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The Reliability and Significance of the Grain-size Obtained by Mastersize 2000 Laser Analyzer:a case study on the typical S4 from Luochuan section
Author(s): 
Pages: 531-539
Year: Issue:  4
Journal: ACTA SEDIMENTOLOGICA SINICA

Keyword:  洛川黄土剖面S4粒度分析面积差异测量误差;
Abstract: 黄土、古土壤剖面中物质粒度是恢复古环境的重要指标之一.精确地测定粒径的大小,是准确而可靠获取气候变化信息的基本前提.通过对洛川典型黄土剖面古土壤S4及相临黄土层高密度、连续样品多次重复粒度测试结果经统计分析表明:粒径测量的误差主要来自于两方面,即仪器测量与前处理过程,其中前处理过程的影响是粒度测量中误差的主要来源.同时证明,单次测量结果具有不确定性,因此可靠的粒度参数需经多次测量平均获得.但是,此过程会导致某些快速变化信息的丢失和因峰态的平滑而造成粒度变化所反映的变化幅度弱化.
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