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  

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

作　　者：杨丛宁 张戈[1,2] 刘思昭 刘晓 王恒伟[1] YANG Cong-ning;ZHANG Ge;LIU Si-zhao;LIU Xiao;WANG Heng-wei(College of Urban and Environmental Sciences,Liaoning Normal University,Dalian 116029,Liaoning Province,China;Dalian Natural History Museum,Dalian 116021,Liaoning Province,China;Heilongjiang University of Science and Technology,Harbin 150001,China)

机构地区：[1]辽宁师范大学城市与环境学院,辽宁大连116029 [2]黑龙江科技大学,黑龙江哈尔滨150001 [3]大连自然博物馆,辽宁大连116021

出　　处：《地质与资源》2018年第6期508-513,共6页Geology and Resources

基　　金：国家自然科学基金项目“辽宁大连骆驼山金远洞哺乳动物群及生物地层学的系统研究”(编号41772018)

摘　　要：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.The LS13320laser 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 of50.14%,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.

关 键 词：红黏土 洞穴堆积 更新世 粒度分析 频率累积曲线 沉积环境 辽宁省 

分 类 号：P512.2[天文地球—地质学] P588.2