塔里木河干流古河道表层沉积物粒度特征及其意义/Grain Size Characteristics and Their Significance for Surface Sediment of Paleochannels Along Main Stream of Tarim River[J]

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Publication date
1 January 2012
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Abstract

历史上塔里木河因频繁改道在干流两岸遗留了多条古河道,研究其表层沉积物粒度特征,可判断表层沉积物形成时的沉积环境与水动力条件。通过对塔里木河古河道表层沉积物系统采样,进行粒度分析发现：（1）塔里木河古河道表层沉积物优势粒级为粉沙,粒度次一级组分在干流两岸古河道间差异明显;（2）古河道表层沉积物比塔里木河洪泛平原土壤粒径细小,表明古河道晚期水动力较弱;（3）塔里木河干流南岸的部分古河道表层沉积物中,含风成沙夹层,反映了其沉积环境受风水两相作用

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