阿尔泰山古风化壳的粒度组成

通过对“阿尔泰山古风化壳”课题的样品粒度分析,表明在不同剖面上古风化壳的粒度组成及土体化学各粒级含量及各类元素在不同母岩风化剖面上的迁移聚集趋势,并结合粘土矿物的分析说明风化壳形成过程中淋溶作用的强弱程度,确定其不同岩性。

SIZE COMPOSTION OF THE PALAEOREGOLITH IN THE ALTAY MOUNTAINS

The palaeoregolith develops widespreadly from the western section of the Altay Mountain within China to Qinghe County of Altay Prefecture eastward. The deep regolith in the Altay Mountains is the result of the palaeoclimate. The regolith can be roughly classified into two types, relict regolith and transported regolith, based on the study results of the subject on the "Palaeoregolith in the Altay Mountains" and the granularmetric analysis results of the samples. The relict regolith is eroded by surface water and a part of its solubles is transported away by groundwater during and after its formation. A part of the weathered materials is eroded and transported by rivers to deposit at plains or enter seas, and a part of which is deposited in basins or low lands and forms the red accumulations after transported by rivers for a short distance. The action of surface water makes the coarse materials and quartz sand deposit earller than the fine materials, which brings about a high content of SiO2 and a large ratio value of cilicon-aluminium in the surface layer. It shows that the regolith belongs to the relict type at the lower part of the sections.Accumulational regolith often connects with the relict regolith, it is accumulated by the weathered materials which are eluviated and transported for a short distance during the formation of the relict regolith. It is characterized by the mixableness and poor sorting in size, and there is no any law for the analysis data. The chemical property is the high contents of salt and alkali metal as well as the high anion and cation, which corresponds with the characteristic of the mixableness.