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    泥河湾盆地基于粒度气候指标的轨道调谐时间标尺

    韩志勇 李徐生

    韩志勇, 李徐生, 2006. 泥河湾盆地基于粒度气候指标的轨道调谐时间标尺. 地球科学, 31(6): 773-779.
    引用本文: 韩志勇, 李徐生, 2006. 泥河湾盆地基于粒度气候指标的轨道调谐时间标尺. 地球科学, 31(6): 773-779.
    HAN Zhi-yong, LI Xu-sheng, 2006. Orbitally Tuned Time Scale Based on Climate Proxy Indicator of Grain Size Distribution in Nihewan Basin. Earth Science, 31(6): 773-779.
    Citation: HAN Zhi-yong, LI Xu-sheng, 2006. Orbitally Tuned Time Scale Based on Climate Proxy Indicator of Grain Size Distribution in Nihewan Basin. Earth Science, 31(6): 773-779.

    泥河湾盆地基于粒度气候指标的轨道调谐时间标尺

    基金项目: 

    国家自然科学基金项目 40401006

    中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金项目 SKLLQG0303

    详细信息
      作者简介:

      韩志勇(1968-),男,副教授,主要从事第四纪年代学研究.E-mail:zyhan@nju.edu.cn

    • 中图分类号: P532

    Orbitally Tuned Time Scale Based on Climate Proxy Indicator of Grain Size Distribution in Nihewan Basin

    • 摘要: 泥河湾盆地东部出露一套厚近百米的以湖相为主的地层.我们测量了洞沟剖面的粒度和磁化率.通过磁化率记录的对比, 我们可以将前人确定的古地磁界线转移到我们的深度坐标上来, 并建立了初步的时间标尺.样品中粒径在20~50μm之间的颗粒含量时间序列可以与ETP曲线对比, 即低含量对应高ETP值.这样的对比意味着在北半球夏季太阳辐射量相对增加的时期, 进入泥河湾盆地沉积物中的风尘物质减少了.这与已知的北方风尘的演化历史是吻合的, 所以我们认为粒度(20~50μm) 含量是泥河湾盆地沉积物中比较可靠的古气候变化的替代性指标.对于沉积速率相对高的时段, 即 > 780ka的地层, 我们尝试用轨道调谐的方法建立了高分辨率的时间标尺.新的粒度(20~50μm) 含量时间序列滤波获得的20ka和41ka的周期成分与岁差及地轴倾斜度的理论值可以重合.这显示洞沟剖面的粒度(20~50μm) 含量记录可以作为轨道调谐的气候曲线.

       

    • 图  1  洞沟剖面照片及其位置图

      照片右边为近水平的台地, 也就是剖面的顶部, 照片左边为剖面的底部; 镜头大致向西

      Fig.  1.  Location map and the photo showing Donggou Section

      图  2  洞沟剖面的粒度和磁化率的测量值随深度的变化曲线

      虚线指示剖面中砂层的位置; 古地磁极性柱是前人的研究结果(Zhu et al., 2001), 这里是根据磁化率曲线对比而确定其位置的(详见后文); 各段的沉积速率是按古地磁界线的年龄计算的

      Fig.  2.  Variation curve of grain (20-50 μm) content and magnetic susceptibility of Donggou Section

      图  3  本次研究获得的磁化率曲线(下图) 与前人的(上图) 的对比

      虚线指示主要的对比点; 箭头为洞沟剖面中主要的砂层的位置; 实线指示古地磁界线的位置

      Fig.  3.  Correlation of the magnetic susceptibility curve of Donggou Section (lower) with that obtained by another study (upper) (Zhu et al., 2001)

      图  4  洞沟剖面初步的粒度(20~50 μm) 含量时间序列与ETP曲线的对比

      黑色的条带指示古地磁界线; 三角指示49个对比点

      Fig.  4.  Correlation of the preliminary time series of Donggou grain (20-50 μm) content with ETP curve

      图  5  洞沟剖面轨道调谐时间标尺及滤波分析

      Fig.  5.  Orbitally tuned time scale of Donggou Section and filtered periods compared to calculated orbital parameter curves

      图  6  洞沟剖面粒度(20~50 μm) 含量时间序列与ETP曲线的交叉谱分析

      Fig.  6.  Cross spectral analysis between time series of Donggou grain (20-50 μm) content and ETP curve

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    • 收稿日期:  2006-05-12
    • 刊出日期:  2006-11-25

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