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    丰宁黄土-古土壤剖面常量元素地球化学特征

    毛欣 刘林敬 李长安 张玉芬 赵红梅 毕志伟 姜高磊

    毛欣, 刘林敬, 李长安, 张玉芬, 赵红梅, 毕志伟, 姜高磊, 2017. 丰宁黄土-古土壤剖面常量元素地球化学特征. 地球科学, 42(10): 1750-1759. doi: 10.3799/dqkx.2017.538
    引用本文: 毛欣, 刘林敬, 李长安, 张玉芬, 赵红梅, 毕志伟, 姜高磊, 2017. 丰宁黄土-古土壤剖面常量元素地球化学特征. 地球科学, 42(10): 1750-1759. doi: 10.3799/dqkx.2017.538
    Mao Xin, Liu Linjing, Li Chang'an, Zhang Yufen, Zhao Hongmei, Bi Zhiwei, Jiang Gaolei, 2017. Elemental Composition Features of Loess-Paleosol Profile in Fengning, Hebei Province. Earth Science, 42(10): 1750-1759. doi: 10.3799/dqkx.2017.538
    Citation: Mao Xin, Liu Linjing, Li Chang'an, Zhang Yufen, Zhao Hongmei, Bi Zhiwei, Jiang Gaolei, 2017. Elemental Composition Features of Loess-Paleosol Profile in Fengning, Hebei Province. Earth Science, 42(10): 1750-1759. doi: 10.3799/dqkx.2017.538

    丰宁黄土-古土壤剖面常量元素地球化学特征

    doi: 10.3799/dqkx.2017.538
    基金项目: 

    中国地质科学院基本科研业务费专项 YWF201411

    国家自然科学基金项目 41602194

    详细信息
      作者简介:

      毛欣(1989-),男,研究实习员,主要从事第四纪环境演变方面的研究

      通讯作者:

      李长安

    • 中图分类号: P595

    Elemental Composition Features of Loess-Paleosol Profile in Fengning, Hebei Province

    • 摘要: 丰宁滦河上游的河谷地带有多处黄土堆积,由于该地区黄土分布零星、厚度较小,在以往的研究中却很少引起人们的关注,然而该地区黄土堆积是河北坝上地区环境演化和气候变化的重要地质记录.为了探讨该地区黄土的成因、物源以及化学风化强度,选取代表性的黄土-古土壤剖面77个样品进行了常量元素分析,并与已知典型风成堆积物的地球化学元素特征进行对比.结果表明:(1) 丰宁剖面的主要常量元素(SiO2、Al2O3和Fe2O3)之和以及UCC(Upper Continental Crust)标准化曲线均与典型风成堆积物具有较好的相似性, 表明丰宁黄土和古土壤为风成成因;(2) 丰宁黄土处于初等化学风化阶段,古土壤则进入了中等化学风化阶段.与典型风成堆积物相比,化学风化强度序列为:宣城风成红土>>西峰红黏土、镇江下蜀土>丰宁古土壤、洛川古土壤>洛川黄土>丰宁黄土;(3) 常量元素迁移特征表明丰宁黄土和古土壤的化学风化已完成了早期去Na、Ca阶段,并进入到了中期去K阶段;(4) 丰宁黄土、古土壤的K2O/Al2O3和Fe2O3/Al2O3比值与洛川黄土、洛川古土壤、镇江下蜀土、西峰红黏土较为接近,表明这些风成堆积物可能具有相似的源区.而TiO2/Al2O3比值小于其他风成堆积物, 指示丰宁剖面具有其他物源.

       

    • 图  1  丰宁剖面地理位置(a)和地貌位置(b)

      Fig.  1.  egional location (a) and geomorphic location (b) of the Fengning profile

      图  2  丰宁剖面磁化率曲线(c)与洛川黄土磁化率(a)、深海氧同位素曲线(b)的对比

      图a据Heller and Liu(1982);图b据Martinson et al.(1987);图c中蓝色和红色曲线分别代表低频磁化率Xlf和高频磁化率Xhf

      Fig.  2.  The variations of magnetic susceptibility in the Fengning profile (c) compared with that of loess in Luochuan (a) and the δ18O from SPECMAP (b)

      图  3  丰宁黄土和古土壤及其与其他风成堆积物常量元素的UCC标准化曲线分布模式

      图 3数据来源同表 2

      Fig.  3.  UCC-normalized pattern of elements of the Fengning profile and other aeolian dust deposits

