摘要
本文根据普鲁以南的昆仑山北坡黄土的堆积、分布、颗粒特征和黄土的地层年代,认为该地黄土至少是末次冰期以来由风的地质作用形成的,其演化模式是向单一黄土方向发展的直线型。自末次冰期开始,本区所在的克里雅河流域的现今东北和西北风系就已建立,堆积黄土的风况没有明显的改变。
On the basis of the loess Stratigraphic investigation in the north piedmont of the Kunlun Mountains south of Pulu Village and the loessial grain size analysis and chronological data, the following opinions are put forward. The loess in tho investigation area and the eolian sands at the southern edge of the Taklimakan Desert have a relation of facies change and the loessial particles gradually become fine from north to south with the rising of the height. The loess was formed by wind geological action at least since the latest glaciat age. The loessial particlesvary within a narrow range vertically, their average grain diameter and standard deviations being respectively 4.46-5.08Φ and 0.74-1.18, suggesting that: (1) since the latest glacial age the loessial evolution in this area assumes a linear pattern characterized by development towards unitary loess; (2) at least in the beginning of the latest glacial age, the NE and NW wind systems, which now exist in the Keriya River where the area is located, had been already established and from that time on there has been no obvious wind regime change.
出处
《地质论评》
CAS
CSCD
北大核心
1989年第5期423-429,共7页
Geological Review
