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    中国黄土10Be记录中的古地磁场变化

    杜雅娟 周卫健 鲜锋 孔祥辉 康志海

    杜雅娟, 周卫健, 鲜锋, 孔祥辉, 康志海, 2013. 中国黄土10Be记录中的古地磁场变化. 地球科学, 38(3): 482-488. doi: 10.3799/dqkx.2013.048
    引用本文: 杜雅娟, 周卫健, 鲜锋, 孔祥辉, 康志海, 2013. 中国黄土10Be记录中的古地磁场变化. 地球科学, 38(3): 482-488. doi: 10.3799/dqkx.2013.048
    DU Ya-juan, ZHOU Wei-jian, XIAN Feng, KONG Xiang-hui, KANG Zhi-hai, 2013. The Paleogeomagnetic Intensity Variation from 10Be Record in Chinese Loess. Earth Science, 38(3): 482-488. doi: 10.3799/dqkx.2013.048
    Citation: DU Ya-juan, ZHOU Wei-jian, XIAN Feng, KONG Xiang-hui, KANG Zhi-hai, 2013. The Paleogeomagnetic Intensity Variation from 10Be Record in Chinese Loess. Earth Science, 38(3): 482-488. doi: 10.3799/dqkx.2013.048

    中国黄土10Be记录中的古地磁场变化

    doi: 10.3799/dqkx.2013.048
    基金项目: 

    国家自然科学基金项目 41023006

    国家重点基础研究发展计划项目 2010CB833405

    黄土与第四纪地质国家重点实验室自主部署项目 LQ0704

    详细信息
      作者简介:

      杜雅娟(1982-), 女, 助理工程师, 主要从事地质数据分析.E-mail: duyj@ieecas.cn

    • 中图分类号: P595;P318.4

    The Paleogeomagnetic Intensity Variation from 10Be Record in Chinese Loess

    • 摘要: 因受气候因素的强烈影响, 中国黄土10Be记录无法直接用于示踪地磁场变化, 需开展信号分离研究.针对黄土10Be示踪古地磁场的复杂性和存在的关键问题, 结合分离黄土10Be浓度所包含的气候因素和地磁场因素的数理分析方法发展历史, 分析了各种方法的优缺点.在原有方法的基础上, 引入主成分分析法对洛川和西峰2个黄土剖面的10Be记录进行主成分提取, 进一步剔除了残差中可能存在的少量气候因素、噪声等随机信号, 定量重建了130 ka以来的大气10Be产率, 与以往方法相比较取得了更优的结果.将主成分分析应用于复杂地质信号的分离, 将有助于解决地质或其他信号分离的难题.

       

    • 图  1  130 ka以来洛川(a、b)和西峰(c、d)剖面10Be浓度和黄土磁化率高度相似

      a.洛川剖面黄土磁化率及10Be浓度;b.洛川剖面10Be浓度与磁化率高度线性相关;c.西峰剖面黄土磁化率及10Be浓度;d.西峰剖面10Be浓度与磁化率高度线性相关

      Fig.  1.  High similarity between 10Be concentration and magnetic susceptibility from Luochuan and Xifeng sections in the past 130 ka

      图  2  130 ka以来洛川黄土10Be记录的古地磁场漂移事件序列对比

      a.LGM法重建相对产率结果;b.恒定值法重建相对产率结果;c.平均值法重建相对产率结果;d.气候修正因子法重建相对产率结果

      Fig.  2.  Comparison of sequence about the past 130 ka reconstructed paleogeomagnetic field from loess 10Be record of Luochuan

      图  3  方案A主成分分析第1、2主成分对应的时间序列

      Fig.  3.  Time series of the 1st, 2nd principal component of method A

      图  4  方案B主成分分析第1、2主成分对应的时间序列

      Fig.  4.  Time series of the 1st, 2nd principal component of method B

      图  5  主成分分析、恒定值及气候修正因子重建10Be产率结果对比

      a.主成分分析黄土10Be相对产率;b.恒定值法黄土10Be相对产率;c.气候修正因子法黄土10Be相对产率

      Fig.  5.  Comparison of sequence about the past 130 ka reconstructed production rate from loess 10Be record by using PCA, uniform distribution method and MVC-scaling method

      图  6  130 ka以来洛川和西峰黄土10Be重建的地磁场强度变化序列与全球不同区域记录的综合对比

      a.主成分分析黄土10Be重建结果;b.北太平洋海洋沉积物地磁场曲线;c.SINT-2000地磁场曲线

      Fig.  6.  Comparison of sequence about the past 130 ka reconstructed paleogeomagnetic intensity from loess 10Be record of Luochuan and Xifeng in China and record of global area

      表  1  文中符号定义

      Table  1.   Nomenclature

      符号 说明
      [10Be]m 黄土测量10Be浓度
      [10Be]D 10Be浓度粉尘组分
      [10Be]p 10Be浓度降雨组分
      SUSm 黄土磁化率测量值
      SUSD 尘降磁化率估计值
      SUSP 成壤磁化率
      ΦD 粉尘通量
      Pr 10Be产率
      下载: 导出CSV
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    • 收稿日期:  2012-04-05
    • 刊出日期:  2013-05-15

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