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合肥下蜀土地球化学特征及其古气候意义

路硕 尹功明 宋为娟 方良好 疏鹏 郑颖平

路硕, 尹功明, 宋为娟, 等, 2019. 合肥下蜀土地球化学特征及其古气候意义. 地质力学学报, 25 (3): 428-439. DOI: 10.12090/j.issn.1006-6616.2019.25.03.040
引用本文: 路硕, 尹功明, 宋为娟, 等, 2019. 合肥下蜀土地球化学特征及其古气候意义. 地质力学学报, 25 (3): 428-439. DOI: 10.12090/j.issn.1006-6616.2019.25.03.040
LU Shuo, YIN Gongming, SONG Weijuan, et al., 2019. GEOCHEMICAL CHARACTERISTICS AND PALEOCLIMATE IMPLICATIONS OF HEFEI XIASHU LOESS. Journal of Geomechanics, 25 (3): 428-439. DOI: 10.12090/j.issn.1006-6616.2019.25.03.040
Citation: LU Shuo, YIN Gongming, SONG Weijuan, et al., 2019. GEOCHEMICAL CHARACTERISTICS AND PALEOCLIMATE IMPLICATIONS OF HEFEI XIASHU LOESS. Journal of Geomechanics, 25 (3): 428-439. DOI: 10.12090/j.issn.1006-6616.2019.25.03.040

合肥下蜀土地球化学特征及其古气候意义

doi: 10.12090/j.issn.1006-6616.2019.25.03.040
基金项目: 安徽省合肥市政府项目"地震活断层探测及地震危险性分析"
详细信息
    作者简介:

    路硕(1988-), 女, 助理工程师, 硕士, 主要从事活动构造及沉积学方面研究。E-mail:15055141305@163.com

  • 中图分类号: P334.63;P595

GEOCHEMICAL CHARACTERISTICS AND PALEOCLIMATE IMPLICATIONS OF HEFEI XIASHU LOESS

  • 摘要: 合肥地处长江中下游北岸,下蜀黄土广泛分布,通过对合肥地区BK2钻孔剖面岩性、氧化物含量及其地球化学风化参数的分析,研究合肥地区风成沉积物地球化学元素特征及其气候变化规律。结果表明:野外钻孔岩芯剖面显示地层较好连续性,结合年龄数据划分了该孔的第四纪沉积框架,Qh底界为1.20 m,Qp3底界为5 m,5~35.10 m属Qp2中晚期地层;合肥下蜀土主要化学成分(SiO2+Al2O3+Fe2O3)的平均含量之和达88.99%,这种显著的富硅铝铁现象表明了该区气候较为湿润;化学风化程度较强,下蜀土的CIA平均值及其脱Ca、Na、K的程度均大于洛川黄土,说明其堆积期古气候比同期堆积的洛川气候温湿,较宣城干凉,与南京、镇江气候较为接近;近0.5 Ma以来总体经历由湿热-干冷的变化,大致可分为35~14.50 m、14.50~4.50 m、4.50~1.20 m和1.20~0 m四个阶段,气候变化由温暖湿润-温暖偏干-冷凉偏干-温暖湿润,显示了区内更新世中晚期以来的气候变迁具有全球一致性特征。

     

  • 图  1  BK2钻孔位置图

    Figure  1.  Location of the borehole BK2

    图  2  BK2钻孔柱状图

    Figure  2.  Histogram of the borehole BK2

    图  3  BK2钻孔剖面氧化物含量变化曲线

    Figure  3.  Varition curves of oxide content with depth in the borehole BK2 section

    图  4  合肥下蜀土A-CN-K化学风化趋势图

    Figure  4.  A-CN-K ternary diagram of the Xiashu loess in Hefei

    图  5  合肥下蜀土部分氧化物比值及风化参数随深度变化曲线

    Figure  5.  Variation curves of major oxide ratios and weathering parameters with depth of Hefei Xiashu loess

    图  6  CIA风化曲线与深海氧同位素曲线对比

    Figure  6.  Comparison of CIA weathering curves with deep sea oxygen isotope curves

