关中东部渭河右岸晚更新世以来黄土的粒度特征与物源分析  

The Grain Size Characteristics and Source of Loess Since Late Pleistocene in the Guanzhong Eastern Weihe on the Right Bank

作　　者：苏英[1] 张炜[2] 刘俊峰 张继文[2] 

机构地区：[1]咸阳师范学院旅游与资源环境学院,咸阳712000 [2]机械工业勘察设计研究院,西安710043 [3]咸阳建筑设计研究院,咸阳712000

出　　处：《科学技术与工程》2013年第27期7941-7946,共6页Science Technology and Engineering

基　　金：陕西省重点学科专项资金建设项目(10722;60103);陕西省教育厅自然科学专项基金项目(09JK804)资助

摘　　要：为了探究关中东部渭河右岸晚更新世以来黄土在粒度、厚度、湿陷性等方面与渭北及关中其他地区存在显著差异的原因,在研究区从东向西选择2条近南北向断面共6个黄土剖面,对黄土地层进行野外实际观察;并采集样品380件进行室内粒度分析。研究结果显示从东向西、由北向南,黄土地层厚度逐渐变小,黄土粒度组成上砂粒含量减少,粘粒含量增加。说明区域黄土是由近源粉砂(东偏北风搬运)与远源粉尘(西北风搬运)共同堆积的产物。For researching into the reason of significant difference between the Loess＇ s grain size, thickness and settlement by soaking since late Pleistocene in the Guanzhong Eastern Weihe on the right bank and area to the north of Wei river and the rest of Guanzhong area, 6 loess profiles is selected from east to west in the 2 near north-south direction section to do the real observation of loess stratigraphy, and collect 380 samples to do the grain size analysis. The research result demonstrated that from east to west, north to south, the loess stratigraphy thichkness taper off gradually, the sand content of the loess grain size decrease gradually, clay particle decrease gradually. It proves that the loess is accumulated by the near source mealy sand （northeast wind transports） and far source bug dust （ northwest wind transports）.

关 键 词：黄土 厚度 粒度 物源 关中东部 

分 类 号：P534.63[天文地球—第四纪地质学]