东北地区中、东部黄土成因初步研究

Research on the Formation Reason of Loess in Middle and Eastern Place in Northeast China

本文通过粒度分析法，分别对东北地区的中部和南部的黄土进行分析，结果表明，南部辽东半岛的黄土有两个物源：近地面西北季风吹来的滨海沉积物组成黄土中的粗粒组分；中纬度高空西风带来的中亚地区沉积物主要构成黄土中的细粒组分，且以近源搬运为主。中部长春的黄土则为河流洪积、冲积物原地风化而成，颗粒较细。本文对东北地区黄土的研究丰富了我国黄土类型的研究内容，同时为恢复东北地区第四纪环境提供了依据。

uatenary peiodchment in the northeaess in the northeast of china in this article not only enrich the loess reseach in oAbstract： This article analyzes the sediment of loess of the Quatenary in the central and southern parts of the northeast of china respectively with the method of granulometric analysis. The result shows that there are two original sources for the loess of the Liaoning peninsula： macro- grained contents formed by the coastal sediments brought by the near - ground monsoon; micrograined cgntents formed by the high - air mid - latitude westerlies. The loess in the central part is formed by pluvial and alluvial material that situ - weathered, and its particles are smaller. The research of the loess in the northeast of China in this article not only enrich the loess research in our country but also provides the basis for the restoration of the enrichment in the northeast of china in the Quatenary period.