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    "巫山黄土"的磁组构特征及成因

    张玉芬 李长安 邵磊 罗昊 蒋维杰 牛志军 赵小明 涂兵

    张玉芬, 李长安, 邵磊, 罗昊, 蒋维杰, 牛志军, 赵小明, 涂兵, 2010. '巫山黄土'的磁组构特征及成因. 地球科学, 35(5): 885-890. doi: 10.3799/dqkx.2010.103
    引用本文: 张玉芬, 李长安, 邵磊, 罗昊, 蒋维杰, 牛志军, 赵小明, 涂兵, 2010. "巫山黄土"的磁组构特征及成因. 地球科学, 35(5): 885-890. doi: 10.3799/dqkx.2010.103
    ZHANG Yu-fen, LI Chang-an, SHAO Lei, LUO Hao, JIANG Wei-jie, NIU Zhi-jun, ZHAO Xiao-ming, TU Bing, 2010. Magnetic Fabric Characteristics and Implications for Its Origin of 'Wushan Loess'. Earth Science, 35(5): 885-890. doi: 10.3799/dqkx.2010.103
    Citation: ZHANG Yu-fen, LI Chang-an, SHAO Lei, LUO Hao, JIANG Wei-jie, NIU Zhi-jun, ZHAO Xiao-ming, TU Bing, 2010. Magnetic Fabric Characteristics and Implications for Its Origin of "Wushan Loess". Earth Science, 35(5): 885-890. doi: 10.3799/dqkx.2010.103

    "巫山黄土"的磁组构特征及成因

    doi: 10.3799/dqkx.2010.103
    基金项目: 

    国家自然科学基金项目 40771213

    国家自然科学基金项目 40971008

    中国地质调查局项目 1212010814057

    详细信息
      作者简介:

      张玉芬(1957-), 女, 博士, 教授, 主要从事环境地球物理等方面的教学与研究.E-mail: zhyfcug@163.com

    • 中图分类号: P642

    Magnetic Fabric Characteristics and Implications for Its Origin of "Wushan Loess"

    • 摘要: 为了探讨"巫山黄土"的成因类型, 对新近发现的"巫山黄土"进行了磁组构测试和磁化率主轴特征分析, 并与长江现代沉积物以及长江中游一带分布的风积黄土和"砂山"的磁组构特征进行了对比.结果表明: (1)"巫山黄土"的κPFLE值与风积黄土和"砂山"接近, 却明显低于长江现代沉积物的相应值; (2)在磁组构参数F-L关系图上, "巫山黄土"的数据点多集中于坐标原点附近, 与长江中游一带风积黄土和"砂山"的特征也类似, 均指示了沉积动力相对比较弱的沉积环境.而长江现代河流沉积物的数据点却主要分布于F轴附近, 反映长江现代河流沉积物的FL发育; (3)"巫山黄土"的磁化率最大主轴特点也与长江中游风积黄土和"砂山"的接近, 偏角的方向比较分散, 长轴的倾角为36°~38°, 短轴的倾角为37°~39°, 而长江现代河流沉积物的磁化率最大主轴偏角的方向比较稳定, 并且长轴的倾角一般小于10°, 短轴的倾角大于80°; (4)"巫山黄土"样品的T值介于-1~1之间, 而长江现代河流沉积物的T值却主要以大于1为主.综合看来, "巫山黄土"的磁组构特征与长江中游一带的风积黄土和"砂山"接近, 指示了其风积成因的特点.

       

    • 图  1  研究剖面位置

      Fig.  1.  Map showing the geography and section position of the research area

      图  2  长江中游部分沉积物磁组构参数

      a.长江现代河漫滩沉积(张玉芬等,2008);b.武汉青山风成黄土(下蜀黄土);c.文中“巫山黄土”;图中n是样品数

      Fig.  2.  Combination diagrams of magnetic fabric parameters of sediments in the Middle reach of Yangtze River

      图  3  不同沉积类型的AMS主轴等面积赤平投影

      a.武汉长江河漫滩(n=305);b.武汉青山风成砂(n=313);c.本文研究的“巫山黄土”(n=146);●.κmax;▲.κint;+.κmin

      Fig.  3.  Stereographic projection of anisotropy of magnetic susceptibility ellipsoids of some sediment types

      表  1  不同沉积类型的磁组构参数

      Table  1.   Magnetic fabric analysis parameters of different deposit types

      沉积类型与 沉积环境 采样地点 样品数 к(10-6SI) P F L q T E Imax(°) Imin(°)
      水成沉积 河流 现代河流 长江宜昌 34 2 009.1 1.027 6 1.022 5 1.005 1 0.225 5 0.608 4 1.017 3 8.50 74.7
      长江輝洲湾 305 1 538.7 1.046 0 1.038 1 1.007 6 0.257 0 0.593 0 1.030 3 9.50 74.3
      长江武汉 47 1 403.3 1.039 2 1.036 4 1.002 7 0.121 9 0.821 6 1.033 6 5.80 80.5
      汉江仙桃 66 708.2 1.072 9 1.062 9 1.009 5 0.167 9 0.716 2 1.052 9 7.70 80.6
      髙位碌石层 李家院砾石层 8 1 504.3 1.024 4 1.016 9 1.007 3 0.347 1 0.406 1 1.009 4 9.30 71.4
      白洋渡砾石层 26 355.0 1.025 5 1.021 1 1.004 3 0,202 8 0.644 9 1.016 7 6.00 80.1
      溃口扇 长江輝洲湾 307 782.2 1.041 2 1.028 1 1.010 3 0.400 1 0.361 6 1.015 3 17.90 68.4
      风成沉积 风尘砂 武汉青山 312 657.0 1.016 4 1.010 7 1.005 7 0.535 6 0.214 2 1.005 0 21.30 55.9
      岳阳君山 53 106.0 1.006 1 1.003 0 1.003 1 0.739 7 0.012 0 0.999 8 29.00 42.0
      江西新港 430 38.5 1.028 6 1.015 5 1.012 9 0.628 5 0.097 8 1.002 7 24.20 45.1
      风尘黄土 武汉青山 48 750.0 1.008 6 1.005 0 1.003 5 0.653 0 0.091 1 1.001 6 22.00 54.0
      江西新港 116 161.4 1.015 9 1.008 9 1,006 9 0.589 1 0.155 0 1.003 0 16.00 54.2
      本文研究的“巫山黄土” 146 361.4 1.007 3 1.004 0 1.003 4 0.672 1 0.049 9 1.000 4 37.34 38.0
      注:参数κ.平均磁化率(总磁化率) ;P.各向异性度;F.磁面理;L磁线理;q.磁基质颗粒度;T形状因子;E.扁率;ImaxImin分别为最大、最小主轴的倾角.
      下载: 导出CSV
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