摘要
根据巫山WPT1与WS3剖面共同体41个样品粒度测试结果，分析了巫山第四纪沉积物的粒度特征。结果表明：巫山第四纪沉积物主要由5～50μm粉砂组成，WPT1与WS3剖面平均占53．44％、65．37％，为众数粒组；〉50μm砂粒平均含量分别占0．79％、15．54％；〈5μm粘粒平均含量分别占45．78％、19．09％。样品频率分布曲线均为单峰态，与粒度参数具有较高的一致性特征。粒度分析初步表明，巫山第四纪沉积物是风成大气粉尘堆积物。
According to the grain-size analyses of 41 samples of Quaternary Deposit from WTP1 and WS3 sites in Wushan County,Chongqing City,the granular characteristics of Quaternary sediments in Wushan county is analyzed.The analysis results show that Quaternary sediments in Wushan County is mainly composed of 5~50 μm silty sand,the average percentage of the grain-size distribution accounts for 53.44%、65.37% respectively in WTP1 and WS3 sites,being the 'dominant group' of Quaternary Deposit in Wushan County;the average sand contents with granular size larger than 50 μm are 0.79% and 15.54% respectively,while average clay contents with granular size less than 5 μm are 45.78 and 19.09% respectively.The frequency distribution curve of samples is single-peak shape,possessing consistency with granular parameter.Granular size analysis preliminarily shows Quaternary deposits are Aeolian atmospheric dust sediment.
出处
《人民长江》
北大核心
2009年第13期13-15,共3页
Yangtze River
基金
西南大学博士基金资助(SWNUB2005039)
关键词
第四纪沉积物
粒度
成因
巫山
Quaternary deposit
grain-size
genesis
Wushan