    表  1  BK2钻孔剖面地层年代简表

    Table  1.   Dating of the borehole BK2 section

    野外编号 剖面深度/m 测试方法 年龄/ka
    BK2C 0.54 0.54 14C 2.708±0.059
    BK2C 1.10 1.10 14C 9.414±0.046
    BK2C1.50 1.50 ESR 26.89±1.17
    BK2C2.00 2.00 ESR 32.65±1.49
    BK25C3.80 3.80 ESR 58.68±2.87
    BK2C4.40 4.40 ESR 60.81±2.90
    BK2C5.60 5.60 ESR 195.23±12.08
    BK2C6.20 6.20 ESR 213.42±9.92
    BK2C8.20 8.20 ESR 264.45±13.14
    BK2C8.60 8.60 ESR 312.84±14.12
    BK2C9.50 9.50 ESR 307.23±14.61
    BK2C11.60 11.60 ESR 352.48±34.64
    BK2C19.20 19.20 ESR 447.27±21.70
    BK2C20.10 20.10 ESR 455.27±21.02
    BK2C24.50 24.50 ESR 466.12±24.37
    BK2C28.20 28.20 ESR 459.28±22.05
    BK2C30.00 30.00 ESR 445.35±20.83
    BK2C33.40 33.40 ESR 486.62±26.83
    BK2C34.60 34.60 ESR 484.37±23.81
    下载: 导出CSV

