长江下游第四纪下蜀黄土的成因探讨

本文对长江下游下蜀黄土的代表性剖面,沉积物粒级、矿物及化学成分,沉积环境及成因特点、物质来源与区域对比等进行了较详细的论述,结论是下蜀黄土的形成以风力搬运为主,水流的作用参与居次要地位。

THE ORIGIN OF THE XIASHU LOESS IN THE LOWER REACHES OF THE YANGZI RIVER

Based on an analysis of the particle size, chemical composition, heavy minerals, sporo-pollen assemblage, SEM photos of quartz paricles and characteristics of their distribution and structures and textures at some sections of the Xiashu loess along the lower reaches of the Yangzi River, it has been realized that the formation of the Xiashu Ioess has gone through a very complicated process and this process of formation can not be explained by a simple pattern of wind-blown accumulation or watercoursed accumulation. But the wind-blown accumulation is a primary and master factor of all the factors. The watercoursed accumulation is the second and auxilliary factor. The Xiashu loess was carried from the northwestern region of China by the wind-blown process.