利用黄土沉积速率与粒度的相关性建立黄土序列年龄的新方法
- 1. 中国科学院兰州高原大气物理研究所,兰州 730000;
- 2. 中国科学院黄土与第四纪地质国家重点实验室,西安 710054
基金项目:
中国科学院“九五”重大研究项目“亚洲季风变迁与全球变化”及国家攀登项目(95-预-40)资助
作者简介:
刘晓东，男，34岁，研究员，从事气候变化与气候模拟研究。
- 收稿日期:
1997-11-19
- 修回日期:
1998-06-03
- 刊出日期:
1999-03-10
摘要: 基于黄土沉积速率与粒度的相关性提出了一种通过求解代数方程组而确定黄土地层年龄的新方法。以洛川剖面为例，用该方法确定了其Ｓｌ顶部至Ｓ２底部深度－年龄的转换关系，与ＳＰＥＣＭＡＰ高分辨率的深海氧同位素记录的对比表明了该方法在确定黄土序列年龄上的有效性。
A New Method of Determination of Loess Sequence Age with the Correlation between Sedimentation Rate and Grain Size
- 1. Lanzhou Institute of plateau Atmospheric Physics,Chinese Academy of Sciences,Lanzhou 730000;
- 2. State Key Laboratory of Loess and Quaternary Geology,Chinese Academy of Sciences,Xi'an 710054
- Received Date:
1997-11-19
- Rev Recd Date:
1998-06-03
- Publish Date:
1999-03-10
Abstract: On the basis of linear correlation between loess sedimentation rate and grain size,a new method of establishment of loess sequence age was developed. In this method, we assume that there is a linear relationship between the loess sedimentation rate R and the grain size S at the same horizon in a loess sequence,that is, S=aR+b,where a and b are coefficients awaiting determination. Supposing that the loess between two time control points is divided into n layers.the depths of which are indicated by Δh1,Δh2......Δhn and the time Δt1,Δt2......Δtn,respectively,a system of equations can be established by proceeding. fi(Δt1,Δt2,......Δtn-1,Δtn,a,b)=0 i=1,2......n,n+1,n+2 in which Δt1,Δt2......Δtn,a and b are unknown numbers. As this is a system of special nonlinear algebraic equations,which consists of n+2 equations,its numerical solution will be obtained with a iteration method.In this way,we can carry out a transformation from depth to age for a loess sequence. As an example,the depth-age transformation in the Luochuan loess section
刘晓东, 鹿化煜, 安芷生. 利用黄土沉积速率与粒度的相关性建立黄土序列年龄的新方法[J]. 沉积学报, 1999, 17(1): 145-148.
| 引用本文: |
刘晓东, 鹿化煜, 安芷生. 利用黄土沉积速率与粒度的相关性建立黄土序列年龄的新方法[J]. 沉积学报, 1999, 17(1): 145-148.
|
Liu Xiaodong, Lu Huayu, An Zhisheng. A New Method of Determination of Loess Sequence Age with the Correlation between Sedimentation Rate and Grain Size[J]. Acta Sedimentologica Sinica, 1999, 17(1): 145-148.
| Citation: |
Liu Xiaodong, Lu Huayu, An Zhisheng. A New Method of Determination of Loess Sequence Age with the Correlation between Sedimentation Rate and Grain Size[J]. Acta Sedimentologica Sinica, 1999, 17(1): 145-148.
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