大连金远洞更新世洞穴红色堆积物粒度特征及沉积环境分析

采用LS13320型的激光衍射粒度分析仪对金远洞洞穴堆积物进行粒度分析，所测得的数据用Grapher软件绘制堆积物粒度频率曲线，计算粒度参数，以此来研究金远洞更新世洞穴红色堆积物的粒度特征并推断沉积环境.金远洞洞穴堆积物粒度组成中，粉砂含量最高，为优势粒组，平均值为50.14%，其中细粉砂含量高于粗粉砂含量；黏粒含量次之，砂含量最少.样品粒度频率呈多峰态.通过粒度参数计算，推测洞穴红色堆积物的沉积环境以风力沉积为主，后经流水搬运，但堆积物的组成未发生明显变化，反映了搬运的水动力较弱.物质来源主要受气候的影响，环境干冷时以近源沉积为主，环境温暖湿润时以远源沉积为主.

ANALYSIS ON THE GRAIN SIZE CHARACTERISTICS AND SEDIMENTARY ENVIRONMENT OF THE PLEISTOCENE RED CAVE DEPOSITS IN JINYUANDONG,DALIAN

he LS13320 laser diffraction particle size analyzer is used to analyze the grain size of speleothem in Jinyuandong. The measured data are generated to grain size frequency curves by the Grapher software to calculate the parameters for the study of grain-size characteristics and sedimentary environment of the Pleistocene red cave deposits. The results show that the silt content dominates the size composition, with average value of 50.14%, among which the fine silt is more than coarse silt, followed by clay content, and the sand content is the least. The grain size frequency curves of sediment samples demonstrate multimodal. Based on the calculation of particle size parameters, it is inferred that the sedimentary environment is dominated by wind deposition, which is then transported by running water, yet the compositions of sediments haven't changed significantly, reflecting the weak hydrodynamic force. The material sources are mainly influenced by climate, mostly proximal deposit in dry-cold and far-source deposit in warm-humid environments.