaO*为硅酸盐矿物中的摩尔含量,不包括碳酸盐和磷酸盐矿物中的CaO含量;由于硅酸盐中的CaO与Na2O通常以1:1的摩尔比例存在,所以当CaO的摩尔数大于Na2O时,CaO*的分子摩尔等于Na2O的分子摩尔,而小于Na2O时则有mCaO*=mCaO(McLennan, 1993).
      下载: 导出CSV
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