大连贺家圈黄土粒度所指示的物源特征

基于大连长兴岛的一套完整的晚更新世黄土剖面(贺家圈剖面),应用端元分析模型,对所采集的21个沉积样品的粒度数据进行分析。结论认为:从贺家圈剖面沉积物粒级组分中可以分离出3个代表不同沉积动力以及改造作用的沉积端元组分。并结合地球化学元素的对比分析,初步认为:端元1可能代表了剖面原始的粒度沉积组分,主峰为近源沉积,次峰为远源沉积;端元2可能代表了沉积物在沉积之后受到的淋溶作用和残积作用;端元3可能代表的是沉积物沉积之后受到的化学风化作用。

SOURCE CHARACTERISTICS INDICATED BY GRAIN SIZE OF LOESS IN HEJIAQUAN,DALIAN

Based on a complete late Pleistocene loess section(Hejiaquan section)in Changxing Island,Dalian,the grain size data of 21 sedimentary samples were analyzed by using the Endmember analysis.It is concluded that three end elements representing different sedimentary dynamics and transformation can be separated from the grain fractions of the sediments in the Hejiaquan section.Combined with the comparative analysis of geochemical elements,it is preliminarily considered that end element 1 may represent the original grain size sedimentary components of the profile,the main peak is near source deposition,and the secondary peak is far source deposition;end element 2 may represent the eluviation and eluviation of the sediment after deposition;end element 3 may represent the chemical weathering of the sediment after deposition.