别里库姆沙漠胡杨回涡沙丘表层沉积物粒度特征  

Grain Size Features of Surface Sediments from Populus Euphratica Echo Dunes in the Brikum Desert

作　　者：孔霄 来风兵[1,2] 陈蜀江 朱选[3] KONG Xiao;LAI Fengbing;CHEN Shujiang;ZHU Xuan(College of Geography and Tourism,Xinjiang Normal University,Urumqi,Xinjiang 830054,China;Institute of Space Remote Sensing Applications,Urumqi,Xinjiang830054,China;Monash University,Melbourne,Victoria3800,Australia)

机构地区：[1]新疆师范大学地理科学与旅游学院,新疆乌鲁木齐830054 [2]乌鲁木齐空间遥感应用研究所,新疆乌鲁木齐830054 [3]蒙纳士大学,维多利亚墨尔本3800

出　　处：《现代地质》2021年第3期657-664,共8页Geoscience

基　　金：新疆维吾尔自治区重点实验室开放课题基金项目(XJDX0909-2015-04);新疆师范大学“十三五”校级重点学科招标项目(17SDKD0702)。

摘　　要：胡杨回涡沙丘是别里库姆沙漠常见的一种风积地貌类型,通过测试分析来自6个样区胡杨回涡沙丘的195个表层沉积物样品,结合粒级-标准偏差法、Sahu成因判别和相关统计分析法,对其粒度特征进行研究,以分析别里库姆沙漠表层沉积物类型、沉积环境的稳定性。结果表明:(1)胡杨回涡沙丘表层沉积物粒度组成以砂和粉砂为主,从北向南、从东向西沉积物粒级均呈现变细趋势。(2)6个样区平均粒径的均值属于极细砂或细砂范围,71.79%的物质样品分选较好,97.94%的沉积物样品属于近对称分布,100%的物质样品属于中等峰态。(3)6个样区的粒级-标准偏差曲线均呈现多峰分布,沉积环境不稳定。(4)6个样区胡杨回涡沙丘表层沉积物的Sahu成因判别值介于-7.277~-5.912,均属于风成沉积。To determine the types of surface sediments,the sedimentary environment stability,and the surface wind power,we studied the surface grain size characteristics of the populus euphratica echo dunes,which were common in the Brikum Desert.About 195 surface sediment samples were collected from six sites,and analyzed via grain size-standard deviation,Sahu genetic discrimination,and the related statistical analysis methods.The results show that:(1)Grain size composition of the surface sediment samples is dominantly sand and silt,and the grain size decreases from north to south and from east to west;(2)Average grain sizes are in the range of very fine or fine sand.About 71.79%of the sediment samples were well sorted,and 97.94%of the samples are near-symmetrically distributed,and all the samples have a medium peak state;(3)Particle size-standard deviation curves of the six sampling sites all show a multi-peak distribution,indicative of an unstable deposition environment;(4)Discriminant values of the surface sediments from the six sites range from-7.277 to-5.912,suggestive of aeolian deposition products.

关 键 词：胡杨回涡沙丘 表层沉积物 粒度 别里库姆沙漠 

分 类 号：P66[天文地球—地质学] X141[环境科学与工程—环境科学]