A New Method of Determination of Loess Sequence Age with the Correlation between Sedimentation Rate and Grain Size

Liu Xiaodong; Lu Huayu; An Zhisheng

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......Δh_n and the time Δt₁,Δt₂......Δt_n,respectively,a system of equations can be established by proceeding. fi(Δt₁,Δt₂,......Δt_n-1,Δt_n,a,b)=0 i=1,2......n,n+1,n+2 in which Δt₁,Δt₂......Δt_n,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

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References

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A New Method of Determination of Loess Sequence Age with the Correlation between Sedimentation Rate and Grain Size

Abstract

References

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通讯作者: 陈斌, bchen63@163.com

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