Grain-Size Characteristics and Genesis of the Huangshan Loess in Songnen Plain Area
Wei Chuanyi
Li Changan
Kang Chunguo
Chang Guorui
Abstract：Huangshan Loess makes a typical example of Northeast China??s loess deposition,studying its genesis is the key to re-construction of both paleoclimate and paleoenvironment of Northeast China.A high resolution and systematic grain size analysis is carried out on “Huangshan Loess”in Harbin area,and the origin of “Huangshan Loess”is discussed in this paper in compar-ison with many other types of sediment including the modern dust deposition in Harbin area,the loess-palaeosol distributed over the Loess Plateau,the fluvial sediment and Qidingshan Loess in Dalian.The results show that:the 10 - 50 μm partial group is the “dominant group”of the “Huangshan Loess”whereas the content of <5 μm partials occupies 23.40%,which is more than the average content of >50 μm and 5-10 μm particals,corresponding with the composition characteristic of typical eolian loess;The grain-size frequency distribution presents even-number peak and each of these features of grain size parame-ters are characterized by the atmospheric dust,the average of theσ,SK ,KG ,Kd ,Mz ,Md is 1.83,0.21,0.86,2.01, 6.25φ,5.89φ,respectively;Clay-silt-sand triangular plots of “Huangshan Loess”indicate that it belongs to clayey silt.C-M , L-M ,A-M charts and statistical indices of grain size distribution share similarities with various aeolian sediments while obvi-ously differ from fluvial sediments.No one discriminant analysis results is of positive value,which confirms that the “Huangs-han Loess”is of the atmospheric sediment just like the aeolian origin of the loess-palaeosol in the Chinese plateau.
Keywords：Songnen Plain areaHuangshan Loessgrain size featureseolian originsediments
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1945-1954 )