    表  2  BK2钻孔剖面样品氧化物含量

    Table  2.   Oxide content in samples from the borehole BK2 section

    样品深度/m SiO2 Al2O3 Fe2O3 K2O Na2O MgO TiO2 CaO P2O5 MnO CIA
    0.60 72.33 13.63 3.66 2.44 1.59 1.24 1.12 0.49 0.08 0.02 75.10
    1.75 67.51 14.27 5.05 2.74 1.52 1.45 1.11 0.65 0.13 0.04 74.40
    2.55 69.11 14.12 4.38 2.68 1.45 1.33 1.16 0.63 0.09 0.04 74.79
    3.35 71.04 13.42 3.85 2.51 1.80 1.36 1.18 0.66 0.15 0.03 72.97
    4.15 70.44 12.87 5.21 2.25 1.20 0.82 1.21 0.46 0.12 0.02 76.70
    4.85 65.10 16.43 5.61 2.93 1.26 1.70 1.11 0.58 0.11 0.03 77.50
    5.75 67.60 15.05 4.67 2.93 1.36 1.62 1.21 0.62 0.11 0.10 75.40
    6.55 73.52 12.64 4.25 2.34 1.37 0.93 1.28 0.43 0.22 0.03 75.33
    7.35 65.99 15.86 5.52 2.77 1.19 1.53 1.22 0.56 0.14 0.14 77.82
    8.15 68.14 14.71 5.16 2.74 1.43 1.56 1.20 0.57 0.11 0.06 75.63
    8.95 67.42 15.28 5.27 2.69 1.19 1.45 1.19 0.48 0.13 0.13 77.80
    9.75 69.67 13.70 5.36 2.30 1.18 1.16 1.20 0.43 0.15 0.04 77.80
    10.55 65.26 17.02 5.17 2.76 1.13 1.15 1.33 0.22 0.20 0.02 80.55
    11.35 65.40 15.54 6.00 2.86 1.40 1.38 1.19 0.27 0.23 0.19 77.43
    12.15 75.62 10.91 5.31 1.75 0.96 0.75 1.40 0.20 0.26 0.02 78.94
    12.95 68.78 14.93 4.97 2.59 1.09 1.09 1.27 0.25 0.14 0.02 79.16
    13.75 73.39 13.42 4.04 2.14 0.80 0.84 1.35 0.26 0.13 0.02 80.75
    14.55 68.90 15.48 4.60 2.21 0.88 0.91 1.24 0.31 0.15 0.06 81.99
    15.35 63.34 17.66 6.07 3.27 1.52 1.57 1.14 0.16 0.26 0.05 78.11
    16.15 65.62 15.06 5.32 3.02 1.50 1.37 1.25 0.26 0.26 0.11 75.91
    17.10 74.10 13.16 3.48 2.41 1.15 0.80 1.44 0.22 0.16 0.04 77.69
    18.00 71.25 13.55 3.93 2.44 1.15 0.78 1.41 0.22 0.17 0.06 78.05
    18.70 72.40 13.67 4.11 2.26 1.24 0.88 1.39 0.25 0.16 0.03 78.47
    19.60 68.84 14.29 4.38 2.93 1.42 1.24 1.28 0.29 0.19 0.06 75.49
    20.35 72.33 13.02 4.29 2.54 0.86 0.91 1.23 0.44 0.10 0.16 77.22
    21.25 69.61 14.41 4.57 2.62 0.60 0.91 1.29 0.37 0.12 0.12 80.06
    22.05 78.55 10.19 2.58 1.90 0.59 0.59 1.50 0.34 0.07 0.07 78.26
    22.85 75.32 11.43 4.08 1.69 0.46 0.68 1.42 0.37 0.11 0.12 81.94
    23.65 77.34 11.07 2.99 1.58 0.33 0.62 1.52 0.34 0.09 0.03 83.11
    24.45 62.89 17.43 5.72 2.51 0.50 1.19 1.17 0.49 0.13 0.04 83.28
    25.25 72.37 13.01 3.86 2.58 0.74 0.88 1.36 0.40 0.10 0.07 77.76
    26.05 72.30 13.35 3.94 2.47 0.63 1.04 1.29 0.37 0.11 0.02 79.37
    26.85 77.04 10.57 3.40 1.64 0.44 0.72 1.63 0.33 0.12 0.02 81.43
    27.65 78.73 9.82 3.39 1.09 0.44 0.55 1.63 0.34 0.12 0.02 84.00
    28.35 70.74 12.87 4.79 1.82 0.55 0.82 1.37 0.40 0.14 0.09 82.29
    29.05 73.83 11.57 3.83 1.80 0.82 0.82 1.37 0.45 0.12 0.02 79.03
    29.85 77.78 10.53 2.87 1.87 0.70 0.75 1.50 0.39 0.08 0.02 78.06
    30.65 77.88 10.04 3.30 1.13 0.58 0.57 1.46 0.39 0.09 0.05 82.70
    31.45 69.54 13.92 4.38 2.09 1.11 1.08 1.25 0.40 0.11 0.04 79.45
    32.25 67.54 15.08 4.76 2.25 0.99 1.21 1.14 0.60 0.09 0.31 79.70
    33.05 74.08 11.99 3.84 1.64 0.84 0.77 1.40 0.53 0.12 0.20 79.93
    33.85 75.00 11.03 4.01 1.22 0.55 0.65 1.59 0.39 0.13 0.27 83.62
    注:氧化物含量%(除CIA)
    下载: 导出CSV

    表  3  合肥BK2剖面氧化物平均含量与其他风成沉积物的比较

    Table  3.   The average oxide content of the borehole BK2 section in comparison with that of other meolian dust deposits

    地点 SiO2 Al2O3 Fe2O3 K2O Na2O MgO TiO2 CaO P2O5 MnO CIA
    洛川黄土 66.40 14.20 4.81 3.01 1.66 2.29 0.73 1.02 0.15 0.07 63.73
    合肥下蜀土 71.04 13.52 4.43 2.29 1.01 1.04 1.31 0.40 0.14 0.07 78.48
    南京下蜀土 63.61 15.40 5.67 2.23 0.97 1.44 0.82 0.87 0.28 0.13 73.70
    镇江下蜀黄土 68.07 13.32 5.30 2.35 0.92 1.61 0.81 1.00 0.18 0.09 70.45
    宣城下蜀土 69.08 13.71 6.24 1.36 0.14 0.54 1.01 0.11 0.06 0.04 89.49
    注:单位%(除CIA)
    下载: 导出CSV
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  • 收稿日期:  2018-06-07
  • 修回日期:  2019-01-17
  • 刊出日期:  2019-06-28

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