影响沉积物粒度测量结果的多因素分析

Multifactors Analysis of Influencing Sediment Particle-size Measurement Results

为了分析沉积物粒度测量结果的影响因素,采用不同的前处理方法以及两种激光粒度分析仪器分析了采自金沙江某考古遗址处的样品,结果表明:(1)富含有机质及碳酸盐成分的深层样品在加入HCl处理后,粒度测量结果偏粗;有机质含量较少的浅层样品经加热处理后粒度偏粗。(2)对同一样品,贝克曼-库尔特激光粒度分析仪对含量相对较少的细颗粒组分更敏感,马尔文激光粒度分析仪对粗颗粒组分的检测效果更好。因此,针对不同沉积环境的样品,应需要采取不同的前处理方法,将所使用的数据建立在同一测量系统内,以期获得更准确的古环境信息。

In order to analyze the influencing factors of sediment particle-size measurement results,different pre-treatment methods and two laser particle-size analysis instruments were used to analyze samples collected from the archaeological site of Jinsha River.The results showed that:(1)The deep samples,which are rich in organic matter and carbonate,have coarser particle size measurement results after the addition of HCl.For shallow samples with less organic matter content,the particle-size is coarser after heating treatment.(2)For the same sample,the Beckman-Coulter laser particle-size analyzer is more sensitive to the relatively small amounts of fine particles,and the Malvern laser particle-size analyzer is more effective in detecting the coarse particles.Therefore,for samples from different depositional environments,different pre-treatment methods may be required,and the data should be established within the same measurement system in order to obtain more accurate paleoenvironment information.