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

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^{1, 2,},
李徐生¹

1.
南京大学城市与资源学系江苏南京 210093
2.
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, 陕西西安 710075

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
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- 被引次数: 0
出版历程
- 收稿日期: 2006-05-12
- 刊出日期: 2006-11-25

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

HAN Zhi-yong^{1, 2
,},
LI Xu-sheng¹

1.
Department of Urban and Resources Sciences, Nanjing University, Nanjing 210093, China
2.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, Cbina

摘要

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.
- 泥河湾 /
- 洞沟剖面 /
- 粒度 /
- 时间序列 /
- 轨道调谐
Abstract: The Donggou Section located in the east of Nihewan basin contains a suite of strata consisted mainly of lacustrine sediments approximate to 100 m thick. Both grain size distribution and magnetic susceptibility are measured in successive samples collected from this section. A preliminary time scale can be derived, based on the comparison between records of magnetic susceptibility, from the geomagnetic polarity reversals determined by previous studies. In this study, the grain (20-50 μm) content record of Donggou Section can be correlated to the ETP curve. The low value of the former is compared with the high value of the latter. This negative correlation implies that the dust inputs into sediments in the Nihewan basin decreases while the solar radiation on the north hemisphere increases. This scenario is compatible with the known evolution of the aeolian activity in North China. Therefore, the grain (20-50 μm) content is a reliable proxy indicator of the paleoclimate change. Orbital tuning method is performed and a time scale of high resolution is obtained for the strata older than > 780 ka since the sedimentation rate here is relatively high. The 20 ka and 41 ka periodic components filtered from the obtained grain (20-50 μm) content time series are consistent with the theoretic cycles of the precession and the tilt, respectively, indicating that the grain (20-50 μm) content record of Donggou Section can be used as the climatic curve for orbital tuning.
- Nihewan /
- Donggou Section /
- grain size /
- time series /
- orbital tuning.

HTML全文

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

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

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)

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

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

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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

下载: 全尺寸图片幻灯片

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