      图  4  丰宁黄土和古土壤及其与其他风成堆积物的化学风化参数CIA、Na/K关系散点图(a)、丰宁剖面CIA、Na/K曲线变化特征(b)

      图 4数据来源同表 2

      Fig.  4.  Scatter diagram of CIA vs. Na/K molar ratio of the Fengning profile and other aeolian dust deposits (a), and variation of CIA and Na/K in Fengning profile (b)

      图  5  丰宁黄土和古土壤及其与其他风成堆积物的A-CN-K化学风化趋势

      图 5数据来源同表 2;A=Al2O3; CN=CaO*+Na2O; K=K2O

      Fig.  5.  CN-K ternary diagram of the Fengning profile and other aeolian dust deposits

      图  6  丰宁剖面常量元素相对于Al元素的迁移率

      Fig.  6.  Migration ratio of elements of the Fengning profile

      图  7  丰宁黄土和古土壤及其与其他风成堆积物的K2O/Al2O3、TiO2/ Al2O3和Fe2O3/ Al2O3比值散点图

      Fig.  7.  Scatter diagram of K2O/Al2O3、TiO2/ Al2O3 and Fe2O3/ Al2O3 molar ratio of the Fengning profile and other aeolian deposits

      表  1  丰宁剖面光释光(OSL)测年结果

      Table  1.   Optically Stimulated Luminescence (OSL) dating in the Fengning profile

      样品编号 埋深(m) U(10-6) Th(10-6) K(%) ED(Gy) Dy(Gy/ka) 含水量(%) 年龄(ka)
      FN1-1 1.18 1.71 8.92 1.84 192.36±7.02 3.25±0.13 16.44 59.2±3.2
      FN1-2 2.36 1.52 8.00 1.94 203.51±2.36 3.31±0.13 9.33 61.5±2.6
      FN1-3 3.15 1.75 8.35 1.97 255.48±8.61 3.38±0.14 11.81 75.5±4.0
      FN1-4 4.10 2.21 11.51 2.03 305.14±9.30 3.79±0.15 15.47 80.5±4.0
      FN2-4 8.21 1.67 8.73 2.08 787.34±13.73 3.45±0.14 11.61 228.3±10.0
        注:ED为等效剂量(equivalent dosimeter);Dy为年剂量(yearly dosimeter).
      下载: 导出CSV

      表  2  丰宁黄土和古土壤常量元素含量(%)及其与其他风成堆积物的比较

      Table  2.   The element contents (%) of the Fengning profile and other aeolian dust deposits

      采样位置 SiO2 Al2O3 Fe2O3 K2O Na2O CaO MgO MnO TiO2 P2O5 CIA
      丰宁黄土n=63 最大值 64.38 14.05 5.41 2.54 1.88 9.46 2.40 0.07 0.43 0.06 67.34
      最小值 45.99 9.67 3.52 1.96 1.25 1.02 1.46 0.04 0.31 0.02 53.59
      平均值 54.33 11.79 4.46 2.23 1.55 4.90 1.96 0.06 0.36 0.04 61.00
      丰宁古土壤n=14 最大值 61.39 14.77 5.46 2.41 1.35 3.60 2.07 0.07 0.42 0.04 70.68
      最小值 55.75 12.47 4.55 2.22 1.09 1.06 1.61 0.04 0.37 0.02 65.97
      平均值 59.10 13.49 5.15 2.31 1.21 1.69 1.86 0.06 0.41 0.03 67.56
      洛川黄土n=12 平均值 66.40 14.20 4.81 3.01 1.66 1.02 2.29 0.07 0.73 0.15 63.73
      洛川古土壤n=13 平均值 65.18 14.79 5.12 3.15 1.41 0.83 2.21 0.08 0.75 0.11 67.36
      镇江下蜀土n=54 平均值 68.07 13.32 5.30 2.35 0.92 1.00 1.61 0.09 0.81 0.18 70.45
      西峰红黏土n=5 平均值 63.75 15.05 5.28 3.00 1.16 0.90 2.89 0.08 0.76 0.15 69.11
      宣城风成红土n=64 平均值 68.77 13.71 6.52 1.38 0.14 0.11 0.54 0.04 1.06 0.06 87.55
      上陆壳(UCC) 平均值 66.00 15.20 5.00 3.40 3.90 4.20 2.20 0.06 0.50 0.50 47.92
      陆源页岩 平均值 62.80 18.90 7.22 3.70 1.20 1.30 2.20 0.11 0.16 1.00 70.36
      下载: 导出CSV
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